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Masaru Kikuchi
Faculty of Engineering　Division of Architecture　Research Group of Structural Engineering and Materials
Professor
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Last Updated :2024/05/09

Researcher Profile and Settings

Affiliation

  • Faculty of Engineering　Division of Architecture　Research Group of Structural Engineering and Materials

Job Title

  • Professor

Degree

  • Doctor of Engineering（Hokkaido University）

URL

Research funding number

  • 50344479

J-Global ID

Research Interests

  • 建築構造学   

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Building structures and materials

Educational Organization

Academic & Professional Experience

  • 2007 - 2009 北海道大学准教授（工学研究科建築都市空間デザイン専攻） 准教授
  • 2009 - 北海道大学教授（工学研究院建築都市空間デザイン部門） 教授
  • 2009 - Professor
  • 2002 - 2005 北海道大学助教授（工学研究科社会基盤工学専攻） 助教授
  • 2002 - 2005 Associate Professor
  • 1986 - 2002 清水建設株式会社 職員（技術系）
  • 1986 - 2002 Technical Staff,Shimizu Corporation

Education

  • 1984/04 - 1986/03  Hokkaido University
  • 1980/04 - 1984/03  Hokkaido University  School of Engineering

Association Memberships

  • Earthquake Engineering Research Institute   日本原子力学会   日本地震工学会   日本免震構造協会   日本建築学会   

Research Activities

Published Papers

  • Kou Miyamoto, Jun Iba, Koichi Watanabe, Ken Ishii, Masaru Kikuchi
    Structural Control and Health Monitoring 2023 1 - 24 1545-2255 2023/03/23 
    Seismic isolation is widely used in several countries, and the number of seismically isolated buildings has increased rapidly in recent decades. Seismic isolation extends the natural period of a building to decrease the absolute acceleration and seismic force. As there is a trade-off between the absolute acceleration and displacement, a soft layer results in a large displacement for a large seismic wave, but the hard one causes the large absolute acceleration even for a small seismic wave. The restoring force of a Duffing spring is given by the third and first orders of the displacement. This spring has been applied to protect a building from large earthquake waves. However, the influence of the coefficient of the Duffing spring that determines the dynamic characteristics of the system has not been clarified. Thus, a used Duffing spring may not be appropriate for seismic resistance. Moreover, most studies are based on analytical methods, and the advantages of the Duffing isolation have not been verified in an actual system. To address these problems, this paper reveals the influence of the coefficient of the Duffing spring on structural responses to seismic waves. Moreover, this paper devised a way to implement a Duffing spring for seismic isolation and carried out experiments to verify the validity in actual systems. The experimental results presented that the Duffing spring was effective in protecting a building in actual systems.
  • 硬化型復元力と回転慣性質量を組み合わせた実大変位スケールの変位抑制型免震構造に関する研究
    射場 淳, 渡辺 宏一, 宮本 皓, 石井 建, 菊地 優
    日本建築学会構造系論文集 88 (805) 426 - 436 2023/03 [Refereed][Not invited]
  • 鉛入り積層ゴムの熱・力学的連成挙動を考慮した免震建物の地震時応答評価に関する研究
    近藤 明洋, 菊地 優
    日本建築学会構造系論文集 88 (804) 211 - 222 2023/03 [Refereed][Not invited]
  • 錫プラグ入り免震積層ゴムの熱・力学連成挙動に関する研究
    柳勝幸, 清水美雪, 木田英範, 長井大樹, 石井建, 菊地優
    日本建築学会構造系論文集 87 (802) 1142 - 1151 2022/12 [Refereed][Not invited]
  • Kazutaka SHIRAI, Tomoaki ITO, Masaru KIKUCHI
    Journal of Building Engineering 62 105388  2022/12 [Refereed]
  • Jihyun PARK, Kazutaka SHIRAI, Masaru KIKUCHI
    Soil Dynamics and Earthquake Engineering 157 107257  2022/06 [Refereed]
  • 大振幅地震動に対するオイルダンパーの繰り返し依存性を考慮した時刻歴応答解析に関する研究
    荻野伸行, 石井建, 菊地優, 岡本真成, 中原学
    構造工学論文集 68B 376 - 385 2022/03 [Refereed][Not invited]
  • Masaru Kikuchi, Mineo Takayama
    17th World Conference on Earthquake Engineering 2021/09 [Not refereed][Not invited]
  • Evaluation of effective seismic energy input rates based on long-term earthquake observation recoreds
    Ken Ishii, Masaru Kikuchi, Masanori Iiba, Toshihide Kashima
    17th World Conference on Earthquake Engineering 2021/09 [Not refereed][Not invited]
  • Masayuki Yanagi, Miyuki Shimizu, Yuto Kobashi, Akira Yasunaga, Masaru Kikuchi
    17th World Conference on Earthquake Engineering 2021/09 [Not refereed][Not invited]
  • Masaru Kikuchi, Ken Ishii, Takahisa Mori, Ryotaro Kurosawa, Hiroshi Sugiyama, Takahiro Koizumi
    17th World Conference on Earthquake Engineering 2021/09 [Not refereed][Not invited]
  • 荻野伸行, 菊地優, 岡本真成, 中原学
    構造工学論文集 67B 549 - 556 2021/03 [Refereed]
  • 射場淳, 渡辺宏一, 石井建, 菊地優
    構造工学論文集 67B 539 - 548 2021/03 [Refereed]
  • 柳勝幸, 清水美雪, 齊木健司, 安永亮, 菊地優
    構造工学論文集 67B 519 - 529 2021/03 [Refereed]
  • 和氣知貴, 菊地優, 石井建
    日本建築学会構造系論文集 84 (763) 1187 - 1197 2019/09 [Refereed][Not invited]
  • Hiroki Hamaguchi, Shunji Yamamoto, Wake Tomotaka, Masaru Kikuchi
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia 2019/07 [Not refereed][Not invited]
  • Nobuyuki Ogino, Masaru Kikuchi, Masanari Okamoto
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia 2019/07 [Not refereed][Not invited]
  • Wake Tomotaka, Masaru Kikuchi, Ken Ishii
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia 2019/07 [Not refereed][Not invited]
  • Masaru Kikuchi, Ken Ishii, Hideaki Kato, Masahiro Nakamura
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia 2019/07 [Not refereed][Not invited]
  • Ken Ishii, Masaru Kikuchi
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia 2019/07 [Not refereed][Not invited]
  • Hiroki Hamaguchi, Tomotaka, Wake, Masashi Yamamoto, Masaru Kikuchi
    Japan Artchitectural Review 2 (3) 323 - 339 2019/07 [Refereed][Not invited]
  • Masaru Kikuchi, Ken Ishii
    Proceedings of the 7th Structural Engineers World Congress 2019, Istanbul, Turkey 2019/04 [Not refereed][Not invited]
  • Effective Seismic Input Rates for Exsiting Buildings Considering Soil-Structure Interaction
    Ken Ishii, Masaru Kikuchi, Jun Yoshida
    Proceedings of the 7th Structural Engineers World Congress 2019, Istanbul, Turkey 2019/04 [Not refereed][Not invited]
  • Ken Ishii, Masaru Kikuchi
    Earthquake Engineering & Structural Dynamics 48 (1) 65 - 77 0098-8847 2019/01 [Refereed]
  • Masaru Kikuchi, Ken Ishii
    1st International Conference on Numerical Modelling in Engineering, Ghent, Belgium 2018/08 [Not refereed][Not invited]
  • 和氣知貴, 菊地優, 石井建, 黒嶋洋平, 仲村崇仁
    日本建築学会構造系論文集 83 (750) 1105 - 1115 2018/08 [Refereed][Not invited]
  • HAMAGUCHI Hiroki, WAKE Tomotaka, YAMAMOTO Masashi, KIKUCHI Masaru
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 83 (749) 1009 - 1019 1340-4202 2018/07 [Refereed][Not invited]
     
    The authors have been developing a new seismic isolation bearing, which consists of a lead rubber bearing (LRB) and a slider bearing as a fail-safe (FS) mechanism in series. The bearing called “FSLRB” behaves as a general LRB which is just friction connected to the building structure at either of upper or lower end, when subjected to design level earthquakes or smaller, while the sliding behavior keeps LRB away from giving excessive hardening and shear break in severe earthquakes beyond expectations. Hence, FSLRB has much higher seismic safety compared to general isolation bearings including conventional LRBs. In this paper, dynamic and quasi-static horizontal loading tests under constant or varying compressive loadings for several kinds of scaled and full-scale FSLRB specimens are conducted, to evaluate the effect of bi-directional excitations on additional torsion in the LRB part and changes in friction properties in the slider part. Ultimate performance limit of a full-scale bearing is also investigated under extremely high surface pressures beyond expectations.
     Dynamic loading tests of two types of □-200mm scaled specimens, each has different second shape factor in the LRB part, make clear that there is no apparent difference in friction properties between uni-directional and bi-directional excitations, and no damage to the LRB part due to the torsional behavior in bi-directional excitation, as far as the bearing is applied under a reasonable surface pressure around 10 N/mm2. Bi-directional dynamic loading tests of a □-900mm full-scale specimen show that there is no significant scale-effect between the full-scale FSLRB and the □-200mm scaled one on both the torsional behavior of the LRB part and friction properties of the slider part. Uni-directional dynamic loading tests of □-600mm full-scale specimens indicate that dynamic and static friction coefficients have quite low velocity dependence in reasonable sliding speed expected in the practical use. Finally, uni-directional quasi-static loading tests of □-600mm specimens show that the bearing should be applied under surface pressure of 20 N/mm2 or lower, to give a well-ordered tri-linear hysteresis curve without causing any unexpected incidents such as partial uplift of the slider part and buckling or shear break of the LRB part.
     Furthermore, surface pressure dependence of dynamic and static friction coefficients are inductively estimated applying all the data obtained in the series of the research, including the test results of □-60mm scaled slider, □-414mm scaled FSLRB and □-900mm full-scale FSLRB introduced in the authors’ preceding paper. The data indicate that both dynamic and static friction coefficients are highly affected by the dimensions of each FSLRB, those are the second shape factor of the LRB part and out-of-plane stiffness of the steel plates between the LRB part and the slider part. By introducing “effective surface pressure” reflecting the effect of the above two dimensions, friction coefficients can be even accurately estimated compared to a conventional method only using mean surface pressure.
     As a conclusion through the series of the loading tests and the considerations mentioned above, the authors think that FSLRB is ready for the practical use in a seismic isolation system with even higher safety margin compared to conventional systems.
  • Masaru Kikuchi, Ken Ishii
    16th European Conference on Earthquake Engineering, Thessaloniki, Greece 2018/06 [Not refereed][Not invited]
  • 鉛の繰り返し載荷による熱・力学連成挙動評価に関する研究
    西村拓也, 熊谷仁志, 菊地優
    構造工学論文集 64B 333 - 344 2018/03 [Refereed][Not invited]
  • Kazutaka Shirai, Masaru Kikuchi, Ken Ishii, Sadamasa Komaki
    AIJ Journal of Technology and Design 24 (56) 201 - 206 1881-8188 2018/02/01 [Refereed][Not invited]
     
    The main hall of Ohtaniha Hakodatuin, which was completed in 1915, is the oldest temple architecture using reinforced concrete structure in Japan. The temple has been designated as an Important Cultural Property of Japan in 2007. In this paper, structural characteristics of the temple based on previous studies were described. Furthermore, evaluation of vibration behavior of the temple by micro-tremor observation and eigenvalue analysis using numerical 3-D frame models were presented. From the results, natural frequencies of the analytical model with decreased concrete Young's modulus considering aging and construction situation showed a good agreement with the micro-tremor observation results.
  • Kazutaka Shirai, Masaru Kikuchi, Tomoaki Ito, Ken Ishii
    International Journal of Architectural Heritage 2018 [Refereed][Not invited]
  • Hiroki Hamaguchi, Tomotaka Wake, Masashi Yamamoto, Masaru Kikuchl
    Journal of Structural and Construction Engineering 82 (739) 1349 - 1359 1881-8153 2017/09/01 [Refereed][Not invited]
     
    Seismically isolated (SI) buildings are thought to be fragile when subjected to excessive input ground motions beyond design level. The authors have been proposing a new isolation bearing which has much higher seismic safety than conventional bearings. Supporting a superstructure only by the proposed bearings will enable the whole SI building to protect from any structural damage. In this paper, the development process of the proposed bearing including the selection of the most suitable slider material, dynamic loading test of a scaled bearing and quasi-static loading test of a full-scale bearing is mentioned. Preliminary and detailed time history analyses of SI building models are also shown. The research results lead to the conclusion that a system applying the proposed bearings realizes an SI building with higher seismic safety than ever, if only provided a large enough isolation gap.
  • Ken Ishii, Masaru Kikuchi, Takuya Nishimura, Cameron J. Black
    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 46 (4) 677 - 694 0098-8847 2017/04 [Refereed][Not invited]
     
    This paper presents a mechanical model for predicting the behavior of elastomeric seismic isolation bearings subject to combined end rotations and shear deformation. The mechanical model consists of a series of axial springs at the top, mid-height and bottom of the bearing to vertically reproduce asymmetric bending moment distribution in the bearings. The model can take into account end rotations of the bearing, and the overall rotational stiffness includes the effect of the variation of vertical load on the bearing and the imposed shear deformation. Static bending tests under various combinations of vertical load and shear deformation were performed to identify the mechanical characteristics of bearings. The test results indicate that bearing rotational stiffness increases with increasing vertical load but decreases with increasing shear deformation. Simulation analyses were conducted to validate the new mechanical model. The results of analyses using the new model show very good agreement with experimental observations. A series of seismic response analyses were performed to demonstrate the dynamic behavior of top-of-column isolated structures, a configuration where the end rotations of isolation bearings are typically expected to be larger. The results suggest that the end rotations of elastomeric bearings used in practical top-of-column isolated structures do not reduce the stability limit of isolation system. Copyright (c) 2016 John Wiley & Sons, Ltd.
  • 過大変位抑制機構付き可変摩擦ダンパーによる鋼構造超高層建築の地震応答制御効果に関する解析的研究
    白井和貴, 李イ科, 石井歩, 菊地優
    構造工学論文集 63B 153 - 160 2017/03 [Refereed][Not invited]
  • 黒嶋洋平, 石井建, 菊地優, 飯場正紀, 白井和貴
    構造工学論文集 63B 231 - 239 2017/03 [Refereed][Not invited]
  • Hiroki Hamaguchi, Masashi Yamamoto, Tomotaka Wake, Masaru Kikuchi
    EMI2017 日本建築学会 82 (739) 1349 - 1359 1340-4202 2017 [Not refereed][Not invited]
     
    Since seismically isolated (SI) buildings are thought to be fragile when subjected to extreme input ground motions beyond design level, various measures such as shock absorbers on moat walls and stoppers put in isolation level have been developed. Those technologies should be helpful to increase seismic safety margin of SI buildings, while they cannot avoid the damage to moat walls, superstructure, or isolation devices. In this paper, the authors propose a new lead rubber bearing (LRB) which has much higher seismic safety compared to general isolation bearings including conventional LRBs.
     The proposed bearing named “FSLRB” or “Fail-Safe LRB” consists of a conventional LRB and a newly developed slider system in series. Friction factor of the slider system is optimally provided to start sliding just before LRB gives a hardening property with the shear strain of around 250%. Then, the bearing behaves as a general LRB which is just friction connected to the building structure at either of upper or lower end, when subjected to design level earthquakes or smaller, while the sliding behavior keeps LRB away from hardening and shear break in severe earthquakes beyond expectations. Hence, supporting a superstructure only by the proposed bearings will enable the whole SI building to protect from any structural damage regardless of the input ground motion levels. A preliminary time history analysis for two SI building models, one applying only FSLRBs, the other applying only conventional LRBs, shows the advantages of the system with the proposed bearings.
     Realizing the above high seismic performance, firstly the most suitable slider material, which was a certain PTFE, was selected by conducting a series of dynamic loading test for each combination of stainless steel plate (SUS304) and 12 candidate slider materials. A dynamic loading test of a scaled FSLRB applying the selected PTFE showed that the bearing almost behaved as expected in the preliminary time history analysis. Dynamic and static friction factors were evaluated as well as surface pressure and velocity dependence of those two factors were formulated from the test results. Furthermore, a full-scale FSLRB was tested under a rather high compression force with quasi-static horizontal loading, to investigate the maximum allowable conditions regarding surface pressure and the second shape factor of LRB part. Finally, a detailed time history analysis of a FSLRB building model was conducted. As for the analysis model, 256 full-size FSLRBs with the mechanical properties evaluated in the above loading tests supported a deformed nuclear power plant consisted of a reactor building and a turbine building set on a common isolation raft. The analysis result showed that the superstructure remained elastic and the maximum responses were lower than design criteria even when subjected to a long-period ground motion beyond design level. On the other hand, it became clear that both the maximum deformation and residual deformation at isolation level were much larger than conventional LRB building model.
      From the above development and analyses, it can be finally concluded that an SI building applying the proposed bearings can realize much higher seismic safety compared to conventional SI buildings, if only provided a large enough isolation gap considering the maximum considered earthquakes.
  • Analytical Study on the Seismic Retrofitting of a Historical Reinforced Concrete Temple using Frcition Dampers
    Kazutaka Shirai, Masaru Kikuchi, Tomoaki Ito, Ken Ishii
    Proceesing of the 3rd International Conference on Protection of Historical Constructions, Lisbon, Portugal 2017 [Not refereed][Not invited]
  • Ken Ishii, Masaru Kikuchi, Yohei Kuroshima
    EMI2017 2017 [Not refereed][Not invited]
  • Masaru Kikuchi, Ken Ishii, Kato Hideaki, Masahiro Nakamura
    EMI2017 2017 [Not refereed][Not invited]
  • T. Wake, M. Kikuchi, K. Ishii
    2017 NZSEE Conference 2017 [Not refereed][Not invited]
  • Horizontal Biaxial Loading Tests on Sliding Lead Rubber Bearing System
    M. Yamamoto, H. Hamaguchi, N. Kamoshita, M. Kikuchi, K. Ishii, T. Wake
    2017 NZSEE Conference 2017 [Not refereed][Not invited]
  • Kazutaka SHIRAI, Ayumu ISHII, Masaru KIKUCHI
    Steel Construction Engineering 23 (90) 89 - 104 2016/06 [Refereed][Not invited]
  • Hideaki Kato, Takahiro Mori, Nobuo Murota, Masaru Kikuchi
    JOURNAL OF STRUCTURAL ENGINEERING 141 (9) 04014213-1 - 04014213-9 0733-9445 2015/09 [Refereed][Not invited]
     
    In the present study, a new analytical model of high-damping rubber bearings (HDRBs) for time-history analysis is proposed. The proposed model is used in the evaluation of elastoplastic and creep-like behavior of HDRBs under bidirectional seismic and strong wind loading. The analytical model was developed by reducing the degrees of freedom of a new type of constitutive law that was proposed by the authors for finite-element analysis of seismic isolation bearings. First, the validity of the proposed model for time-history response analysis was examined through various tests of HDRBs under unidirectional and bidirectional loading. The analytical results agreed well with the test results. Next, wind loading tests were conducted and the reproducibility of creep-like behavior of HDRBs under wind loading was evaluated. The effectiveness of the proposed model was verified by the tests, and the limitations of the applicability of the proposed model were determined. (C) 2014 American Society of Civil Engineers.
  • 菊地優, 鵜原正樹, 白井和貴, 山本雅史, 佐々木頼孝
    構造工学論文集 61B 471 - 480 2015/03 [Refereed][Not invited]
  • Analytical model for lead-rubber bearings considering heat conduction
    Ippei Tsunezawa, Masaru Kikuchi, Takahito Nakamura
    EMI2015 2015 [Not refereed][Not invited]
  • Performance and response analysis of a seismically isolated building during the 2011 Tohoku earthquake, Japan
    Masaru Kikuchi, Toshihide Kashima, Kyo Fukuda
    EMI2015 2015 [Not refereed][Not invited]
  • Masaru Kikuchi, Hideaki Kato, Masashi Yamamoto, Ken Ishii, Kazutaka Shirai
    Journal of Structural and Construction Engineering 80 (713) 1067 - 1077 1881-8153 2015 [Refereed][Not invited]
     
    A mechanical model for predicting the triaxial behavior of high-damping rubber bearings under bidirectional horizontal deformations and axial load is presented in this paper. This new model is developed by combining two existing models, both of which have been previously proposed by the authors. Tests of isolation bearings under bidirectional horizontal loading with different axial load levels were conducted. The experimental formulae for the bidirectional hysteresis model in the mechanical model were identified from the test results. The proposed model is shown to be capable of expressing the influence of the bidirectional deformations and axial load on the hysteresis loops.
  • Takuya Nishimura, Keiji Nakanishi, Masanori Iiba, Masaru Kikuchi
    Journal of Structural and Construction Engineering 80 (711) 735 - 743 1881-8153 2015 [Refereed][Not invited]
     
    This paper presents an analytical hysteresis model of horizontal force-deformation relationship for lead dampers to evaluate the safety of seismic isolation system exposed to long-period earthquake motion. Dynamic loading tests with full-scale dampers were conducted. Yielding strength of damper declined with increase in accumulative deformation, however, it showed rise up temporarily when deformation amplitude was changed on sinusoidal horizontal loading. The analytical model can consider these features. Horizontal load of the test given response displacement motions at isolation layer obtained by a seismic time-history analysis using long-period earthquake motion was in good agreement with one calculated from the model.
  • Makoto Matsumora, Takeaki Koshikawa, Masaru Kikuchi
    Journal of Structural and Construction Engineering 79 (701) 1005 - 1013 1881-8153 2014/07/01 [Refereed][Not invited]
     
    This paper describes new evaluation formulas of ultimate strength and rotation angle for unbonded post-tensioned precast concrete beams. These formulas are composed by two main variables, one is a reinforcement index(q) and the other is an effective prestressing level (λpe). To evaluate coefficients of the evaluation formulas, we carried out a parametric study with a numerical section analysis model, and obtained regression formulas for the coefficients. By applying the evaluation formulas to the results of parametric study and experiments on the past, we elucidate that the formulas evaluate the ultimate strengths and rotation angles of them accurately.
  • Response Analysis of a Seismic Isolation Retrofit: The National Museum of Western Art Building in Tokyo, Japan
    Masaru Kikuchi, Masaki Uhara, Toshihide Kashima, Kyo Fukuda
    Proceesing of the 2nd International Conference on Protection of Historical Constructions, Antalya, Turkey 865 - 870 2014/05 [Not refereed][Not invited]
  • Naoto Kamoshita, Masashi Yamamoto, Shigeo Minewaki, Masaru Kikuchi, Ken Ishii, Osamu Kouchiyama, Takahito Nakamura
    Journal of Structural and Construction Engineering 79 (698) 453 - 461 1881-8153 2014 [Refereed][Not invited]
     
    A series of bidirectional loading tests were conducted on a high friction type sliding rubber bearing. Tests were conducted under horizontal bidirectional loading and constant or fluctuant vertical loading. Regardless of the vertical loading methods, the maximum shear strain under bidirectional loadings increased approximately 40% - 50% compared to nominal shear strain. Reflecting mechanical characteristics of the bearing, the analytical model of elastic sliding bearings was proposed. This model accurately represented force-displacement relationships under horizontal bidirectional loading and constant or fluctuant vertical loading.
  • Masaru Kikuchi, Masashi Yamamoto, Ken Ishii, Yoritaka Sasaki
    Journal of Structural and Construction Engineering 79 (696) 257 - 265 1881-8153 2014 [Refereed][Not invited]
     
    This paper focuses on the horizontal bidirectional mechanical properties of low-modulus G0.35 type high-damping rubber bearings. Tests of reduced-scale bearings were conducted to identify the mechanical properties of the bearings. The influence of bidirectional loading was strongly apparent in the measured hysteresis properties. A refinement to an existing analytical model was provided to predict the mechanical behavior of a wide variety of high-damping rubber bearings. Additional shear strain due to twist deformation was included to evaluate shear stress components in the bearing. Seismic response analyses were performed to evaluate the dynamic behavior of an isolated building under bidirectional earthquake excitations.
  • ITO Tomoaki, SHIRAI Kazutaka, KIKUCHI Masaru, SANO Takeshi
    Kou kouzou rombunshuu 社団法人 日本鋼構造協会 21 (84) 84_57 - 84_65 1880-9928 2014 
    As a new damper which is suited to seismic retrofit for existing high-rise buildings, the authors have developed a passive variable friction damper (VFD) with displacement dependent damping force characteristics. In the present paper, in order to evaluate the response control effects of high-rise buildings incorporating VFDs, earthquake response analyses were conducted using thirty-story frame structure models with VFDs, with conventional friction dampers, or without dampers. The results indicated that VFDs can mitigate response story shear forces and column axial forces compared with conventional friction dampers.
  • Evaluation of Long-term Variation in Dynamic Properties of a Tall Reinforced Concrete Tower with Tuned Liquid Dampers
    Ken Ishii, Masaru Kikuchi
    HKICEAS-648, Hong Kong International Conference on Engineering and Applied Science 2013/12 [Not refereed][Not invited]
  • Strucural Characteristics of a hystorical reinforced templce building, Hibashi-honganji Hakodate Betsuin
    KIKUCHI Masaru
    The 13th East Asia-Pacfic Conference on Structural Engineering and Construction, Sapporo, Japan 2013/09 [Not refereed][Not invited]
  • Ken Ishii, Masaru Kikuchi, Yoriko Suzuki
    13th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures, Sendai, Japan 2013/09 [Not refereed][Not invited]
  • Takahito Nakamura, Masaru Kikuchi, Ken Ishii, Osamu Kouchiyama
    AIJ Journal of Technology and Design 19 (42) 471 - 476 1341-9463 2013/06 [Refereed][Not invited]
     
    Ultimate behavior of Lead Rubber Bearing (LRB) and Natural Rubber Bearing (RB) was investigated by bi-directional loading tests. LRB specimens provided by 7 types small models, which have square and circular shape, varied lead plug diameters, lead plug disposition and rubber layers. RB specimen was provided by square shape without lead plug. In this study it was cleared that brake-shear-strain was not influenced by the cross-section shape, lead plug diameters, and lead plug dispositions. Moreover LRB wasn't spoiled for brake-shear-strain under the bi-directional loading. It was also found that the brake-shear-strain of LRB was the same as that of RB.
  • アンボンドPCaPC梁部材と対象とする断面解析モデルの適用性に関する一検討
    松茂良諒, 越川武晃, 菊地優
    構造工学論文集 59B 73 - 80 2013/03 [Refereed][Not invited]
  • Kazutaka Shirai, Masaru Kikuchi
    Journal of Structural and Construction Engineering 78 (684) 261 - 269 1340-4202 2013/02 [Refereed][Not invited]
     
    This paper presents a seismic response control design method considering robustness on building structures with inter-story rotational inertia mass dampers. The proposed method employs normalized contour maps of H2 norm (root mean square) or weighted H2 norm of transfer functions of systems. The concept of interval analysis methods is applied to deal with structural uncertainties which are assumed to be bounded. The influence of variations in parameters has been easily evaluated by these contour maps.
  • Takahito Nakamura, Masaru Kikuchi, Ken Ishii, Osamu Kouchiyama
    Journal of Structural and Construction Engineering 77 (681) 1663 - 1671 1340-4202 2012/11 [Refereed][Not invited]
     
    Reduction of the horizontal deformation capacity of elastomeric isolation bearings under bi-directional loading has been one of the major concerns since that such a phenomenon was observed for high-damping rubber bearings. Using a newly constructed loading machine, a series of tests of lead rubber bearings (LRBs) were conducted to investigate their detailed mechanical characteristics under horizontal bi-directional deformation in the paper. The influences of the configurations, such as shape of cross section, diameter of a lead plug and aspect ratio, on the bi-directional behavior were carefully examined. Simulation analyses were also conducted to predict the bi-directional behavior of LRBs.
  • Dynamic Properties of a Tall Reinforced Concrete Tower with Tuned Liquid Dampers
    Ken Ishii, Masaru Kikuchi, Yoriko Suzuki
    The 2012 World Congress on Advances in Civil, Environmental, and Materials Research, Seoul, Korea 2012/08 [Not refereed][Not invited]
  • KATO Hideaki, MORI Takahiro, SAMEJIMA Yusuke, MUROTA Nobuo, KIKUCHI Masaru, CHANG Kuo-Chun, HWANG Jenn-Shin, WANG Shiang-Jung
    Journal of structural engineering. B 一般社団法人日本建築学会 58B 231 - 240 0910-8033 2012/03 [Refereed][Not invited]
  • Response Modification Factor for the Design of Seismically Isolated Buildings
    S. Kitayama, K. Ishii, M. Kikuchi
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Safety Verificaion of Seismic Isolation System using Sliding Bearings against Long Period Earthquake Motions
    H. Hibino, R. Maseki, A. Nii, S Minewaki, M. Yamamoto, H. Yoneda, M. Takayama, M. Kikuchi, M. Iiba
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • K. Ishii, M. Kikuchi, K. Shirai
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Safety Verificaion of Seismic Isolation System Using Rubber Bearing Against Long-Period Earthquake Motion
    M. Hikita, E. Takaoka, A. Kondo, T. Nishimura, S. Yamamoto, M. Takayama, M. Kikuchi, M. Iiba
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Safety Verificaion of Seismic Isolation System Using Elasto-plastic Dampers against Long-Period Earthquake Motion
    S. Yamamoto, T. Nishimura, K. Nakanishi, M. Hikita, Y. Takenaka, M. Takayama, M. Kikuchi, M. Iiba
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Simulation analysis for the ultimate behavior of full-scale lead-rubber seismic isolation bearings
    M. Kikuchi, I. D. Aiken, A. Kasalanati
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • M. Yamamoto, S. Minewaki, N. Kamoshita, M. Kikuchi, K. Ishii, O. Kouchiyama, T. Nakamura
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Takahito Nakamura, Osamu Kouchiyama, M. Kikuchi
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Safety Verificaion of Seismic Isolation System using Oil and Viscous Dampers against Long Period Earthquake Motions
    S Minewaki, M. Yamamoto, H. Yoneda, R. Maseki, I Nagashima, A. Nii, M. Takayama, M. Kikuchi, M. Iiba
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • A New Hysteresis Model Based On An Integral Type Deformation-history for Elastomeric Seismic Isolation Bearings
    H. Kato, T. Mori, N. Mutota, S. Suzuki, M. Kikuchi
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • A New Analytical Model for Reinforced Concrete Bearm-Column Joints Subjected to Cyclic Loading
    T. Saito, M. Kikuchi
    Proceeding of the 15th World Conference on Earthquake Engineering 2012 [Not refereed][Not invited]
  • Kazutaka Shirai, Takeshi Sano, Yasumasa Suzui, Mitsuru Kageyama, Masaru Kikuchi
    AIJ Journal of Technology and Design 18 (38) 85 - 90 1341-9463 2012 [Refereed][Not invited]
     
    A friction damper with displacement dependent variable damping force characteristics was developed. The damper was designed to decrease damping force when damper displacement exceeded a predetermined value. Therefore, the damper is ideal for aseismic retrofit of existing skyscraper buildings in preparation for long-period earthquake ground motions expected to occur in the near future. Dynamic loading tests were conducted on a full-scale steel frame with a brace-type variable friction damper to verify the damper performance. The damper exhibited on-target characteristics, stable performance, and a high endurance capacity under cyclic loadings.
  • Hideaki Kato, Takahiro Mori, Nobuo Murota, Ken Ishii, Masaru Kikuchi
    Journal of Structural and Construction Engineering 76 (667) 1721 - 1728 1340-4202 2011/09 [Refereed][Not invited]
     
    A new hysteresis model for high-damping rubber bearings is proposed, which has been developed based on an elasto-plastic, integraltype deformation history constitutive law. One of the characteristics of the proposed model is the applicability of the same material parameters as the proposed model to finite element method analyses. Firstly, we derive the horizontal biaxial hysteresis model from the elasto-plastic constitutive law. Next, we compare the results of numerical analyses using the proposed hysteresis model with experimental results for tests of high-damping rubber bearings subjected to horizontal biaxial loading, and verify the validity of the proposed model. Lastly, we perform finite element method analyses and numerical analyses using a multi-shear springs model, and the results from each of these cases are compared with results given by the proposed model.
  • Ken Ishii, Masaru Kikuchi
    Journal of Structural and Construction Engineering 76 (666) 1425 - 1431 1340-4202 2011/08 [Refereed][Not invited]
     
    This paper describes two types of normalized modulus distribution under compression and bending for a circular rubber with pad top and bottom surfaces that are bonded to rigid layers. The distribution is applied to a series of axial springs to account for the compressive and bending moduli of the rubber pad. The paper demonstrates thai the series of axial springs with varied modulus distribution has higher ratio of bending stifl'ness to compressive stiffness than the rubber pad. To define the correct ratio of bending stiffness to compressive stiffness, a nonlinear elastic model is provided for the axial springs. By using the varied modulus distribution and a nonlinear elastic model, the series of axial springs can produce much improved behavior over the uniform modulus assumption.
  • Bi-axial Horizontal Response for a Seismically-isolated Building with High-damping Rubber Bearings
    Masashi Yamamoto, Masaru Kikuchi, Ken Ishii, Harumi Yoneda, Shigeo Minewaki, Hideaki Kato
    12th World Conference on Seismic Isolation, Energy Dissipation and Active Control of Structures 2011 [Not refereed][Not invited]
  • Masaru Kikuchi, Takahito Nakamura, Ian D. Aiken
    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 39 (13) 1513 - 1531 0098-8847 2010/10 [Refereed][Not invited]
     
    Square seismic isolation bearings are economical to manufacture, offer the advantage of simple connection configurations and have compact geometry requiring a minimum of space for installation. To be able to more effectively utilize square bearings for seismic isolation systems, a new mechanical model for predicting the large shear deformation behavior of square elastomeric isolation bearings is presented in this paper. The new model is developed by extending to three dimensions an existing model for elastomeric isolation bearings under severe axial loads and shear deformations. The model comprises multiple shear springs at the mid-height and a series of axial springs at the top and bottom boundaries. Static loading tests of square lead rubber isolation bearings were performed to investigate the influence of horizontal loading direction and axial load magnitude on bearing behavior. The test results showed that the ultimate behavior is strongly influenced by loading direction, especially under large shear deformation and high axial load. To confirm the validity of the model, analyses are performed of the loading tests of the square lead rubber isolation bearings. The results of analyses using the new model show very good agreement with the experimental results. Copyright (C) 2010 John Wiley & Sons, Ltd.
  • 菊地 優, 石井 建, 加藤秀章
    構造工学論文集 56B 179 - 188 2010/03 [Refereed][Not invited]
  • Masaru Kikuchi, Ken. Ishii, Takahito Nakamura, Ian D. Aiken
    Joint conference proceedings, 7CUEE and 5ICEE 1097 - 1014 2010 [Not refereed][Not invited]
  • Ken Ishii, Masaru Kikuchi, Yoshihisa Kitamura, Takahito Nakamura
    Journal of Structural and Construction Engineering 75 (647) 87 - 93 1881-8153 2010 [Refereed][Not invited]
     
    This paper presents a new analytical model for predicting the behavior of elastomeric seismic isolation bearings subject to combined eccentric bending moments and shear deformation. The mechanical model consists of a series of axial springs at the top, mid-height and bottom of the isolator. The model can account for end rotations of the isolator, and the overall isolator rotational stiffness can include the influence of the variation of vertical load on the isolator and the imposed shear deformation. To identify the mechanical characteristics of isolators, static bending tests under various combinations of vertical load and shear deformation were performed. The results of analyses using the new model show very good agreement with experimental observations.
  • Masaru Kikuchi, Sachie Yamamoto, Takahito Nakamura, Takuya Nishimura, Kazuo Tamura
    Journal of Structural and Construction Engineering 74 (638) 647 - 655 1340-4202 2009/04 [Refereed][Not invited]
     
    The paper describes a new analytical model for predicting the large displacement behavior of square lead-rubber isolation bearings. The present model is developed by extending to three dimensions an existing model for elastomeric isolation bearings under severe axial loads and shear deformations. Static loading tests of square lead-rubber bearings are performed to investigate the effect of loading direction on bearing behavior. The test results showed that the ultimate behavior is strongly influenced by loading direction, especially for large shear deformation and high axial load. The results of analyses using the new model show very good agreement with the experimental results.
  • 天然ゴム系積層ゴムの水平鉛直同時加力時の大変形挙動特性に関する研究
    西村拓也, 山本祥江, 黒澤 到, 菊地 優, 甲斐芳郎, 仲村崇仁
    構造工学論文集 55B 517 - 525 2009/03 [Refereed][Not invited]
  • Sachie Yamamoto, Masaru Kikuchi, Masaiki Ueda, Ian D. Aiken
    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 38 (2) 157 - 180 0098-8847 2009/02 [Refereed][Not invited]
     
    For the purpose of predicting the large-displacement response of seismically isolated buildings, an analytical model for elastomeric isolation bearings is proposed. The model comprises shear and axial springs and a series of axial springs at the top and bottom boundaries. The properties of elastomeric bearings vary with the imposed vertical load. At large shear deformations, elastomeric bearings exhibit stiffening behavior under low axial stress and buckling under high axial stress. These properties depend on the interaction between the shear and axial forces. The proposed model includes interaction between shear and axial forces, nonlinear hysteresis, and dependence on axial stress. To confirm the validity of the model, analyses are performed for actual static loading tests of lead-rubber isolation bearings. The results of analyses using the new model show very good agreement with the experimental results. Seismic response analyses with the new model are also Conducted to demonstrate the behavior of' isolated buildings under severe earthquake excitations. The results obtained from the analyses with the new model differ in some cases from those given by existing models. Copyright (C) 2008 John Wiley & Sons, Ltd.
  • M. Kikuchi, K. Morihiro, I. D. Aiken
    PROTECTION OF HISTORICAL BUILDINGS - PROHITECH 09, VOL 1 AND 2 1 (1) 689 - + 2009 [Not refereed][Not invited]
     
    This paper proposes an analytical hysteresis model to predict the small shear strain behavior of high-damping rubber isolation bearings (HDR). The National Museum of Western Art (NMWA) in Tokyo, Japan was seismically upgraded in 1998 with a seismic isolation system. The design analyses for the upgrade utilized an existing hysteresis model for HDR isolation bearings. The model was capable of predicting the nonlinear properties of HDR isolators for deformations expected in large earthquakes. Since the upgrade, the acceleration response of the building has been recorded for a number of small earthquakes. The maximum deformation of the HDR isolators in the small earthquakes was below the strain range for which the hysteresis model had been developed, so the small deformation force-displacement relationships for the isolation system were identified from the observed building acceleration records and the original HDR hysteresis model was extended to cover a broad range of shear strain.
  • Sachie Yamamoto, Masaru Kikuchi, Takeaki Koshikawa, Masaiki Ueda
    Journal of Structural and Construction Engineering 73 (634) 2101 - 2110 1340-4202 2008/12 [Refereed][Not invited]
     
    The widespread use of isolation has necessitated a better understanding of the more complex aspects of isolation device behvior. The porperties of seismic isolation devices depend upon the interaction between horizontal and vertical forces acting on the isolator. The actural hysteretic behavior of an isolation bearing under a structure subjected to severe earthwuake shaking is influenced by the variation of vertical load on the islator due to overturing forces. To identify the mechanical charcteristcs of lead-rubber isolators, cyclic shear tests of isolators under varying vetical load were conducted. The authors propose an analytical model for predicting the behavior of islators under varying vertical load conditions. The model can reflect the influence of verying vertical load on islator properties, and thios capability is confirmed by simulation analyses and comparison with the cyclic shear test results. The analytical model is also used to investigate the behavior of lead-rubber isolators under loadings more severe than typical design conditions.
  • Masaru Kikuchi, Cameron J. Black, Ian D. Aiken
    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 37 (5) 659 - 679 0098-8847 2008/04 [Refereed][Not invited]
     
    This paper investigates the seismic response of yielding isolated structures. To establish a general understanding of the nonlinear response of seismically isolated structures, this study first investigates the nonlinear response of isolated structures subjected to steady-state harmonic motion and nonlinear transient ground excitation. The response of both viscously damped and hysteretically damped isolation systems is investigated in three phases. Initially, basic insights are gained through simple nonlinear two degrees of freedom (2-DOF) models subjected to harmonic motion of varying frequencies. Next, the transient response analysis of the nonlinear 2-DOF model is investigated for a wide range of isolation system and superstructure properties. The results obtained from both approaches indicate that the yielding behavior of a structure on an isolation system is significantly different from that of the comparable fixed-base structure. Finally, the response of the nonlinear 2-DOF system model is compared with that of a 15-story, three-dimensional model. Based on the results of these analytical investigations, some important considerations for the design of seismically isolated structures are presented. Copyright (C) 2007 John Wiley & Sons, Ltd.
  • Analytical modeling of elastomeric isolation bearings unders severe axial load and shear deformations
    S. Yamamoto, M. Kikuchi, I. D. Aiken
    Proceeding of the 14th World Conference on Earthquake Engineering 05-06-0018  2008 [Refereed][Not invited]
  • 接合部のせん断変形を考慮したRC骨組の非線形挙動解析
    斎藤隆典, 越川武晃, 上田正生, 菊地 優
    日本建築学会 構造系論文集 (622) 99 - 106 2007/12 [Refereed][Not invited]
  • 並列多軸ばねを用いた積層ゴムの大変形挙動解析
    山本祥江, 菊地 優, 越川武晃, 上田正生
    日本建築学会 構造系論文集 (618) 81 - 88 2007/08 [Refereed][Not invited]
  • KOTSUKI Atsushi, YAMAMOTO Sachie, KIKUCHI Masaru, KOSHIKAWA Takeaki, UEDA Masaiki
    Journal of structural engineering. B 一般社団法人日本建築学会 53B 9 - 16 0910-8033 2007/03 [Refereed][Not invited]
     
    An analytical model for lead-rubber bearings is proposed to predict bearing force-displacement behavior under extremely large deformation. Static loading tests of a lead-rubber bearing under a range of axial loads were performed to assist in the development of a new hysteresis model for large shear deformation behavior. The hysteresis model is combined with the mechanical model based on the two-spring model previously proposed by Koh and Kelly. The bearing test results showed that the mechanical properties, such as changes in shear stiffness and buckling characteristics, varied with the applied axial load. The proposed model can successfully predict a variety of force-displacement relationships for lead-rubber bearings taking into account the level of applied axial load.
  • M. Kikuchi, S. Yamamoto, I. D. Aiken
    Proceedings of the 8th Pacific Conference on Earthquake Engineering 一般社団法人日本建築学会 53 9 - 16 0910-8033 2007 [Not refereed][Not invited]
     
    An analytical model for lead-rubber bearings is proposed to predict bearing force-displacement behavior under extremely large deformation. Static loading tests of a lead-rubber bearing under a range of axial loads were performed to assist in the development of a new hysteresis model for large shear deformation behavior. The hysteresis model is combined with the mechanical model based on the two-spring model previously proposed by Koh and Kelly. The bearing test results showed that the mechanical properties, such as changes in shear stiffness and buckling characteristics, varied with the applied axial load. The proposed model can successfully predict a variety of force-displacement relationships for lead-rubber bearings taking into account the level of applied axial load.
  • アンボンドPC鋼材を用いたPCa圧着梁部材の履歴特性モデルに関する研究
    小林正仁, 越川武晃, 上田正生, 菊地 優
    コンクリート工学 年次論文集 29 (3) 457 - 462 2007 [Refereed][Not invited]
  • DAN Kazuo, KAMBARA Hiroshi, FUJIKAWA Satoshi, KIKUCHI Masaru
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 71 (602) 119 - 128 1340-4202 2006/04 [Refereed][Not invited]
     
    Prediction technique of strong ground motions has been intensively developed in Japan since the 1995 Hyogo-Ken Nanbu earthquake (M_J 7.3), and it has been applied to the practical prediction for inland earthquakes and plate-boundary earthquakes by Japanese Government. On the other hand, recent earthquakes of the 2001 Geiyo earthquake (M_J 6.4) and the 2004 Mid Niigata prefecture earthquake (M_J 6.8) arose not only requirements of safety of lives and structural elements but also requirements of function of equipments and industrial lines. These requirements are well realized in the performance-based design of structures. Hence, we proposed a method of seismic hazard analysis based on fault rupture scenarios and their occurrence probability for implementation of strong ground motions predicted by fault models in performance-based design of structures.
  • MIZUNO Masae, UEDA Masaiki, KOSHIKAWA Takeaki, KIKUCHI Masaru
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 71 (602) 153 - 160 1340-4202 2006/04 [Refereed][Not invited]
     
    This paper deals with the large deflection analysis of reinforced concrete slabs considering the effect of bond slip of reinforcement. Johansen's yield-line theory is well known method of calculating the ultimate strength of RC slab. However, it under-estimates the ultimate strength of slabs which have fixed edges because of the membrane stress. In order to take it into account, geometrical nonlinearity should be considered. In this paper, we propose the method of large deflection analysis which is based on Murray and Wilson's method. In order to verify the analytical method, three numerical examples are given and the results are compared with the experimental results.
  • 主筋の付着特性に影響を及ぼす各種要因を考慮したRC骨組の履歴挙動解析
    斎藤隆典, 越川武晃, 上田正生, 菊地 優
    構造工学論文集 52B 101 - 108 2006/03 [Refereed][Not invited]
  • 積層ゴムの大変形領域の特性を考慮した免震建物の地震時挙動
    山本祥江, 菊地 優, 越川武晃, 上田正生
    構造工学論文集 52B 221 - 229 2006/02 [Refereed][Not invited]
  • F Ohya, M Ueda, T Uchiyama, M Kikuchi
    JOURNAL OF SOUND AND VIBRATION 289 (1-2) 1 - 24 0022-460X 2006/01 [Refereed][Not invited]
     
    Free vibration analysis of rectangular Mindlin plates is carried out via the superposition method and is shown to produce accurate results. The analytical method proposed by the authors in this paper solves the problem for the case where the plate has simultaneous elastic edge and internal supports. The conditions of edge supports are uniform lateral, rotational and torsional elastic supports, whereas, the internal supports are column supports with finite area. Compatibility between the plate and column is achieved by requiring that the column and plate rotations be equal. The results presented herein are verified through comparison with results presented by others. Numerical examples presented in this study confirm that the analytical method is able to model the property of the elastic edge supports while simultaneously considering the effect of column restraint, an effect which increases with column number and area. (c) 2005 Elsevier Ltd. All rights reserved.
  • 越川武晃, 上田正生, 菊地 優, 小林正仁
    コンクリート工学 年次論文集 日本コンクリート工学協会 28 (2) 73 - 78 1347-7560 2006 [Refereed][Not invited]
     
    本論文では,クリティカル断面となる圧着接合部に普通強度鉄筋を通し配筋し,原点指向性を維持しつつ鉄筋の降伏によってエネルギー吸収を図るアンボンドPC圧着型PCa架構を対象に,著者等の既往の解析法を用いた履歴挙動解析を行い,実験結果との比較ならびにパラメトリックスタディを通して,この種の架講の構造特性について解析的に検証を行った。
  • 柱梁接合部内主筋の付着すべり分布を考慮したRC骨組の履歴挙動解析
    斉藤隆典, 越川武晃, 上田正生, 菊地 優
    コンクリート工学 年次論文集 28 (2) 85 - 90 2006 [Refereed][Not invited]
  • 森廣和幸, 上田正生, 越川武晃, 菊地 優
    コンクリート工学 年次論文集 日本コンクリート工学協会 28 (2) 493 - 498 1347-7560 2006 [Refereed][Not invited]
     
    本研究は,過去に受けた過大な載荷履歴により,たわみやひび割れ障害を受けたスラブを,PC外ケーブルよって再生をはかる補強工法について報告するものである。即ち,補強と同時に,当初の設計荷重を上回る積載を可能とするレトロフィットを意図した補強設計の考え方と,実際の試行・施工手順,更にはその後の載荷実験結果について考察をくわえている。
  • KIKUCHI Masaru, YAMAMOTO Sachie, TAMURA Kazuo, UEDA Masaiki
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 70 (592) 75 - 82 1340-4202 2005/06 [Refereed][Not invited]
     
    The study of the steady-state vibration of a system under sinusoidal excitation can provide important insights into the more general dynamic response structures. The response of seismically-isolated structures with viscously-damped isolation system was previously studied by the authors. This paper presents the non-linear steady-state vibration of seismically-isolated structures with hysteretically-damping isolation system. The solution method for the steady-state vibration of the non-linear system is based on the work of Tajimi, and expanded to seismically-isolated structures. The non-linear superstructure behavior is significantly different from that of fixed-base structure. Consequently, the important aspects for isolated structure design is highlighted.
  • OHYA Fumito, UEDA Masaiki, UCHIYAMA Takeshi, KIKUCHI Masaru
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 70 (588) 95 - 102 1340-4202 2005/01 [Refereed][Not invited]
     
    The use of flat-plate structures have increased because this type of structure can realize optimum and flexible space utilization. In the application of flat-plate structures, slab resonance should be an important consideration, because of potential problems such as incorrect operation of equipment in manufacturing facilities or occupant discomfort in residential structures. However there are few studies on the free vibration analysis of slabs within flat-plate structures. In this paper, the free vibration analyses of plates with columns resting on lateral, rotational and torsional elastic edge supports uniformly are carried out by use of the superposition method based on the Mindlin plate theory. In order to study the vibration properties of the plate, column size, plate aspect ratio and plate thickness ratio are set up as evaluation parameters.
  • 越川武晃, 上田正生, 菊地 優
    コンクリート工学 年次論文集 日本コンクリート工学協会 27 (2) 67 - 72 1347-7560 2005 [Refereed][Not invited]
     
    ファイバーモデルを用いて曲げとせん断を受けるRC梁に発生する斜めせん断亀裂を表現する一手法として,チモシェンコ梁要素を用いたRC梁の材料非線形解析法を提案した。まず有限要素法への定式化の概要と,垂直応力と横せん断応力による2軸応力状態を想定したコンクリートの構成則の取扱いについて記述した。更に,既往の実験結果を対象とした数値計算例を示し,コンクリートに1軸の構成則を用いた従来の解析法との比較を通して,本解析法による荷重一変位応答,亀裂の発生・分布性状について検証した。
  • 柱梁接合部における主筋の付着すべりを考慮したRC平面骨組の履歴挙動解析
    齊藤隆典, 越川武晃, 上田正生, 菊地 優
    コンクリート工学 年次論文集 27 (2) 73 - 78 2005 [Refereed][Not invited]
  • 粘性系ダンパーを用いた免震構造物の非線形定常振動
    菊地 優, 田村和夫, 上田正生
    日本建築学会 構造系論文集 (576) 63 - 70 2004/02 [Refereed][Not invited]
  • Computer program for three-dimensional nonlinear dynamic response analysis of seismically-isolated buildings
    M. Kikuchi, K. Watanabe
    Proceedings of the 13th World Conference on Earthquake Engineering 600  2004 [Refereed][Not invited]
  • Vibration analysis of reinforced concrete beam members including bond-slip reinforcement
    K. Inoue, M. Kikuchi, M. Ueda, T. Koshikawa
    Proceedings of the 13th World Conference on Earthquake Engineering 604  2004 [Refereed][Not invited]
  • Seismic Response of Isolated Structures Depending on Hysteresis Models for Isolation Devices
    Masaru Kikuchi, Ian D. Aiken, Yoshihisa Kitamura, Masaiki Ueda
    S3-3, JSSI 10th Anniversary Symposium on Performance of Response Controlled Buildings S3-3  2004 [Refereed][Not invited]
  • 面外せん断変形ならびに補強材の付着すべりの影響を考慮した有限要素解析
    水野雅枝, 上田正生, 菊地 優, 内山武司
    構造工学論文集 50B 279 - 285 2004 [Refereed][Not invited]
  • OHYA Fumito, UEDA Masaiki, UCHIYAMA Takeshi, KIKUCHI Masaru
    Journal of structural engineering. B 一般社団法人日本建築学会 50B 269 - 277 0910-8033 2004 [Refereed][Not invited]
     
    The use of flat-plate structures will increase in the future because this type of structure can realize optimum and flexible space utilization. In the application of flat-plate structures, slab resonance should be an important consideration, because of potential problems such as incorrect operation of equipment in manufacturing facilities or occupant discomfort in residential structures. However there are few studies on the free vibration analysis of slabs within flat-plate structures. In this study the free vibration analyses of plates with columns resting on lateral and rotational elastic edge support uniformly are carried out by use of the superposition method which based on Mindlin plate theory. In order to study the vibration properties of the plate, column size and plate thickness ratio are set up as evaluation parameters.
  • KOSHIKAWA Takeaki, UEDA Masaiki, WADA Toshinaga, KIKUCHI Masaru
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 69 (580) 69 - 76 1340-4202 2004 [Refereed][Not invited]
     
    The large deformation/post-peak behavior analysis method of concrete beams and columns considering bond-slip of reinforcement is developed. The analytical procedure is capable of predicting the response of concrete beams and columns under axial force and biaxial bending in the material and geometrical nonlinear domains, including post-peak behavior using the incremental arch length method. The paper gives an outline of the nonlinear analysis method which includes the effect of bond-slip of reinforcement to handle the large deformation region, and three numerical examples are given to illustrate the use of the proposed procedure.
  • 補強材の付着すべりを考慮したコンクリート梁部材の自由振動解析
    井上圭一, 菊地 優, 上田正生
    日本建築学会 構造系論文集 (580) 77 - 84 2004 [Refereed][Not invited]
  • 越川武晃, 齊藤隆典, 上田正生, 菊地 優
    コンクリート工学 年次論文集 日本コンクリート工学協会 26 (2) 37 - 42 1347-7560 2004 [Refereed][Not invited]
     
    本論文は,部材全長にわたるPC鋼材の付着すべり現象を考慮した,繰り返し荷重を受ける圧着型プレキャスト・プレストレストコンクリート(PCaPC)梁」柱部材の材料非線形解析法について報告するものである。本論においては更に,本解析結果と既往の実験結果との比較を通して,特に圧着接合面近傍におけるPC鋼材の抜け出し現象が,この種の部材の変形挙動に及ぼす影響についても考察されている。
  • OHYA Fumito, UEDA Masaiki, UCHIYAMA Takeshi, KIKUCHI Masaru
    Journal of structural engineering. B 一般社団法人日本建築学会 49B 275 - 282 0910-8033 2003 [Refereed][Not invited]
     
    The use of flat-plate structures will increase in the future, because this type of structure can realize optimum and flexible space utilization. In the application of flat-plate structures, slab resonance should be an important consideration, because of potential problems such as incorrect operation of equipment in manufacturing facilities, or occupant discomfort in residential structures. However, there are few studies on the free vibration analysis of slabs within flat-plate structures. In this study, free vibration analyses of plates with columns resting all-edges-simply-supported and all-edges-clamped are performed by using the superposition method which based on Mindlin plate theory. In order to study the vibration properties of the plate, column size and plate thickness ratio are set up as evaluation parameters.
  • KIKUCHI Masaru, KITAMURA Yoshihisa, INOUE Keiichi, UEDA Masaiki
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 68 (565) 63 - 71 1340-4202 2003 [Refereed][Not invited]
     
    For the purpose of accurately predicting the seismic response of an isolated building, an analytical model for seismic isolation devices with hysteretic damping is proposed. The proposed model is capable of well-predicting the force-displacement relationships of various different types of devices, high-damping rubber bearings, lead-rubber bearings, and two types of steel dampers. Seismic response analyses are conducted to study the effectiveness of both existing models and the proposed model. The responses given by the existing models are mostly conservative. This fact indicates that the proposed model can be used to evaluate the performance of isolation devices accurately and effectively.
  • やじろべえ型免震構造（SFS21）の開発
    堀 富博, 真瀬伸治, 磯田和彦, 猿田正明, 北村佳久, 佐武直紀, 菊地 優
    日本建築学会 技術報告集 (17) 107 - 112 2003 [Refereed][Not invited]
  • MIZUNO Masae, UEDA Masaiki, KIKUCHI Masaru, UCHIYAMA Takeshi
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 68 (569) 55 - 63 1340-4202 2003 [Refereed][Not invited]
     
    This paper deals with the material nonlinear analysis of reinforced concrete slabs considering the effect of bond slip of reinforcement. Only a small number of studies have been reported in the literature that approximately consider the effect of reinforcement bond slip in two-way reinforced concrete slabs, and almost no cases are found in which material nonlinear analysis is used to rigorously consider the effect. In this paper a potential energy functional is first derived, and then a finite element formulation of the problem is implemented. In order to verify the analytical method five numerical examples are given and the results compared with experimental results.
  • 越川武晃, 上田正生, 和田俊良, 菊地 優
    コンクリート工学 年次論文集 日本コンクリート工学協会 25 (2) 445 - 450 1347-7560 2003 [Refereed][Not invited]
     
    本論文は,個々の梁要素内では微小変形を保持しながら,部材全体として大変形領域をも容易に取り扱うことが可能な,補強材の付着すべりを考慮した2軸曲げを受けるコンクリート梁部材の材料非線形解析手法について報告するものである。本論では,まず本解析法の定式化の概要について示されており,次いで既往の実験結果との比較により,本解析法の妥当性が検証されている。
  • Seismic Isolation of a Building with Large Eccentricity
    Y. Kitamura, M. Kikuchi, H. Nakashima, K. Nakagawa
    SEWC2002 Structural Engineers World Congress 2002 [Refereed][Not invited]
  • Seismic Behavior of a Reinforced Concrete Building due to Large Vertical Ground Motions in Near-Source Regions
    M. Kikuchi, K. Dan, K. Yashiro
    Proceedings of the 12th World Conference on Earthquake Engineering (1876) 2000 [Refereed][Not invited]
  • KIKUCHI Masaru, KITAMURA Yoshihisa, HAYASHI Shoji, KAWASHIMA Yoichi, SAKAGUCHI Toru, YAMADA Chikafumi
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 64 (524) 57 - 64 1340-4202 1999 [Refereed][Not invited]
     
    This paper describes the vertical behavior of elastomeric isolation bearings. A study consists of three phases. In the first phase, dynamic loading tests are conducted. Two types of high-damping rubber bearings which differ in thickness of flange-plates are used. Second, finite element analyses are performed to simulate the test results. Both the tests and the analysis results show that the flange-plates has significant effect on tension modulus. Third, a hysteresis model is proposed. Good agreement between the experimental and the analysis results shows that the model can be an effective numerical tool to predict the seismic response of isolated buildings.
  • 菊地 優, 田村和夫, 北村佳久
    第10回日本地震工学シンポジウム論文集 235 - 240 1998 [Refereed][Not invited]
  • Masaru Kikuchi, Ian D. Aiken
    EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 26 (2) 215 - 231 0098-8847 1997/02 [Refereed][Not invited]
     
    For the purpose of accurately predicting the seismic response of base-isolated structures, an analytical hysteresis model for elastomeric seismic isolation bearings is proposed. An extensive series of experimental tests of four types of seismic isolation bearings--two types of high-damping rubber bearings, one type of lead-rubber bearing and one type of silicon rubber bearing--was carried out with the objective of fully identifying their mechanical characteristics. The proposed model is capable of well-predicting the mechanical properties of each type of elastomeric bearing into the large strain range. Earthquake simulator tests were also conducted after the loading tests of the individual bearings. In order to show the validity of the proposed model, non-linear dynamic analyses were conducted to simulate the earthquake simulator test results. Good agreement between the experimental and analytical results shows that the model can be an effective numerical tool to predict not only the peak response value but also the force-displacement relationship of the isolators and floor response spectra for isolated structures.
  • KIKUCHI Masaru, DAN Kazuo, JOH Osamu, GOTO Yasuaki, TANAKA Hideo, YASHIRO Kazuhiko
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 62 (495) 53 - 62 1340-4202 1997 [Refereed][Not invited]
     
    Four buildings at the Kushiro Technical High School, damaged in the 1993 Kushiro-Oki and the 1994 Hokkaido-Toho-Oki earthquakes, were modeled as an assembly of nonlinear elements to verify our present techniques for earthquake-resistant design of structures. The input motions were independently evaluated based on the strong motions recorded on the ground at the Kushiro District Meteorological Observatory, 2km west of the school, and the soil-structure interaction was taken into account. The results of the dynamic response analysis showed a good agreement with the detail of different degree of the damage to the four buildings.
  • DAN Kazuo, KIKUCHI Masaru, FUKUKITA Akira, NISHIMURA Isao
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 62 (495) 45 - 52 1340-4202 1997 [Refereed][Not invited]
     
    A very large acceleration of 1.6 g was observed on the first floor of the Meiwa Elementary School, Hokkaido, during the largest aftershock of the 1993 Hokkaido-Nansei-Oki earthquake. In order to investigate the cause of this very large acceleration, this paper described the building three-dimensionally as an assembly of nonlinear elements because its plan was not a simple rectangle, and then the base-rock motions were estimated at a depth of 8.6 m after evaluating the soil-structure interaction. The resultant base-rock motions made it clear that the large acceleration of 1.6 g was ascribed mainly to the amplification factor of up to 30 at about 4 Hz from the base rock to the first floor of the building.
  • Dynamic Response Analyses of Reinforced Concrete Buildings damaged in the 1993 Kushiro-oki Earthquake of M7.8 in Japan
    K. Dan, M. Kikuchi
    Proceedings of the 11th World Conference on Earthquake Engineering (1164) 1996 [Not refereed][Not invited]
  • 菊地 優, 林 章二, 渡辺弘之
    構造工学論文集 41B 69 - 78 1995 [Refereed][Not invited]
  • KIKUCHI Masaru, TAMURA Kazuo, WADA Akira
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 60 (470) 65 - 73 1340-4202 1995 [Refereed][Not invited]
     
    This paper describes a series of seismic fragility analyses of base-isolated structures considering non-linear superstructure behavior. The Latin hypercube sampling technique is applied to construct a series of samples that explicitly account for non-Linear behavior. Fragility curves are generated that evaluate the limit state based on maximum superstructure ductility ratio. The study shows that base-isolation systems have a significant advantage for seismic protection compared with fixed-base structures. However, careful consideration should be given to the fact that plastic deformation demands on the superstructure can increase dramatically after yielding if the super-structure is designed anticipating a reduced seismic lateral shear force.
  • 菊地 優, 猿田正明, 田村和夫
    構造工学論文集 40B 177 - 188 1994 [Refereed][Not invited]
  • 免震構造物のエネルギー応答に関する実験的研究
    菊地 優, 猿田正明, 田村和夫
    第9回日本地震工学シンポジウム論文集 1813 - 1818 1994 [Refereed][Not invited]
  • 免震・防振システムの振動特性に関する実験的研究
    林 章二, 菊地 優, 渡辺弘之, 芳沢利和, 福田 健
    第9回日本地震工学シンポジウム論文集 1807 - 1812 1994 [Refereed][Not invited]
  • 1976年中国唐山地震（M7.8）によって被害を受けた煙突の挙動シミュレーション
    壇 一男, 渡辺宏一, 菊地 優
    第9回日本地震工学シンポジウム論文集 679 - 684 1994 [Refereed][Not invited]
  • KIKUCHI Masaru, SARUTA Masaaki, TAMURA Kazuo, KELLY James M., AIKEN lan D., CLARK Peter W.
    Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 59 (462) 69 - 78 1340-4202 1994 [Refereed][Not invited]
     
    This paper describes earthquake simulator tests of a 1/2.5-scale model of an existing base-isolated, three-story reinforced-concrete building. Two types of high-damping rubber bearings and one type of lead-rubber bearing were used in these tests. Moderate and extreme input motions were applied to the model to study the ultimate behavior of the isolated structure. Dynamic analyses were conducted to simulate the response to both moderate and extreme input tests, using a previously-developed analytical model. Good agreement between the experimental and analytical results was obtained, and the analytical model was confirmed to be suitable for representing the mechanical properties of bearings.
  • Design- and Ultimate-Level Earthquake Tests of a 1/2.5-scale Base-Isolation Reinforced-Concrete Building
    Ian D. Aiken, Peter W. Clark, M. Kikuchi
    Proceedings of Seminar on Seismic Isolation, Passive Energy Dissipation, and Active Control, ATC 17-1 1 281 - 292 1993 [Refereed][Not invited]
  • DAN Kazuo, WATANABE Koichi, KIKUCHI Masaru, EBIHARA Manabu
    Journal of structural and construction engineering 一般社団法人日本建築学会 (454) 51 - 60 0910-8025 1993 [Refereed][Not invited]
     
    The strong-motion records at the Kushiro District Meteorological Observatory from the 1993 Kushiro-Oki earthquake were applied to rigid-frame structures of different types. The total plastic energy dissipation of short period structures under the records was larger than that under the design input motions, while the energy dissipation of long period structures was comparable or smaller. The response level-of a low building with a short natural period showed that the damage should be moderate or severe. But, the actual damage to such a kind of buildings was rather slight around the observatory. The earthquake resistant capacity of non-structural components should be appropriately evaluated in design process.
  • ID AIKEN, JM KELLY, PW CLARK, K TAMURA, M KIKUCHI, T ITOH
    PROCEEDINGS OF THE TENTH WORLD CONFERENCE ON EARTHQUAKE ENGINEERING, VOLS 1-10 2281 - 2286 1992 [Refereed][Not invited]

Books etc

  • 大振幅地震動に対する免震構造の設計
    (Contributor)
    (5) 日本建築学会 2020
  • Limongelli, Maria Pina, Çelebi, Mehmet (Contributor)
    Springer 2019 (ISBN: 9783030139759) xii, 447 p.
  • 免震・制震ハンドブック
    日本免震構造協会 (Joint editor)
    2014/07
  • 免震構造設計指針
    日本建築学会 (Contributor)
    2013/10
  • 長周期地震動と建築物の耐震性
    菊地 優 (Contributor)
    日本建築学会 2007

Conference Activities & Talks

  • 多様な地震動に備える免震構造  [Invited]
    菊地 優
    第13回振動技術展  2022/02
  • 繰り返し載荷を受ける免震部材の熱力学連成挙動  [Invited]
    菊地優
    日本建築学会近畿支部シンポジウム「巨大地震に備えて免震・制振技術に期待すること」  2019/11
  • 免震建築の現状と将来展望  [Invited]
    菊地 優
    自動車技術会関東支部  2019/01
  • 巨大地震に備える免震構造  [Invited]
    菊地 優
    日本振動技術協会講演会  2018/01
  • 免震建築の現状の課題と将来展望  [Invited]
    菊地 優
    第17回免震フォーラム  2017/12
  • 免震構造の実態性能と社会の評価  [Invited]
    菊地 優
    第4回損害保険鑑定人フォーラム  2017/11
  • An Advanced Hysteresis Model of High-Damping Rubber Bearings for Seismic Isolation  [Invited]
    KIKUCHI Masaru
    16th Scientific Conferernce of the memory of Professor Danilovsky  2017/10
  • Why do we need seismic isolation?  [Invited]
    KIKUCHI Masaru
    16th Scientific Conferernce of the memory of Professor Danilovsky  2017/10
  • 構造工学が担う建築歴史遺産の継承  [Invited]
    菊地 優
    第63回構造工学シンポジウム  2017/04
  • Vibration Control Technologies for Building Structures in Japan  [Invited]
    KIKUCHI Masaru
    New Idea of New Century, Pacific National University, Khabarovsk, Russia  2017/02
  • 大振幅地震動に備える免震構造  [Invited]
    菊地 優
    JSCA北海道支部功労賞受賞記念講演会  2016/11
  • Seismic Isolation Devices, Principle and application of SI devices, introduction of examples  [Invited]
    KIKUCHI Masaru
    Three Days Semiar on Seismic Isolation in Turkey, Ankara, Turkey  2016/03
  • 免震構造物の多次元地震時挙動  [Invited]
    菊地 優
    耐震工学研究会  2015/07
  • 免震構造の現状と今後  [Invited]
    菊地 優
    鳥取発 免震・スマートハウス研究会  2015/03
  • Seismic Isolation Technology in Japan  [Invited]
    KIKUCHI Masaru
    Seminar on Construction Technology in Hokkaido, Sakhalin region Government, Yuzino-Sakhalinsk, Russia  2014/10
  • Seismic Isolation in the 2011 Tohoku Earthquake  [Invited]
    KIKUCHI Masaru
    RFS Seminar, PEER Center, University of California, Berkeley, USA  2012/11
  • 東日本大震災から学ぶ免震構造のあり方  [Invited]
    菊地 優
    第15回免震フォーラム  2012/08
  • 建築物の免震について－免震に関する最新の話題－  [Invited]
    菊地 優
    札幌建築クラブ講演会  2010/06
  • 未来に残したい歴史的建築物～地震から守るために～  [Invited]
    菊地 優
    日本建築家協会北海道支部  2009/12
  • 免震構造の最新技術開発トレンド  [Invited]
    菊地 優
    日本免震構造協会  2008/11
  • プレート境界の巨大地震－2003年十勝沖地震から何を学ぶか  [Invited]
    菊地 優
    自然災害研究防災フォーラム  2006/03
  • 振動制御による耐震改修と地震防災  [Not invited]
    菊地 優
    JSCA北海道支部  2006/03

MISC

Industrial Property Rights

  • 特開2004-52275:ペデスタルデッキ、及びペデスタルデッキの構築方法  2004/02
    菊地優, 福喜多 輝, 猿田正明
  • 特開2002-188688:３次元免震装置  2002/07
    櫻井衛, 須原淳二, 太田和也, 岡田康男, 田村和夫, 猿田正明, 菊地優
  • 特開2000-080819:免震装置の取付構造  2000/03
    菊地優, 北村佳久, 斎藤豊

Awards & Honors

  • 2020 The Japan Society of Seismic Isolation The 20th Prizes of the Japan Society of Seismic Isolation, ENGINEERING AWARD
     巨大地震に対するフェイルセーフ機構を有するアイソレータ「QTB」の開発 
    受賞者: 濱口弘樹;山本俊司;和氣知貴;石井建;菊地優
  • 2019/10 大成学術財団選奨 金賞（論文）
     高摩擦すべり支承の熱・力学連成挙動解析システムの開 
    受賞者: 菊地優
  • 2015 Architectural Institute of Japan AIJ Prize
     Research on improved seismic response analysis methods for seismically-isolated structures 
    受賞者: Masaru Kikuchi
  • 2010 日本機械学会動力エネルギーシステム部門貢献表彰
  • 2005 The Japan Society of Seismic Isolation The 20th Prizes of the Japan Society of Seismic Isolation, ENGINEERING AWARD
     履歴減衰型免震部材の統一的復元力モデルの開発 
    受賞者: 菊地優;山本祥江;北村佳久;猿田正明;田村和夫

Research Grants & Projects

  • 文部科学省：科学研究費補助金（基盤研究(A)）
    Date (from‐to) : 2019/04 -2022/03 
    Author : 菊地 優
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2018/10 -2019/03 
    Author : Takahashi Hiroaki
     
    Comprehensive investigation on the 2018 Hokkaido Eastern Iburi earthquake and its disaster was conducted. Mainshock rupture initiated at deepest part and major slip was occurred in 20-30km deep. Multiple simultaneous landslides in Atsuma town was induced by combination of strong ground shaking and weak sliding layer between pyroclastic fall deposit layers. Halloysite cray minerals was discovered in all sliding layers. Simulation suggested landslides might attack residential houses within 6 seconds. Observed peak ground motions in nearby area were larger than common distance attenuation model. Severe wooden house damage in Mukawa town was due to amplified seismic waves due to site effects. Sounding and boring investigation revealed filled low-density volcanic ash and higher groundwater level in liquefaction area. Electricity blackout caused severe damage in social and economic activities of Hokkaido. These scientific outcomes were explained to residents at public briefing session.
  • 大成学術財団：研究助成
    Date (from‐to) : 2017/10 -2019/03 
    Author : 菊地 優
  • 巨大地震に対するRCパッシブ制振建物－地盤連成系の非線形最適制御設計法の開発
    文部科学省：科学研究費補助金（基盤研究（C））
    Date (from‐to) : 2016/04 -2019/03 
    Author : 白井和貴
  • 廃タイヤ活用による構造物高耐震化システムの開発
    文部科学省：科学研究費補助金（挑戦的萌芽研究）
    Date (from‐to) : 2016/04 -2019/03 
    Author : 菊地 優
  • 文部科学省：科学研究費補助金（基盤研究(A)）
    Date (from‐to) : 2015/04 -2018/03 
    Author : 菊地 優
  • OpenSeesを用いた免震構造極限挙動解析システムの構築
    日本免震構造協会：免震構造・制振構造に関わる研究助成
    Date (from‐to) : 2014/04 -2015/03 
    Author : 菊地 優
  • 風応答長期観測記録に基づく塔状構造物の動特性変動の定量化
    文部科学省：科学研究費補助金（挑戦的萌芽研究）
    Date (from‐to) : 2011/04 -2014/03 
    Author : 菊地 優
  • 文部科学省：科学研究費補助金（基盤研究(B)）
    Date (from‐to) : 2011/04 -2014/03 
    Author : 菊地 優
  • 免震部材の多軸連成力学モデルの開発
    日本免震構造協会：免震構造・制振構造に関わる研究助成
    Date (from‐to) : 2011/04 -2012/03 
    Author : 菊地 優
  • 原子力施設用配管の耐震裕度評価法と耐震性向上技術に関する開発
    経済産業省：革新的実用原子力技術開発費補助事業
    Date (from‐to) : 2008/04 -2011/03 
    Author : 中村 孝
  • 文部科学省：科学研究費補助金（基盤研究(B)）
    Date (from‐to) : 2008/04 -2011/03 
    Author : 菊地 優
  • シナリオ地震による都市直下型地震の強震動予測に基づく既存建築物の耐震性能の評価
    文部科学省：科学研究費補助金（基盤研究(C)）
    Date (from‐to) : 2006/04 -2008/03 
    Author : 菊地 優
  • 北海道の地震環境に基づく歴史的建造物の戦略的保存再生法に関する研究
    文部科学省：科学研究費補助金（基盤研究(C)）
    Date (from‐to) : 2004/04 -2006/03 
    Author : 菊地 優

Educational Activities

Teaching Experience

  • Advanced Structural Design
    開講年度 : 2021
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 建築構造，地震，振動，免震，制震，制振，耐震補強
  • Building Structural Design
    開講年度 : 2021
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : earthquake engineering, building structure, vibration control, seismic isolation, energy dissipation, dynamic response, dynamic analysis, shake table test
  • Inter-Graduate School Classes(Educational Program):RJE3
    開講年度 : 2021
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 建築デザイン、都市デザイン、建築構造デザイン、土木デザイン、環境デザイン
  • Advanced Structural Design
    開講年度 : 2021
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 建築構造，地震，振動，免震，制震，制振，耐震補強
  • Building Structural Design
    開講年度 : 2021
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : earthquake engineering, building structure, vibration control, seismic isolation, energy dissipation, dynamic response, dynamic analysis, shake table test
  • Descriptive Geometry
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 図形，製図，投象，切断，相貫，陰影，正投象，軸測投象，斜投象，透視投象
  • Basic Graphic Science
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 図形，製図，投象，切断，相貫，陰影，正投象，軸測投象，斜投象，透視投象
  • Applied Graphic Science
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 図形，製図，投象，切断，相貫，陰影，軸測投象，斜投象，透視投象
  • Exercise in Structural Design
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 簡略構造計算、木造、鉄筋コンクリート構造、鉄骨造、構造模型、構造デザインプレゼンテーション
  • Structural Mechanics III
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 構造力学，構造解析，行列計算，マトリックス変位法，有限要素法，トラス，梁
  • Structural Analysis
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 建築構造，構造解析，プログラミング、数値計算
  • Structural Analysis II
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 建築構造，構造解析，プログラミング、数値計算
  • Reinforced Concrete Structures
    開講年度 : 2021
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 鉄筋コンクリート構造　構造設計　せん断　曲げ　付着　材料、基礎構造

Committee Membership

  • 2020/07 - Today   The Japan Society of Seismic Isolaiton   Director
  • 2020/06 -2022/05   Architectural Institute of Japan   Chief of Hokkaido Chapter

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