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Ishii Ken

Faculty of Engineering　Architecture　Research Group of Structural Engineering and MaterialsAssistant Professor

Researcher basic information

■ Degree
  • 博士(工学), 北海道大学
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 50840550
J-Global ID■ Research Keywords and Fields
Research Keyword
  • Structural Engineering
  • Seismic Isolation
Research Field
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Building structures and materials, Seismic Isolation
■ Educational Organization

Research activity information

■ Papers
■ Other Activities and Achievements
■ Lectures, oral presentations, etc.
  • Pareto Front of Seismic Response of SDOF Systems Considering a Trade-off Between Displacement and Acceleration Under Sinusoidal Ground Motions
    Ken Ishii; Masaru Kikuchi
    19WCSI, 16 Sep. 2025
    15 Sep. 2025 - 19 Sep. 2025
  • Dynamic Characteristics of Seismic Isolation with Quasi-Zero Stiffness, Rotational Inertia
    Jun Iba; Koichi Watanabe; Kou Miyamoto; Ken Ishii; Masaru Kikuchi
    SEISMIC ISOLATION, ENERGY DISSIPATION AND ACTIVE VIBRATION CONTROL OF STRUCTURES, 18-WCSI 2024, VOL 1, 2024, English
    2024 - 2024
  • Mechanical behavior of sliding bearings for seismic isolation under cyclic loading
    Ken Ishii; Masaru Kikuchi
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia, Jul. 2019, English
    Jul. 2019 - Jul. 2019
  • New Evaluation Formulae for Shear Strength of Lead-Rubber Bearings
    Wake Tomotaka; Masaru Kikuchi; Ken Ishii
    16th World Conference on Seismic Isolation, Energy Dissipation and Regulation of Dynamic Characteristics of Structures, Saint-Petersburg, Russia, Jul. 2019, English
    Jul. 2019 - Jul. 2019
  • 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, Apr. 2019, English
    Apr. 2019 - Apr. 2019
  • An Advanced Hysteresis Model of High-Damping Rubber Bearings for Seismic Isolation
    Masaru Kikuchi; Ken Ishii
    Proceedings of the 7th Structural Engineers World Congress 2019, Istanbul, Turkey, Apr. 2019, English
    Apr. 2019 - Apr. 2019
  • Thermal-mechanical coupled behavior of sliding bearings for seismic isolation
    M. Kikuchi; K. Ishii
    NME 2018, 28 Aug. 2018, English, Oral presentation
    Ghent, Belgium, [International presentation]
  • Thermal-Mechanical Coupled Behavior of Sliding Bearings for Seismic Isolation
    Masaru Kikuchi; Ken Ishii
    1st International Conference on Numerical Modelling in Engineering, Ghent, Belgium, Aug. 2018, English
    Aug. 2018 - Aug. 2018
  • Thermal-mechanical coupled behavior of elastomeric isolation bearings under cyclic loadings
    M. Kikuchi; K. Ishii
    16ECEE, 18 Jul. 2018, English, Oral presentation
    Thessaloniki, Greece, [International presentation]
  • Thermal-Mechanical Coupled Behavior of Elastomeric Isolation Bearings Under Cyclic Loading
    Masaru Kikuchi; Ken Ishii
    16th European Conference on Earthquake Engineering, Thessaloniki, Greece, Jun. 2018, English
    Jun. 2018 - Jun. 2018
  • Analytical study on the seismic retrofitting of a historic reinforced concrete temple using friction dampers
    K. Shirai; M. Kikuchi; T. Ito; K. Ishii
    PROHITECH´17, 12 Jul. 2017, English, Oral presentation
    Lisbon, Portugal, [International presentation]
  • Seismic response analysis considering the thermal-mechanical coupled behavior of lead rubber bearings
    K. Ishii; M. Kikuchi; Y. Kuroshima
    EMI 2017, 04 Jul. 2017, English, Oral presentation
    San Diego, USA, [International presentation]
  • Numerical model for low-shear modulus high-damping rubber isolation bearing under large shear deformation
    M. Kikuchi; K. Ishii; H. Kato; M. Nakamura
    EMI 2017, 04 Jul. 2017, English, Oral presentation
    San Diego, USA, [International presentation]
  • Horizontal biaxial loading tests on sliding lead rubber bearing system
    M. Yamamoto; H. Hamaguchi; M. Kikuchi; K. Ishii; T. Wake
    NZSEE 2017, 27 Apr. 2017, English, Oral presentation
    Wellington, New Zealand, [International presentation]
  • Strength degradation in lead-rubber bearings during a long-duration earthquake
    T. Wake; M. Kikuchi; K. Ishii
    NZSEE 2017, 27 Apr. 2017, English, Oral presentation
    Wellington, New Zealand, [International presentation]
  • Strength Degradation on Lead-Rubber Bearings during a Long-duration Earthquake
    T. Wake; M. Kikuchi; K. Ishii
    2017 NZSEE Conference, 2017, English
    2017 - 2017
  • 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, English
    2017 - 2017
  • Evaluation of long-term variation of dynamic properties of a tall reinforced concrete tower with tuned liquid dampers
    K. Ishii; M. Kikuchi
    HKICEAS 2013, 19 Dec. 2013, English, Oral presentation
    Hong Kong, China, [International presentation]
  • Three-dimensional mechanical model for circular multilayered elastomeric bearings considering compression modulus distribution on the rubber pad
    K. Ishii; M. Kikuchi
    13WCSI, 24 Sep. 2013, English, Oral presentation
    Sendai, Japan, [International presentation]
  • Structural characteristics of a historical reinforced concrete temple building, Higashi-Honganji Hakodate Betsuin
    K. Ishii; M. Kikuchi; K. Shirai
    EASEC-13, 11 Sep. 2013, English, Oral presentation
    Sapporo, Japan, [International presentation]
  • Three-dimensional Mechanical Model for Circular Multilayered Elastomeric Bearings Considering Compression Modulus Distribution on the Rubber Pad
    Ken Ishii; Masaru Kikuchi; Yoriko Suzuki
    13th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures, Sendai, Japan, Sep. 2013, English
    Sep. 2013 - Sep. 2013
  • Structural Characteristics of a Historical Reinforced Concrete Temple Building, Higashi-Honganji Hakodate Betsuin
    Ken ISHII; Masaru KIKUCHI; Kazutaka SHIRAI
    13th East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-13), Sep. 2013, English
    Sep. 2013 - Sep. 2013
  • Behavior of sliding rubber bearings under horizontal bidirectional loadings
    M. Yamamoto; S. Minewaki; N. Kamoshita; M. Kikuchi; K. Ishii; O. Kouchiyama; T. Namamura
    15WCEE, 24 Sep. 2012, English, Poster presentation
    Lisbon, Portugal, [International presentation]
  • Seismic response analysis of seismically isolated buildings with multilayered elastomeric bearings considering rocking behavior
    K. Ishii; M. Kikuchi; K. Shirai
    15WCEE, 24 Sep. 2012, English, Poster presentation
    Lisbon, Portugal, [International presentation]
  • Response modification factor for the design of seismically isolated buildings
    S. Kitayama; K. Ishii; M. Kikuchi
    15WCEE, 24 Sep. 2012, English, Oral presentation
    Lisbon, Portugal, [International presentation]
  • Dynamic properties of a tall reinforced concrete tower with tuned liquid dampers
    M. Kikuchi; K. Ishii; Y. Suzuki
    ACEM'12, 26 Aug. 2012, English, Oral presentation
    Seoul, Korea, [International presentation]
  • 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, Aug. 2012, English
    Aug. 2012 - Aug. 2012
  • 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, English
    2012 - 2012
  • Behavior of Sliding Rubber Bearings under Horizonal Bidirectional Loadings
    M. Yamamoto; S. Minewaki; N. Kamoshita; M. Kikuchi; K. Ishii; O. Kouchiyama; T. Nakamura
    Proceeding of the 15th World Conference on Earthquake Engineering, 2012, English
    2012 - 2012
  • Seismic Response Analysis of Seismically Isolated Buildings with Multilayered Elastomeric Bearings Considering Rocking Behavior
    Ken ISHII; Masaru KIKUCHI; Kazutaka SHIRAI
    Proceedings of the 15th World Conference on Earthquake Engineering (15WCEE), 2012, English
    2012 - 2012
  • Biaxial horizontal response for a seismically-isolated building with high-damping rubber bearings
    M. Yamamoto; M. Kikuchi; K. Ishii; H. Yoneda; S. Minewaki; H. Kato
    12WCSI, 20 Sep. 2011, English, Oral presentation
    Sochi, Russia, [International presentation]
  • Three dimensional analysis for square seismic isolation bearings under large shear deformation and high axial loads
    M. Kikuchi; K. Ishii; T. Nakamura; I. Aiken
    5th ICEE, 03 Mar. 2010, English, Oral presentation
    Tokyo, Japan, [International presentation]
■ Syllabus
  • 建築構造設計演習, 2024年, 学士課程, 工学部
  • 構造力学Ⅲ, 2024年, 学士課程, 工学部
  • 構造解析, 2024年, 学士課程, 工学部
  • 構造解析Ⅱ, 2024年, 学士課程, 工学部
■ Affiliated academic society
  • ARCHITECTURAL INSTITUTE OF JAPAN
■ Research Themes
  • Improving the Resilience of Seismic Isolation Systems Against Multi-Hazard Natural Disasters
    Grants-in-Aid for Scientific Research
    01 Apr. 2024 - 31 Mar. 2027
    菊地 優; 石井 建
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24K01019
  • Development of next-generation high-performance seismic isolation system to prepare for earthquake ground motions with various properties
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2022
    Kikuchi Masaru
    In this work, we proposed a seismic isolation system that harnesses cutting-edge seismic isolation technology to form an effective structural system for earthquake disaster prevention. Our aim is to create a seismic isolation structure that is sufficiently robust to a variety of ground motions, such as long-period motions caused by mega subduction earthquakes and large-amplitude pulse-like motions caused by inland earthquakes. We developed two high-performance isolation systems: a highly durable isolation system that can maintain operation even for large and repeated deformations, and a displacement-controlled isolation system that can reduce acceleration without exceeding the deformation limit even for large-amplitude seismic ground motions. The proposed systems will form a vital part of the next-generation structural systems for future earthquake disaster prevention.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 19H00788
  • Analysis model for seismic sliding bearings considering various dependencies
    Grants-in-Aid for Scientific Research
    30 Aug. 2019 - 31 Mar. 2021
    Ishii Ken
    This research developed numerical models for seismic sliding bearings considering pressure-velocity-temperature dependencies. Mechanical model and thermal conductivity analysis model are separately produced, and are combined together in the numerical analysis.
    Using the developed model, thermal-mechanical coupled behavior analyses were performed. Effect of arrangements of sliding materials on temperature rise of the devices was evaluated by simulation analysis results.
    Japan Society for the Promotion of Science, Grant-in-Aid for Research Activity Start-up, Hokkaido University, 19K23546
  • 複合応力状態における免震積層ゴムの終局挙動解析法に関する研究
    科学研究費助成事業
    2012 - 2013
    石井 建
    本研究では、複合応力下における免震積層ゴムの力学挙動解析法を開発した。これは、免震建物の水平二方向応答特性や大変形時の軸力変動によって生じる免震積層ゴムの座屈特性の変化などを精緻に再現することで、多方向から地震入力を受ける免震建物の応答特性をより正確に把握しようとするものである。本年度は、主として下記の3点について取り組んだ。
    1 免震装置のモデル化
    鉛プラグ入り積層ゴムについて、丸型ゴムを対象とした定式化を用いて、高軸力が作用した際の大変形時座屈特性を良好に表現する力学モデルを作成した。また、定式化において適用可能な近似式を示した。弾性滑り支承について、軸力と水平二方向復元力の連成効果に面圧依存性を取り入れた力学モデルを作成した。高減衰積層ゴムについて、水平二方向加力時に生じるねじれ変形の影響を考慮した力学モデルを作成した。これらを用いて、静的加力実験のシミュレーション解析や地震応答解析を行った。
    2 免震建物の地震応答解析
    免震建物の数値計算モデルを作成して地震応答解析を行い、建物のロッキング挙動が生じた場合や免震層の構造パラメータが変動した場合の応答値の変動について検証した。積層ゴムを用いた免震建物では、ロッキング挙動下での地震応答において、過度の座屈現象の進展が回避されるという応答特性を持つことを示した。また、免震部材の不確定パラメータを考慮したうえで、免震建物のロバスト安定性を数値的に判断する手法を提案した。
    3 計算プログラムのオープンソース化
    免震積層ゴムの復元力モデルおよび力学モデルを、オープンソース形式で構造解析プログラムの開発を行っているOpen Sees (Open System for Earthquake Engineering Simulation)に提供した。計算プログラムはウェブ上で公開されており、誰でもダウンロードして使用することが可能である。
    日本学術振興会, 特別研究員奨励費, 北海道大学, 12J01584