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Sato Motohiro

Faculty of Engineering　Mechanical and Aerospace Engineering　Mechanics and MaterialsProfessor

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
J-Global ID■ Research Keywords and Fields
Research Keyword
  • パイプインパイプ
  • カーボンナノチューブ
  • 海洋パイプライン
  • 座屈
  • 複合構造
  • 応力集中
  • 微生物
  • 自然エネルギー
  • 粒状体材料
  • 曲げ特性
  • 曲げ変形
  • 粒子法
  • 個別要素法
  • パイプインパイプシステム
  • 劣化
  • 再生骨材
  • パイプライン
  • 合成構造
  • 靭性能
  • フレキシブルパイプインパイプ
  • 防災
  • コスト縮減
  • 構造工学
  • 山岳トンネル
  • 凍土
  • 寒冷地工学
  • 活動層
  • 温度解析
  • 支保構造物
  • 温度依存性
Research Field
  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering), Mechanics of materials and materials
  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering), Marine engineering
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Safety engineering
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Social systems engineering
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Civil engineering material, execution and construction management
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Structure engineering and earthquake engineering
■ Educational Organization

Career

■ Career
Career
  • Apr. 2023 - Present
    北海道大学大学院工学研究院 副研究院長（研究担当）
  • Apr. 2019 - Present
    北海道大学大学院, 工学研究院 機械・宇宙航空工学部門, 教授
  • Feb. 2012 - Mar. 2019
    北海道大学大学院, 工学研究院 北方圏環境政策工学部門, 准教授
  • Jun. 2017 - Sep. 2017
    University of Cambridge, Visiting Academic Fellow
  • Jun. 2016 - Sep. 2016
    Incheon National University, Visiting Professor
  • Apr. 2007 - Jan. 2012
    Hokkaido University, Graduate School of Engineering, 助教
  • Sep. 2010 - Mar. 2011
    Imperial College London, Visiting lecturer
  • Apr. 2002 - Mar. 2007
    Hokkaido University, Graduate School of Engineering, 助手
  • Sep. 2005 - Aug. 2006
    Cranfield Uniersity, Visiting Researcher
Educational Background
  • Apr. 1999 - Mar. 2002, 北海道大学大学院, 工学研究科社会基盤工学専攻 博士後期課程
  • Apr. 1997 - Mar. 1999, 北海道大学大学院, 工学研究科社会基盤工学専攻 修士課程
  • Oct. 1995 - Mar. 1997, Hokkaido University, School of Engineering, Department of Civil Engineering
  • Apr. 1993 - Sep. 1995, Hokkaido University, 教養部理Ⅰ系
  • Apr. 1990 - Mar. 1993, 北海道札幌北高等学校
Committee Memberships
  • Apr. 2022 - Present
    北海道企業局 総合評価検討会委員
  • Oct. 2019 - Present
    北海道財務局, 国有財産北海道地方審議会委員, Government
  • Apr. 2018 - Present
    北海道小樽建設管理部, 総合評価検討会委員, Autonomy
  • Jan. 2018 - Present
    東日本高速道路（株）北海道支社, 狩勝第二トンネル土石流対策検討会, Others
  • Jan. 2016 - Present
    北海道札幌建設管理部, 総合評価審査委員会委員, Autonomy
  • Nov. 2015 - Present
    鉄道・運輸機構, 北海道新幹線冬季対策委員会委員・幹事, Others
  • Apr. 2013 - Present
    東日本高速道路（株）北海道支社, トンネル技術検討会委員, Others
  • Jun. 2012 - Present
    道路管理技術センター, 道路管理技術委員会委員, Others
  • Jul. 2011 - Present
    Editorial Board, "Coupled Systems Mechanics(CSM)", An International Journal of Interactions of Structures, Fluids, Soil, Wind, Foundation and Multiple Systems, Society
  • Oct. 2009 - Present
    土木学会応用力学委員会, 委員, Society
  • Apr. 2002 - Present
    北海道土木技術会, 鋼道路橋研究委員会委員, Others
  • Apr. 2002 - Present
    北海道土木技術会, トンネル研究委員会委員, Others
  • Apr. 2013 - Mar. 2018
    北海道大学大学院工学研究院, 広報・情報管理室員, Others
  • Oct. 2015 - Mar. 2016
    札幌市, 道路トンネル補修計画検討会議委員, Autonomy
  • Apr. 2011 - Mar. 2013
    土木学会構造工学委員会, 構造工学論文集編集小委員会委員（構造力学・構造工学一般部門担当）, Society
  • Apr. 2008 - Dec. 2009
    日本鉄鋼連盟, 鋼構造ネットワーク北海道地区代表幹事, Others
  • May 2008 - Apr. 2009
    土木学会, 土木学会誌編集委員（特集担当）, Society
  • May 2005 - Apr. 2009
    土木学会, 北海道支部幹事, Society
  • Nov. 2004 - Oct. 2005
    平成15年（2003年）十勝沖地震検討会委員・幹事, Others
Position History
  • 大学院工学研究院副研究院長, 2023年4月1日 - 2025年3月31日

Research activity information

■ Awards
  • Dec. 2019, 文部科学省 科学技術・学術政策研究所, 科学技術への顕著な貢献2019（ナイスステップな研究者）
    竹が「軽さ」と「丈夫さ」を併せもつ理由の構造・材料力学的解明
    佐藤太裕
  • Jun. 2018, 土木学会, 土木学会論文賞
    竹の節・組織構造が織り成す円筒体としての合理的な構造特性の理論的解明
    佐藤太裕
  • Feb. 2016, Editors’ suggestion, Physical Review E
    佐藤太裕
  • Jan. 2016, IASTEM Excellent Paper Award
    佐藤太裕
  • Feb. 2014, 北海道科学技術奨励賞（北海道知事表彰）
    構造力学的手法を用いた新しい次世代型構造システムの研究開発
    佐藤太裕
  • Jul. 2010, Selected paper, International Conference on Modelling and Simulation 2010 in Prague
    佐藤太裕
  • Dec. 2008, （財）国際科学技術財団（Japan Prize）, 研究助成
    佐藤太裕
  • Apr. 2002, 土木学会北海道支部奨励賞
    佐藤太裕
  • Dec. 2000, 土木学会年次学術講演会優秀講演者表彰
    佐藤太裕
■ Papers
  • Large deflection analysis of an axially functionally graded hollow tapered beam under a uniformly distributed load
    Carol Lee Chalermsin; Motohiro Sato
    Journal of Mechanics, 41, 313, 321, Oxford University Press (OUP), 30 Aug. 2025, [Peer-reviewed], [Last author, Corresponding author]
    Scientific journal, Abstract

    Functionally graded materials (FGMs) have various mechanical advantages and are naturally occurring, such as bamboo. Although bamboo is hollow and tapered, it remains resilient under a wind load. Based on this mechanical rationale, this study focuses on a large deflection of a tapering structure and the hollowing effect of a functionally graded beam. A theoretical analysis is conducted on a nonlinear bending of a slender and tapered hollow beam made of an axially FGM subjected to a uniformly distributed load undergoing a large deflection. To this end, governing equations are derived and a parametric study is conducted to investigate the effect of the inhomogeneous material, load magnitude and tapering and hollowing ratios on the large deflection of the beam. A linear analysis is conducted to examine the bending stress of the tapered beam and sets of deflection curves and angles along the beam are obtained and compared with values obtained from previous studies. As a result, the hollow and inhomogeneous nature of the axially FGM improves its rigidity against a wind load. This study provides insights into the potential use of axially FGMs to obtain more efficient and sturdier structural designs., 46215942
  • Morphogenesis strategies of hollow plants: avoidance of ovalization
    Carol Lee Chalermsin; Tohya Kanahama; Motohiro Sato
    Acta Mechanica, Springer Science and Business Media LLC, 03 Mar. 2025, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, 46215942;45664439
  • 力学のレンズから見えた「草」と「木」の境目
    佐藤太裕
    科学, 94, 3, 270, 272, Mar. 2024, [Invited], [Lead author, Last author, Corresponding author]
    Japanese, In book, 11970368
  • Self-buckling with initial imperfections: Application to trees
    Tohya Kanahama; Motohiro Sato
    International Journal of Engineering Science, 194, 103972, 103972, Elsevier BV, Jan. 2024, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, 11970368
  • Mechanical Instability of Heavy Column with Rotational Spring
    Tohya Kanahama; Carol Lee Chalermsin; Motohiro Sato
    Journal of Mechanics, Oxford University Press (OUP), 14 Dec. 2023, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, Abstract

    In previous research on the mechanical instability of trees based on mechanical theory, wild tree has been modeled as a cantilever which was perfectly attached to the ground. However, experimental research has identified two failure modes, including root turnover and self-buckling of the trunk. This suggests that the imperfect fixation caused by root-soil interaction must be considered when discussing tree stability. The purpose of this study is to clarify the self-buckling characteristics of wild trees considering soil instability. To account for the resistance moment caused by the interaction between the root and soil, trees as cantilevers fixed to the ground by a rotational spring were modeled. In this model, the self-buckling problem was formulated considering the rotational rigidity of the spring, and the formula derived for the critical height and buckling mode. As a result, the formula for critical height considering rotational rigidity was obtained, and it was found that the buckling modes can be classified into the rigid-body mode and beam mode based on the rotational rigidity. By comparing this result with the statistical law based on the measurement of real trees reported in previous research, it was determined that real trees were designed based on beam mode. This suggests that the wild tree skillfully balances the moment of resistance caused by the interaction between the root and soil to prevent “uprooting,” which is extremely fatal for trees. Moreover, it was also found that the safety factor of trees for self-buckling is ensured enough to prevent the beam mode., 11970368
  • Plant strategies for greatest height: tapering or hollowing
    Tohya Kanahama; Motohiro Sato
    Scientific Reports, 13, 1, Springer Science and Business Media LLC, 24 Oct. 2023, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, Abstract

    The tapered form and hollow cross-section of the stem and trunk of wild plants are rational mechanical approaches because they facilitate the plant simultaneously growing taller for photosynthesis and supporting its own weight. The purpose of this study is to clarify the advantages and disadvantages of tapering and hollowing from the perspective of the greatest probable height before self-buckling. We modelled woody plants using tapering or hollow cantilevers, formulated the greatest height before self-buckling, and derived a theoretical formula for the greatest probable height considering tapering and hollowing. This formula theoretically explains why almost all plants exhibit a tapered form: it allows for a greater height at an earlier growth stage than a hollow cross-section., 11970368
  • Impact of Land-Use Differences on Block-Size Distribution in Tokyo
    Yuri Akiba; Siyu Wang; Motohiro Sato; Hiroyuki Shima
    Journal of the Physical Society of Japan, 92, 10, Physical Society of Japan, 15 Oct. 2023, [Peer-reviewed]
    English, Scientific journal, 11970368
  • Mechanics-based classification rule for plants
    Tohya Kanahama; Motohiro Sato
    Proceedings of the National Academy of Sciences, 120, 41, Proceedings of the National Academy of Sciences, 06 Oct. 2023, [Peer-reviewed], [Last author]
    English, Scientific journal, The height of thick and solid plants, such as woody plants, is proportional to two-thirds of the power of their diameter at breast height. However, this rule cannot be applied to herbaceous plants that are thin and soft because the mechanisms supporting their bodies are fundamentally different. This study aims to clarify the rigidity control mechanism resulting from turgor pressure caused by internal water in herbaceous plants to formulate the corresponding scaling law. We modeled a herbaceous plant as a cantilever with the ground side as a fixed end, and the greatest height was formulated considering the axial tension force from the turgor pressure. The scaling law describing the relationship between the height and diameter in terms of the turgor pressure was theoretically derived. Moreover, we proposed a plant classification rule based on stress distribution., 11970368
  • Preparation of bamboo-derived structured cellulose and its evaluation as resin composite materials
    Hiroya Ishimaru; Misuzu Matsumoto; Takuya Yoshikawa; Motohiro Sato; Yuta Nakasaka; Takao Masuda
    Biomass and Bioenergy, 173, 106778, 106778, Elsevier BV, Jun. 2023, [Peer-reviewed]
    English, Scientific journal, 12050706
  • Bamboo: A Mechanically Optimum Design in Nature
    Hiroyuki Shima; Akio Inoue; Motohiro Sato
    Bamboo Science and Technology, 1, 29, Springer Nature Singapore, 15 Mar. 2023, [Peer-reviewed], [Invited], [Last author]
    English, In book, 11970368
  • -
    佐藤太裕
    Science Journal KAGAKU, 93, 3, 248, 253, Mar. 2023, [Invited], [Lead author, Corresponding author]
    Japanese, In book, 11970368
  • Rigidity control mechanism by turgor pressure in plants
    Tohya Kanahama; Satoru Tsugawa; Motohiro Sato
    Scientific Reports, 13, 1, Springer Science and Business Media LLC, 04 Feb. 2023, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, Abstract

    The bodies of herbaceous plants are slender, thin, and soft. These plants support their bodies through the action of turgor pressure associated with their internal water stores. The purpose of this study was to apply the principles of structural mechanics to clarify the underlying mechanism of rigidity control that is responsible for turgor pressure in plants and the reason behind the self-supporting ability of herbaceous plants. We modeled a plant a horizontally oriented thin-walled cylindrical cantilever with closed ends enclosing a cavity filled with water that is acted on by its own weight and by internal tension generated through turgor pressure. We derived an equation describing the plant’s consequent deflection, introducing a dimensionless parameter to express the decrease in deflection associated with the action of turgor pressure. We found that the mechanical and physical characteristics of herbaceous plants that would appear to be counter-productive from a superficial perspective increase the deflection decreasing effect of turgor pressure., 11970368
  • 竹取工学物語⑥ 竹の「しなり」と「形」を利用した先人たちの智恵と技術
    佐藤太裕
    科学, 93, 2, 167, 172, Feb. 2023, [Invited], [Lead author, Corresponding author]
    Japanese, In book, 11970368
  • -
    佐藤太裕
    Science Journal KAGAKU, 93, 1, 70, 75, Jan. 2023, [Invited], [Lead author, Corresponding author]
    Japanese, In book, 11970368
  • -
    佐藤太裕
    Science Journal KAGAKU, 92, 12, 1103, 1108, Dec. 2022, [Invited], [Lead author, Corresponding author]
    In book, 11970368
  • -
    佐藤太裕
    Science Journal KAGAKU, 92, 11, 956, 961, Nov. 2022, [Invited], [Lead author, Corresponding author]
    Japanese, In book
  • Empirical Rule of Fruit Rind Fragmentation in Muskmelon Netting
    Yuri Akiba; Akari Ishibashi; Motohiro Sato; Hiroyuki Shima
    Journal of the Physical Society of Japan, 91, 10, Physical Society of Japan, 15 Oct. 2022, [Peer-reviewed]
    English, Scientific journal, 11970368
  • -
    佐藤太裕
    Science Journal KAGAKU, 92, 10, 872, 877, Oct. 2022, [Invited], [Lead author, Corresponding author]
    Japanese, In book
  • -
    佐藤太裕
    Science Journal KAGAKU, 92, 9, 811, 815, Sep. 2022, [Invited], [Lead author, Corresponding author]
    Japanese, In book
  • Summation rules in critical self-buckling states of cylinders
    Tohya Kanahama; Motohiro Sato
    Mechanics Research Communications, 123, 103905, 103905, Elsevier BV, Jul. 2022, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, 11970368
  • Effective length of bamboo-like stiffened hollow cylindrical structures
    Ryo Nishiyama; Motohiro Sato
    Journal of Mechanics, 38, 250, 256, Oxford University Press (OUP), 02 Jun. 2022, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, ABSTRACT

    Hollow cylindrical structures are susceptible to local buckling because they flatten and significantly reduce their stiffness when they bend. Therefore, many previous studies aimed to improve the strength of pipelines and building structures were conducted. Our research group has focused on bamboo and has theoretically proven that stiffness anisotropy caused by bamboo's unique nodes and vascular bundles enhances the stiffness of cylindrical structures. In this study, to investigate this analytically, we carried out a finite-element analysis and succeeded in deriving a new dimensionless parameter that the stiffening effect of an anisotropic consideration. This result is applicable to a wide range of cylindrical structures, from thin-walled to thick-walled, and it is expected that bamboo-inspired bionic designs will be proposed in the future., 11970368
  • Structural rationalities of tapered hollow cylindrical beams and their use in Japanese traditional bamboo fishing rods
    Ryo Nishiyama; Motohiro Sato
    Scientific Reports, 12, 1, Springer Science and Business Media LLC, Feb. 2022, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, AbstractBamboo has historically been used in Japan as a structural material and for building tools such as fishing rods owing to its remarkable structural properties. In recent years, the materials used for manufacturing fishing rods have changed greatly owing to the development of composite materials; however, the basic slender tapered hollow cylindrical fishing rod design has remained unchanged throughout the long history of fishing. However, the mechanical rationale behind this structural design has not yet been sufficiently verified, and this study clarifies this. The analysis was performed by solving the nonlinear bending equation of a slender tapered cantilever beam with a concentrated load at the tip, which causes large deflection, using the Runge–Kutta method. The deflection curves and bending stresses were obtained, and the structural design to minimize the stresses was explored. Our results may prove useful for bamboo-inspired bionic design and bring to light our ancestors’ deep knowledge of natural materials and their advanced technological capabilities., 11970368
  • Mathematical modelling to determine the greatest height of trees
    Tohya Kanahama; Motohiro Sato
    Scientific Reports, 12, 1, Springer Science and Business Media LLC, Feb. 2022, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, AbstractThis study aimed to analyse the critical height of a column whose weight varies vertically in order to obtain a simple scaling law for a tree where the weight distribution considered. We modelled trees as cantilevers that were fixed to the ground and formulated a self-buckling problem for various weight distributions. A formula for calculating the critical height was derived in a simple form that did not include special functions. We obtained a theoretical clarification of the effect of the weight distribution of heavy columns on the buckling behaviour. A widely applicable scaling law for trees was obtained. We found that an actual tree manages to distribute the weight of its trunk and branches along its vertical extent in a manner that adequately secures its critical height. The method and findings of this study are applicable to a wide range of fields, such as the simplification of complicated buckling problems and the study of tree shape quantification., 11970368
  • A new taper index based on form-factor: application to three bamboo species (Phyllostachys spp.)
    Akio Inoue; Motohiro Sato; Hiroyuki Shima
    EUROPEAN JOURNAL OF FOREST RESEARCH, Sep. 2021, [Peer-reviewed]
    English, Scientific journal
  • CRITICAL HEIGHT FOR SELF-WEIGHT BUCKLING IN TAPERED TREES
    KANAHAMA Tohya; FUJIMURA Takanori; SATO Motohiro
    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 77, 1, 62, 71, Japan Society of Civil Engineers, 2021, [Peer-reviewed], [Last author, Corresponding author]
    Japanese, Scientific journal,

     Wild trees have solid cross sections and heavy branches. In order for trees to grow tall and large in their living environment, the ability to properly control their weight are required. The various mechanical rationalities to buckling under self-weight are hidden in trees form, it is therefore conceivable that clarification of them makes realization rational tower structure possible. The purpose of this study is to derive the theoretical solution of critical height for self-weight buckling in tapered trees and clarification the mechanical rationalities of tapered form. We model trees as cylinder with various tapers and derive theoretical solutions by effectively using boundary and mechanical conditions. By this study, theoretical solutions of critical height in tapered trees were derived and the simple calculation formulas were obtained by nonlinear regression analysis. Moreover, the theoretical and FEM based numerical solutions were compared with each other.

  • Scaling law for the onset of the surface wrinkling of multilayer tubes
    Motohiro Sato; Kazusa Ishigami; Hiroyuki Kato; Yoshitaka Umeno; Hiroyuki Shima
    Extreme Mechanics Letters, 40, 100970, 100970, Elsevier BV, Oct. 2020, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Corrugation of an unpaved road surface under vehicle weight
    C. Matsuyama; Y. Tanaka; M. Sato; H. Shima
    Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 476, 2241, 20200323, 20200323, The Royal Society, Sep. 2020, [Peer-reviewed]
    English, Scientific journal, Road corrugation refers to the formation of periodic, transverse ripples on unpaved road surfaces. It forms spontaneously on an initially flat surface under heavy traffic and can be considered to be a type of unstable growth phenomenon, possibly caused by the local volume contraction of the underlying soil due to a moving vehicle’s weight. In the present work, we demonstrate a possible mechanism for road corrugation using experimental data of soil consolidation and numerical simulations. The results indicate that the vertical oscillation of moving vehicles, which is excited by the initial irregularities of the surface, plays a key role in the development of corrugation.
  • Cross-Sectional Performance of Hollow Square Prisms with Rounded Edges
    Hiroyuki Shima; Nao Furukawa; Yuhei Kameyama; Akio Inoue; Motohiro Sato
    SYMMETRY-BASEL, 12, 6, Jun. 2020, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal
  • Estimation of culm volume reduction factors in five bamboo species (Phyllostachys spp.)
    Inoue, A; Shimada, M; Sato, M; Shima, H
    Journal of Forestry Research, 30, 6, 2069, 2078, Dec. 2019, [Peer-reviewed]
    English, Scientific journal
  • Allometric equations for predicting the aboveground biomass of square bamboo, Chimonobambusa quadrangularis
    Inoue Akio; Koshikawa Kazuki; Sato Motohiro; Shima Hiroyuki
    JOURNAL OF FOREST RESEARCH, 18 Nov. 2019, [Peer-reviewed]
    English, Scientific journal
  • Buckling-induced band-gap modulation in zigzag carbon nanotubes
    Umeno Yoshitaka; Sato Masanobu; Sato Motohiro; Shima Hiroyuki
    PHYSICAL REVIEW B, 100, 15, 08 Oct. 2019, [Peer-reviewed]
    English, Scientific journal
  • On the atomistic energetics of carbon nanotube collapse from AIREBO potential
    Umeno Yoshitaka; Yachi Yu; Sato Motohiro; Shima Hiroyuki
    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 106, 319, 325, Feb. 2019, [Peer-reviewed]
    English, Scientific journal
  • Maximum size-density relationship in bamboo forests: Case study of Phyllostachys pubescens forests in Japan
    Akio Inoue; Motohiro Sato; Hiroyuki Shima
    Forest Ecology and Management, 425, 138, 144, Elsevier B.V., 01 Oct. 2018, [Peer-reviewed]
    English, Scientific journal
  • Axial buckling behavior of single-walled carbon nanotubes: Atomistic structural instability analysis
    Masanobu Sato; Hiroyuki Shima; Motohiro Sato; Yoshitaka Umeno
    Physica E: Low-Dimensional Systems and Nanostructures, 103, 130, 142, Elsevier B.V., 01 Sep. 2018, [Peer-reviewed]
    English, Scientific journal
  • Allometric equations for predicting culm surface area of three bamboo species (Phyllostachys spp.)
    Akio Inoue; Yoshiyuki Miyazawa; Motohiro Sato; Hiroyuki Shima
    Forests, 9, 6, MDPI AG, 25 May 2018, [Peer-reviewed]
    English, Scientific journal
  • MOLECULAR DYNAMICS ANALYSIS OF PECULIAR CROSS-SECTIONAL BUCKLING BEHAVIORS IN MULTI-WALLED CARBON NANOTUBES
    YACHI Yu; UMENO Yoshitaka; SHIMA Hiroyuki; SATO Motohiro
    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 74, 1, 51, 62, 公益社団法人 土木学会, 2018, [Peer-reviewed], [Last author, Corresponding author]
    Japanese, Scientific journal,  The purpose of this study is reproduction of cross-sectional buckling behavior in carbon nanotubes (CNTs) under hydrostatic pressure by molecular dynamics (MD) simulations. One of the characteristics of CNTs is that the physical properties change due to the change in the cross-sectional shape under high pressure. Therefore, it is necessary to assess the cross-sectional deformation behavior under high pressure, in order to apply excellent material properties of CNTs to products. In earlier work, we carried out simulations based on the thin cylindrical shell theory to predict buckling behavior in cross sections such as critical pressure and buckling mode. In this study, we analyzed the cross-sectional deformation behavior of CNTs by MD simulations, which can follow more precise behavior, and compared it with cylindrical shell theory. This study reveals that the critical pressure of MD simulations agrees well with results of thin shell theory in single-walled carbon nanotubes. In addition, we confirmed that the thin shell theory is effective as a method to quantitatively evaluate critical pressure in the CNT when the diameter of the inner-most layer is somewhat large.
  • Dynamics of washboard road formation driven by a harmonic oscillator
    Teeranai Srimahachota; Hao Zheng; Motohiro Sato; Shunji Kanie; Hiroyuki Shima
    PHYSICAL REVIEW E, 96, 6, Dec. 2017, [Peer-reviewed]
    English, Scientific journal
  • Universal node distribution in three bamboo species (Phyllostachys spp.)
    Akio Inoue; Shiori Tochihara; Motohiro Sato; Hiroyuki Shima
    TREES-STRUCTURE AND FUNCTION, 31, 4, 1271, 1278, Aug. 2017, [Peer-reviewed]
    English, Scientific journal
  • POWER LAW OF CRITICAL BUCKLING IN STRUCTURAL MEMBERS SUPPORTED BY A WINKLER FOUNDATION
    M. Sato; S. Harasawa; Y. Konishi; T. Maruyama; S. J. Park
    JOURNAL OF MECHANICS, 33, 3, 369, 374, Jun. 2017, [Peer-reviewed]
    English, Scientific journal
  • Bamboo-inspired optimal design for functionally graded hollow cylinders
    Motohiro Sato; Akio Inoue; Hiroyuki Shima
    PLOS ONE, 12, 5, May 2017, [Peer-reviewed]
    English, Scientific journal
  • Atomistic model analysis of buckling behavior of compressed carbon nanotubes
    Yoshitaka Umeno; Masanobu Sato; Hiroyuki Shima; Motohiro Sato
    Solid State Phenomena, 258, 61, 64, Trans Tech Publications Ltd, 2017, [Peer-reviewed]
    English, International conference proceedings
  • Cross-sectional deformation in multi-walled carbon nanotubes under hydrostatic pressure
    Motohiro Sato; Yu Yachi; Ikuyo Koike; Hiroyuki Shima; Yoshitaka Umeno
    Solid State Phenomena, 258, 65, 68, Trans Tech Publications Ltd, 2017, [Peer-reviewed]
    English, International conference proceedings
  • Self-adaptive formation of uneven node spacings in wild bamboo
    Hiroyuki Shima; Motohiro Sato; Akio Inoue
    PHYSICAL REVIEW E, 93, 2, Feb. 2016, [Peer-reviewed]
    English, Scientific journal
  • Self-adaptive formation of uneven node spacings in wild bamboo
    Hiroyuki Shima; Motohiro Sato; Akio Inoue
    Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 93, Feb. 2016, [Peer-reviewed]
  • Atomistic model analysis of deformation of carbon nanotubes under axial compression
    M. Sato; Y. Umeno
    Key Engineering Materials, 725, 451, 455, 2016, [Peer-reviewed]
    English, International conference proceedings
  • OPTIMAL STRUCTURAL PROPERTIES OF CYLINDRICAL STRUCTURES LEARNING FROM MORPHOLOGY OF WILD BAMBOOS WITH PECULIAR NODES AND VASCULAR BUNDLES
    SATO Motohiro; TANIGAKI Toshiyuki; SATO Yuka; SHIMA Hiroyuki; INOUE Akio
    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 72, 2, I_25, I_34, 公益社団法人 土木学会, 2016, [Peer-reviewed]
    Japanese, Wild bamboo is a plant which has many peculiar stiff nodes and tissue structures. It has a hollow cylindrical shape, which gives it strength over its height, although there is a risk of losing resistance to bending. The purpose of this study is to examine how the nodes and vascular bundles contribute to bamboo's bending resistance by forming a nearly optimal shape, obtained over millions of years of evolution. From a standpoint of structural mechanics, bamboos can be modelled as cylindrical shells with ring stiffeners. In addition, cylindrical bamboos are regarded as a functionally graded structure due to its distribution of vascular bandles in the cross section of cylinders. From the measurement data analysis and theoretical formulations, we found that wild bamboos effectively control their node spacings as well as other geometric parameters corresponding to the bending moment diagram along the vertical direction. Moreover, we demonstrate theoretically that the vascular bandle distribution enhances the flexural rigidity of bamboos. These new findings give us the possibility of a new design concept of lightweight and high-strength functionally graded structures.
  • HELICAL BUCKLING OF SLENDER BEAM STRUCTURES SURROUNDED BY AN ELASTIC MEDIUM
    S. Harasawa; M. Sato
    JOURNAL OF MECHANICS, 31, 3, 241, 247, Jun. 2015, [Peer-reviewed]
    English, Scientific journal
  • INTERLAYER COUPLING EFFECT ON BUCKLING MODES OF SPHERICAL BILAYERS
    M. Sato; Y. Konishi; S. -J. Park
    JOURNAL OF MECHANICS, 31, 1, 29, 36, Feb. 2015, [Peer-reviewed]
    English, Scientific journal
  • Molecular Dynamics Study of Radial Corrugation in Carbon Nanotubes
    Hiroyuki Shima; Yoshitaka Umeno; Motohiro Sato
    MECHANICS OF ADVANCED MATERIALS AND STRUCTURES, 22, 6, 423, 427, 2015, [Peer-reviewed]
    English, Scientific journal
  • Brazier effect of single- and double-walled elastic tubes under pure bending
    Motohiro Sato; Yuta Ishiwata
    STRUCTURAL ENGINEERING AND MECHANICS, 53, 1, 17, 26, Jan. 2015, [Peer-reviewed]
    English, Scientific journal
  • Atomistic origin of radial corrugation in a few-walled carbon nanotubes: A molecular dynamics study
    Yoshitaka Umeno; Ikuyo Koike; Ayako Kusano; Hiroyuki Shima; Motohiro Sato
    PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 65, 135, 140, Jan. 2015, [Peer-reviewed]
    English, Scientific journal
  • 竹はなぜ節をもつのか?~剛と柔が共存する竹形態の妙~
    古屋健; 岡本佳子; 佐藤諭佳; 佐藤太裕; 島弘幸
    形の科学会誌, 29, 2, 156, 157, Nov. 2014
    Japanese
  • Suppression of Brazier Effect in Multilayered Cylinders
    Hiroyuki Shima; Motohiro Sato; Sung-Jin Park
    ADVANCES IN CONDENSED MATTER PHYSICS, 2014, 2014, [Peer-reviewed]
    English, Scientific journal
  • WAVY-SHAPED DEFORMATION ANALYSIS OF MULTI-WALLED CARBON NANOTUBES USING MOLECULAR DYNAMICS METHOD
    小池育代; 草野彩子; 佐藤太裕; 梅野宜崇; 島弘幸
    土木学会論文集 A2(応用力学)(Web), 70, 2, I.25-I.32 (J-STAGE), I_32, Japan Society of Civil Engineers, 2014, [Peer-reviewed]
    Japanese, This article focuses on the analysis of cross-sectional deformations for single- and multi-walled carbon nanotubes using a molecular dynamics method. Carbon nanotubes consist of a graphene sheet (two-dimensional hexagonal lattices of carbon atoms) rolled up into a cylinder. This nanoscale structure has generated enormous interest in the research field of science and engineering in the last decades because of its excellent mechanical properties, such as extremely high elastic modulus and tensile strength. For example, the Young's modulus of nanotubes is estimated to be on the order of TPa (i.e., several times stiffer than steel) and the tensile strength is as high as tens of GPa. On the other hand, carbon nanotubes are known to have its remarkable flexibility when subjected to external hydrostatic pressure and bending force. Owing to such mechanical properties, they are regarded as an ideal material for superstrong nanofiber and thus hold great promise for use as next-generation materials. It has also been broadly accepted that mechanical deformation of a carbon nanotube causes significant changes in its physical and chemical properties. Precise knowledge of its deformation mechanism and available geometry is, therefore, crucial for understanding the precise physics and in developing nanotube-based applications. In earlier work, we carried out simulations based on the thin cylindrical shell theory to predict the occurrence of wavy-shaped carbon nanotubes, called "radial corrugation". However, the shell theory is valid only within linear elastic region, thus being unavailing for discussing large deformation behaviours beyond elastic approximation. Against the backdrop, we have performed molecular dynamics simulations to explore the post-buckled behavior in the cross-section of carbon nanotubes under high pressure. We have confirmed various deformation modes with large amplitude, in which the stable mode is strongly dependent on the tube diameter and the number of concentric walls.
  • STIFFENER INSERTION BASED VARIANCE IN RADIAL STIFFNESS OF MULTI-CONCENTRIC HOLLOW TUBES
    Motohiro Sato; Hiroyuki Shima; S-J Park
    JOURNAL OF MECHANICS, 29, 4, 583, 588, Dec. 2013, [Peer-reviewed]
    English, Scientific journal
  • The Maximum Range of 'Tarzan's' Jump
    TAIRA Hisao; SATO Motohiro; SHIMA Hiroyuki
    物理教育, 61, 4, 194, 197, 日本物理教育学会, Dec. 2013, [Peer-reviewed]
    Japanese
  • KALEIDOSCOPIC MODE CHANGE IN CROSS-SECTIONAL DEFORMATION OF REINFORCED CARBON NANOTUBES
    Sung-Jin Park; Hiroyuki Shima; Motohiro Sato
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 27, 31, 1350179.1-1350179.9, Dec. 2013, [Peer-reviewed]
    English, Scientific journal
  • Radial deformation and band-gap modulation of pressurized carbon nanotubes
    H. Taira; H. Shima; Y. Umeno; M. Sato
    Coupled Systems Mechanics, 2, 2, 147, 157, 2013, [Peer-reviewed]
    English, Scientific journal
  • Effect of open-core screw dislocation on axial conductivity in semiconductor crystals
    H. Taira; M. Sato
    Effect of open-core screw dislocation on axial conductivity in semiconductor crystals, 1, 3, 171, 182, 2013, [Peer-reviewed]
    English, Scientific journal
  • Embedding effect on the mechanical stability of pressurised carbon nanotubes
    Motohiro Sato; Hisao Taira; Tetsuro Ikeda; Hiroyuki Shima
    Journal of Nanomaterials, 2013, 3, ARTICLE ID 767249,1-9, 2013, [Peer-reviewed]
    English, Scientific journal
  • Buckling patterns of complete spherical shells filled with an elastic medium under external pressure
    M. Sato; M. A. Wadee; K. Iiboshi; T. Sekizawa; H. Shima
    INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 59, 1, 22, 30, Jun. 2012, [Peer-reviewed]
    English, Scientific journal
  • Thin-shell theory based analysis of radially pressurized multiwall carbon nanotubes
    Hiroyuki Shima; Susanta Ghosh; Marino Arroyo; Kohtaroh Iiboshi; Motohiro Sato
    COMPUTATIONAL MATERIALS SCIENCE, 52, 1, 90, 94, Feb. 2012, [Peer-reviewed]
    English, Scientific journal
  • Hard-to-Soft Transition in Radial Buckling of Multi-Concentric Nanocylinders
    S. -J. Park; M. Sato; T. Ikeda; H. Shima
    World Journal of Mechanics, 2, 1, 42, 50, 2012, [Peer-reviewed]
    English, Scientific journal
  • Approximate formulation for Bifurcation Buckling Loads of Axially Compressed Cylindrical Shells with an Elastic Core
    M. Sato; K. Shimazaki
    Interactions and Multiscale Mechanics, 4, 4, 313, 320, 2011, [Peer-reviewed]
    English, Scientific journal
  • Elastic and Plastic Deformation of Carbon Nanotubes
    M. Sato
    PROCEEDINGS OF THE TWELFTH EAST ASIA-PACIFIC CONFERENCE ON STRUCTURAL ENGINEERING AND CONSTRUCTION (EASEC12), 14, 2366, 2372, 2011, [Peer-reviewed]
    English, International conference proceedings
  • Hydrostatically pressurized buckling of complete spherical shells filled with an elastic medium
    SATO MOTOHIRO; WADEE M. AHMER; SEKIZAWA TAKAFUMI; IIBOSHI KOHTAROH; SHIMA HIROYUKI
    土木学会論文集 A2(応用力学)(Web), 67, 2, I.15-I.22 (J-STAGE), 2011, [Peer-reviewed]
    English
  • Diverse corrugation pattern in radially shrinking carbon nanotubes
    Hiroyuki Shima; Motohiro Sato; Kohtaroh Iiboshi; Susanta Ghosh; Marino Arroyo
    Physical Review B - Condensed Matter and Materials Physics, 82, 8, 085401.1-085401.7, 02 Aug. 2010, [Peer-reviewed]
    English, Scientific journal
  • Diverse corrugation pattern in radially shrinking carbon nanotubes
    Hiroyuki Shima; Motohiro Sato; Kohtaroh Iiboshi; Susanta Ghosh; Marino Arroyo
    PHYSICAL REVIEW B, 82, 8, Aug. 2010, [Peer-reviewed]
    English, Scientific journal
  • 完全没水係留浮体のスナップ荷重発生メカニズムに関する解析的検討
    佐藤太裕; 星崎心吾; 蟹江俊仁; 三上隆
    海洋開発論文集, 26, 801, 805, Jun. 2010, [Peer-reviewed]
    Japanese
  • パイプインパイプの軸圧縮座屈に対するコアの力学的役割
    佐藤太裕; 嶋崎賢太
    海洋開発論文集, 26, 531, 535, Jun. 2010, [Peer-reviewed]
    Japanese
  • STRUCTURAL MODELING OF CARBON NANOTUBES BASED ON CONTINUUM ELASTIC THEORY
    Motohiro Sato; Mohammad Rahimi; Marino Arroyo; Hiroyuki Shima
    PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON MODELLING AND SIMULATION 2010 IN PRAGUE (MS'10 PRAGUE), 387, 390, 2010, [Peer-reviewed]
    English, International conference proceedings
  • 弾性体中多層カーボンナノチューブの半径方向圧力作用に対する特異な断面変形座屈モード発現の理論予測
    佐藤太裕; 島弘幸; 飯干晃太朗; 三上隆
    応用力学論文集(CD-ROM), 13, 19, 28, 2010, [Peer-reviewed]
    Japanese
  • CORE-TUBE MORPHOLOGY OF MULTIWALL CARBON NANOTUBES
    Motohiro Sato; Hiroyuki Shima; Kohtaroh Iiboshi
    INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 24, 1-2, 288, 294, Jan. 2010, [Peer-reviewed]
    English, Scientific journal
  • Pressure-induced structural transitions in multi-walled carbon nanotubes
    Hiroyuki Shima; Motohiro Sato
    PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 206, 10, 2228, 2233, Oct. 2009, [Peer-reviewed]
    English, Scientific journal
  • フレキシブルパイプインパイプの提案とその曲げ特性に関する基礎的検討
    佐藤太裕; 渡辺香奈; 白石圭祐; 蟹江俊仁; 赤川敏
    海洋開発論文集, 25, 737, 740, Jun. 2009, [Peer-reviewed]
    Japanese
  • Buckling Characteristics of Multiwalled Carbon Nanotubes under External Pressure
    M. Sato; H. Shima
    Interactions and Multiscale Mechanics, 2, 2, 209, 222, 2009, [Peer-reviewed]
    English, Scientific journal
  • Multiple radial corrugations in multiwalled carbon nanotubes under pressure
    Hiroyuki Shima; Motohiro Sato
    NANOTECHNOLOGY, 19, 49, 495705 (8 PP.), Dec. 2008, [Peer-reviewed]
    English, Scientific journal
  • Static displacement and elastic buckling characteristics of structural pipe-in-pipe cross-sections
    M. Sato; M. H. Patel; F. Trarieux
    STRUCTURAL ENGINEERING AND MECHANICS, 30, 3, 263, 278, Oct. 2008, [Peer-reviewed]
    English, Scientific journal
  • パイプインパイプ断面を有する海洋パイプラインの曲げ特性に対するコアの力学的役割について
    嶋崎賢太; 佐藤太裕; 蟹江俊仁; 三上隆
    海洋開発論文集, 24, 24, 1047, 1050, Japan Society of Civil Engineers, Jun. 2008, [Peer-reviewed]
    Japanese, Structural pipe-in-pipe cross-sections have significant potential for application in offshore oil and gas production systems because of their property that combines thermal insulation performance with structural strength and self weight in an integrated way. Such cross-sections comprise inner and outer thin walled pipes with the annulus between them fully filled by a selectable filler material to impart an appropriate combination of properties. For offshore pipelines, bending characteristics become one of the most important factors for the structural design of the pipelines. The purpose of this research is to investigate the bending characteristics of such pipe-in-pipe systems analytically by considering the Brazier effect. Results are presented to show the variation of the degree of ovalization and bending moment with the relative elastic modulus of the filler and pipe materials and the filler thickness.
  • 係留索配置形状が完全没水型係留浮体の三次元動揺特性に及ぼす影響
    佐藤太裕; 星崎心吾; 蟹江俊仁; 三上隆
    海洋開発論文集, 24, 24, 981, 985, Japan Society of Civil Engineers, Jun. 2008, [Peer-reviewed]
    Japanese, For a type of “perfectly underwater”structures moored by some tension legs, namely submerged floating structures, the dynamic behaviors of the floating body are expected to involve many severe design and computational problems. In addition, three dimensional motions with six degrees of freedom induced by some external forces like strong waves and earthquakes may be very complex and it is difficult to explain the mechanisms of the behavior accurately.
    This paper presents the three dimensional dynamic response characteristics of the submerged floating structures. Three dimensional restoring forces due to tension legs are introduced and dynamic properties such as natural period and fluctuating tension force are investigated here. Especially, we focus on the effect of tension leg arrangement on dynamic characteristics of submerged floating structure.
  • Mathematical analogy of a beam on elastic supports as a beam on elastic foundation
    Motohiro Sato; Shunji Kanie; Takashi Mikami
    APPLIED MATHEMATICAL MODELLING, 32, 5, 688, 699, May 2008, [Peer-reviewed]
    English, Scientific journal
  • Exact and simplified estimations for elastic buckling pressures of structural pipe-in-pipe cross sections under external hydrostatic pressure
    Motohiro Sato; Minoo H. Patel
    JOURNAL OF MARINE SCIENCE AND TECHNOLOGY, 12, 4, 251, 262, Nov. 2007, [Peer-reviewed]
    English, Scientific journal
  • Structural modeling of beams on elastic foundations with elasticity couplings
    Motohiro Sato; Shunji Kanie; Takashi Mikami
    MECHANICS RESEARCH COMMUNICATIONS, 34, 5-6, 451, 459, Jul. 2007, [Peer-reviewed]
    English, Scientific journal
  • パイプインパイプ断面を有する海洋パイプラインの静水圧作用時における簡易な座屈荷重評価式の検討
    佐藤太裕; 嶋崎賢太; 蟹江俊仁; 三上隆
    海洋開発論文集, 23, 23, 907, 911, Japan Society of Civil Engineers, Jun. 2007, [Peer-reviewed]
    Japanese, Structural pipe-in-pipe cross-sections have significant potential for application in offshore oil and gas production systems because of their property that combines thermal insulation performance with structural strength and self weight in an integrated way. Such cross-sections comprise inner and outer thin walled pipes with the annulus between them fully filled by a selectable filler material to impart an appropriate combination of properties. Structural pipe-in-pipe cross-sections can exhibit several different collapse mechanisms and the basis of the preferential occurrence of one over others is of interest. This paper presents a simplified evaluation method for predicting the elastic buckling behaviours of a structural pipe-in-pipe cross-section when subjected to external hydrostatic pressure. Results are presented to show the validity of the proposed simplified formulations for estimating the local and global buckling pressures.
  • 三次元流動解析に基づく底泥回収装置の検討
    蟹江俊仁; 鈴木雄太; 佐藤太裕; 旭幸司; 高橋伸次郎; 井上卓悦
    海洋開発論文集, 23, 23, 309, 314, Japan Society of Civil Engineers, Jun. 2007, [Peer-reviewed]
    Japanese, At the time being, deterioration in water quality of closed water body has become a serious issue for local fishery and accumulation of mud layer which covers lakebed has been thought as the cause of deterioration. Then, it can be said that maintenance and preservation of the water environment by retrieving those mud layer is one of the most important subjects to enhance and to promote regional economy in the vicinity with preserving precious marine resources.
    The authors have proposed a new retrieving method of lakebed mud on site. This method has been developed as an innovative way that requires neither additional chemicals for condensation of the mud nor a temporary yard for desiccation of the mud. After the first phase with indoor model experiment, it was confirmed that the method successfully retrieve the mud and an on-site experiment is now under planning. In this paper, the authors report a study result on the device, especially the shape of retrieving fan, with 3-D flow analysis. Through this study, important knowledge for designing the shape of fan was obtained in order to expect efficient retrieving. Though further experiment is necessary under various mud conditions to improve the efficiency, the method is getting close to a reality.
  • 極めて柔軟かつ厚いコアを有するパイプインパイプ断面の静水圧による局部座屈特性
    佐藤太裕; PATEL Minoo H; TRARIEUX Florent
    応用力学論文集, 9, 25, 32, Japan Society of Civil Engineers, Aug. 2006, [Peer-reviewed]
    Japanese, This paper presents an analysis of local collapse mechanisms of a structural pipe-in-pipe cross-section with very soft and thick core when subjected to external hydrostatic pressure. It formulates and solves the elastic collapse problem using the variational principle of minimum potential energy. Effects of therelative stiffness between the outer/inner pipes and the core, and the core thickness on the critical external pressures and the collapse modes are investigated. The paper also proposes a simplified formulation of the localbuckling problem where the outer pipe and its contact with the filler material is considered as a 'ringon an elastic foundation'.
  • Free vibration characteristics of cylindrical shells partially buried in elastic foundations
    HG Tj; T Mikami; S Kanie; M Sato
    JOURNAL OF SOUND AND VIBRATION, 290, 3-5, 785, 793, Mar. 2006, [Peer-reviewed]
    English, Scientific journal
  • Response of Cylindrical Shells Partially Buried in Elastic Foundations to Impact Loads
    TJ HARYADI GUNAWAN; MIKAMI TAKASHI; KANIE SHUNJI; SATO MOTOHIRO
    構造工学論文集 A, 52, 3, 1219, 1226, Mar. 2006, [Peer-reviewed]
    English
  • Free vibrations of fluid-filled cylindrical shells on elastic foundations
    HG Tj; T Mikami; S Kanie; M Sato
    THIN-WALLED STRUCTURES, 43, 11, 1746, 1762, Nov. 2005, [Peer-reviewed]
    English, Scientific journal
  • HEAVING BEHAVIOR AND ITS EVALUATION METHOD OF CHILLED GAS PIPELINE BURIED IN FROST SOIL
    KANIE Shunji; AKAGAWA Satoshi; MIKAMI Takashi; SATO Motohiro; KIM Ko Ui
    土木学会論文集, 798, 157, 166, 土木学会, Sep. 2005, [Peer-reviewed]
    Japanese
  • Finite element analysis of cylindrical shells partially buried in elastic foundations
    H Gunawan; T Mikami; S Kanie; M Sato
    COMPUTERS & STRUCTURES, 83, 21-22, 1730, 1741, Aug. 2005, [Peer-reviewed]
    English, Scientific journal
  • Free Vibrations of Cylindrical Shells Partially Suspended on Elastic Foundations
    TJ Haryadi Gunawan; MIKAMI Takashi; KANIE Shunji; SATO Motohiro
    構造工学論文集 A, 51A, 1, 1, 10, 20 Mar. 2005
    English
  • 底質改善工法開発のための底泥回収実験
    旭幸司; 高橋伸次郎; 井上卓悦; 蟹江俊仁; 佐藤太裕; 鈴木雄太
    海洋開発論文集, 21, 21, 879, 883, Japan Society of Civil Engineers, 2005, [Peer-reviewed]
    Japanese, At present, deterioration of water quality in closed water body has become a serious issue for the local fishery and an accumulated mud layer which covers lakebed has been thought as the cause of the deterioration. Then, it can be said that the maintenance and preservation of the water environment by retrieving the mud layer is one of the most important subjects to preserve and to promote the regional economy with maintaining precious marine resources.
    In this paper, the authors propose a new retrieving method of lakebed mud on site. This method has been developed as an innovative way that requires neither additional chemicals for condensation of the mud nor a temporary yard for desiccation of the mud. This research aims to obtain fundamental knowledge about the retrieving torque and its efficiency to establish this new method. The experimental result shows that the mud can be retrieved with the fan efficiently enough to adopt the method practically. However, further experiment is necessary under various mud conditions to improve the efficiency.
  • チルドガスパイプラインと凍土との相互作用評価について
    蟹江俊仁; 赤川敏; 佐藤太裕; 三上隆
    寒地技術論文・報告集, 20, 472, 478, Oct. 2004
    Japanese
  • 水中浮遊式トンネルの係数励振振動特性に関する基礎的検討
    佐藤太裕; 蟹江俊仁; 三上隆; 小室達明
    応用力学論文集, 7, 1, 31, 38, 土木学会, Aug. 2004, [Peer-reviewed]
    Japanese
  • 海中固定構造物に作用する波力と断面形状の関係に関する一考察
    三倉寛明; 蟹江俊仁; 三上隆; 佐藤太裕
    海洋開発論文集, 20, 20, 85, 88, Japan Society of Civil Engineers, 2004, [Peer-reviewed]
    Japanese, Recently, completely submerged structure resting on piles is expected as a new alternative structure to bridge and/or immersed tunnel for relatively shallow-water crossing. In case of those structures, no change in buoyancy can be expected and only pile must resist against external wave force. As a result, the piles should have enough length to exert their friction strength against pulling out force due to wave. Since high safety factor for pulling out is required, reducing vertical force acting on piles becomes important for economical design. This study aims to evaluate the effect of sectional shape on the wave force and to introduce the relationship between sectional shape and vertical wave force acting on supporting structure.
  • 完全没水係留浮体の結合共振特性について
    佐藤太裕; 蟹江俊仁; 三上隆; 小室達明
    海洋開発論文集, 20, 20, 1277, 1282, Japan Society of Civil Engineers, 2004, [Peer-reviewed]
    Japanese, This paper deals with the characteristics of combination resonance for submerged floating structure. The combination resonance takes place in a vibratory system having multiple degrees-of-freedom and under parametric excitation. In this study, it is assumed that the floating structure is moored by some tension legs and located in the water between seabed and water surface. Due to such a structural form, there is much possibility that complicated dynamic phenomena like parametric excitation take place. The parametric excitation is caused by the time-varying tension force of tension legs. The time-varying tension force arises when some dynamic loads such as regular waves act on the floating body and the body moves in the water. In this paper, analytical studies are carried out to confirm the possibility of the occurrence of unstable motions by introducing Mathieu equations and effects of tension leg arrangements on the combination resonance characteristics are investigated in particular.
  • 係留索の周期的変動張力による水中係留浮体の動的不安定性
    佐藤太裕; 小室達明; 蟹江俊仁; 三上隆
    海洋開発論文集, 20, 20, 1283, 1286, Japan Society of Civil Engineers, 2004, [Peer-reviewed]
    Japanese, Submerged Floating Structure is a whole new type of strait crossing which is fixed in the water and supported by the balance between buoyancy and drag force of tension legs. This structure is expected to be widely applicable for railway, road, pedestrian walk and transportation system of material and fluid. In order to realize this construction technology, however, there are a lot of problems to be solved.
    One of the most important probrems is parametric excitation which is the response caused by time-varying tension force of legs. In this paper, the parametric excitation phenomena of Submerged Floating Structure are studied analytically and characteristics of the dynamic instability are investigated
  • Fundamental study on the parametric excitation characteristics of Submerged Floating Tunnel
    Sato Motohiro; Kanie Shunji; Mikami Takashi; Komuro Tatsuaki
    Doboku Gakkai Ronbunshuu A, 7, 31, 38, Japan Society of Civil Engineers, 2004, [Peer-reviewed]
    This paper deals with the characteristics of the parametric excitation, which is one of the dynamic instability phenomena, of Submerged Floating Tunnel. In this study, it is assumed that the structure is moored by some tension legs and located in the water between seabed and water surface. The parametric excitation is caused by the time tension force of tension legs. The time-varying tension force arises when some dynamic loads such as regular waves act on the floating body and the body moves in the water. The analytical studies are carried out to confirm the possibility of the occurrnce of unstable motions by introducing Mathieu-type equations in this study and effects of tension leg arrangements, viscous damping, quadratic damping and external forces on the parametric excitation characteristics are investigated in particular.
  • 係留索配置形状が水中係留浮体の動的特性に与える影響の評価
    佐藤太裕; 蟹江俊仁; 三上隆
    海洋開発論文集, 19, 19, 649, 652, Japan Society of Civil Engineers, 2003, [Peer-reviewed]
    Japanese, For a type of “perfectly underwater” structures moored by tension legs like Submerged Floating tunnel, dynamic behaviors of the floating body are expected to involve many severe design and computational problems. In addition, motions induced by some external forces like strong waves and earthquakes may be very complex and it is difficult to explain the mechanisms of the behavior accurately. Especially, dynamic characteristics in consideration of elasticity coupling caused by restoring force of tension leg arrangement have not been clear so far. When elasticity coupling can arise, restoring forces of tension legs associated with the rotation show some bad influences on the dynamic behaviors. From this point of view, we focus on the effect of tension leg arrangement on dynamic characteristics of submerged floating structure in this study.
  • 係留索の動的挙動を考慮した完全没水浮体の振動特性
    蟹江俊仁; 佐藤太裕; 三上隆
    海洋開発論文集, 19, 19, 653, 658, Japan Society of Civil Engineers, 2003, [Peer-reviewed]
    Japanese, In case of completely submerged floating structure, no change in buoyancy can beexpected with its dynamic motion and the restoring force fully depends on cables. Consequently, it is necessary to seize the relation between structural displacement and restoring force and to evaluate the effect ofnonlinear deformation of cables on the dynamic response. This study aims to evaluate the effect of deformation of mooring cable caused by self-weight, inertia and fluid force on the vibration of the structure. This paper introduces nonlinear equations of motion considering the dynamic behavior of the cables and investigates the effect of dynamic deformation of cables on whole behavior with numerical examples.
  • Wave response characteristics of Submerged Floating Tunnel modeled as a beam on elastic foundation.
    佐藤太裕; 蟹江俊仁; 三上隆
    構造工学論文集 A, 48A, 1, 27, 34, Mar. 2002, [Peer-reviewed]
    Japanese
  • Modeling of Submerged Floating Tunnel as a beam on elastic foundation for dynamic analysis.
    佐藤太裕; 蟹江俊仁; 三上隆
    構造工学論文集 A, 47A, 1, 1, 8, Mar. 2001, [Peer-reviewed]
    Japanese
  • Modeling of Submerged Floating Tunnel as a beam on elastic foundation under bending vibration
    M Sato; S Kanie; T Mikami; T Yaginuma; H Hamaguchi
    STRAIT CROSSINGS 2001, 535, 540, 2001, [Peer-reviewed]
    English, International conference proceedings
  • ONE INVESTIGATION ON THE INITIAL STRUCTURAL DESIGN OF SUBMARGED FLOATING TUNNELS
    SATO Motohiro; YOKOHAMA Hideaki; KANIE Shunji; MIKAMI Takashi
    Doboku Gakkai Ronbunshuu B, 17, 17, 277, 280, Japan Society of Civil Engineers, 2001, [Peer-reviewed]
    This paper is concerned with modeling for simplified analyses of Submerged Floating Tunnel (S. F. T.). The simple model that we proposed is a beam on elastic foundation. It is known that this modeling of S. F. T. as a beam on elastic foundation is applicable only to a limited range of support stiffness, spacing and flexural rigidity of the tunnel from the aspect of structural mechanics. If this modeling gives satisfactory solution for global behaviors of the structure, it is very effective for designers to assume structural dimensions and evaluate the basic characteristics quickly. In this paper we investigate the applicability of this modeling in applying the structural conditions and dimensions of really assumed S. F. T. to the condition of equivalence between S. F. T. and beams on elastic foundation. Furthermore, we consider the effects of boundary condition when this beam model on elastic foundation can be applied.
  • A beam model on elastic foundation for analysis of Submerged Floating Tunnels.
    佐藤太裕; 蟹江俊仁; 三上隆
    構造工学論文集 A, 46A, 1, 41, 49, Mar. 2000, [Peer-reviewed]
    Japanese
■ Other Activities and Achievements
■ Books and other publications
■ Lectures, oral presentations, etc.
  • 植物と材料力学：科学を紐解く「言語」としての材料力学
    佐藤太裕
    日本機械学会北海道支部総会付帯特別講演会, 06 Mar. 2026, Japanese, Public discourse
    06 Mar. 2026 - 06 Mar. 2026, [Invited]
  • 植物の不思議な形態に学ぶ（マルチスケール）材料力学
    佐藤太裕
    第8回マルチスケール材料力学シンポジウム, 28 May 2023, Japanese, Invited oral presentation
    28 May 2023 - 28 May 2023, 11970368, [Invited]
  • 直立植物のかたちに潜む材料力学的合理性：樹木、竹（など）を例に
    佐藤太裕
    日本材料学会 北海道・東北支部合同材料フォーラム, 17 Mar. 2022, Japanese, Invited oral presentation
    17 Mar. 2022 - 17 Mar. 2022, 11970368, [Invited]
  • 賢い「竹」がもつ構造・材料力学的戦略
    佐藤太裕
    日本塑性加工学会 ポーラス材料分科会 2021年研究討論会「自然界のポーラス構造」, 02 Dec. 2021, Japanese, Invited oral presentation
    02 Dec. 2021 - 02 Dec. 2021, 11970368, [Invited]
  • 「植物」がエンジニアに教えてくれること －植物のかたちの力学的合理性から見えてくるもの－
    佐藤太裕
    北海道技術者育成プラットフォームシンポジウム, 17 Nov. 2021, Japanese, Public discourse
    17 Nov. 2021, [Invited]
  • 工学の視点で植物を見る －賢い「竹」が軽さと丈夫さを併せもつ秘密－
    佐藤太裕
    ナイスステップな研究者2019講演会, 08 Sep. 2020, Japanese, Public discourse
    08 Sep. 2020, [Invited]
  • 竹が「軽さ」と「丈夫さ」を併せもつ理由の構造・材料力学的解明
    佐藤太裕
    材料・材料強度・加工懇話会, 17 Feb. 2020, Japanese, Public discourse
    [Invited]
  • 賢い「竹」が生み出す巧みな材料力学的機能の秘密
    佐藤太裕
    第51回溶融塩化学討論会, 24 Oct. 2019, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • Learning from bamboo: New mechnical concept of "Plant"-mimetics
    Motohiro Sato
    The 9th East Asia Mechanical and Aerospace Engineering Workshop, 30 May 2019, English, Keynote oral presentation
    11970368;12050706, [Invited]
  • Learning from bamboo: Plant-mimetic design toward less-material & high-stiffness structure
    Motohiro Sato
    University of Cambridge, Engineering Department Structures Research Seminars, 16 Jun. 2017, English, Public discourse
    [Invited]
  • Learning from bamboo: Plant-mimetic design toward less material & high-stiffness structure
    Motohiro Sato
    Joint Seminar on the Application of Nano materials in Civil Engineering, Dec. 2016, English, Public discourse
    [Invited]
  • 構造力学的手法を用いた新しい次世代型構造システムの研究開発
    佐藤太裕
    北海道コーディネータ・ネットワーク・フォーラム、合同基調報告（平成25年度北海道科学技術奨励賞受賞記念研究報告会）, 20 Feb. 2014, Japanese, Public discourse
    [Invited], [Domestic Conference]
  • The past, present and future of the Seikan Tunnel
    Motohiro Sato
    6th International Symposium on Strait Crossings, Jun. 2013, English, Keynote oral presentation
    [Invited], [International presentation]
■ Syllabus
  • 構造力学特論, 2024年, 修士課程, 工学院
  • 計算固体力学特論, 2024年, 修士課程, 工学院
  • 構造力学特論, 2024年, 博士後期課程, 工学院
  • 計算固体力学特論, 2024年, 博士後期課程, 工学院
  • 材料力学Ⅰ, 2024年, 学士課程, 工学部
■ Affiliated academic society
  • Apr. 2021 - Present
    日本材料学会
  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS
  • JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
  • JAPAN SOCIETY OF CIVIL ENGINEERS
■ Research Themes
  • Elucidating the formation mechanism of "Soroban road" in winter for the development of a prediction system
    Grants-in-Aid for Scientific Research
    01 Apr. 2024 - 31 Mar. 2028
    島 弘幸; 佐藤 太裕; 梅野 宜崇
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), University of Yamanashi, 24K01111
  • 維管束植物に学ぶ軽量高剛性複合材料の構造設計指針の構築
    研究助成
    Apr. 2026 - Mar. 2028
    公益財団法人 池谷科学技術振興財団財団, Principal investigator
  • 道路網の幾何形状解析による新しい街づくりへの指針の提案
    研究助成
    Apr. 2025 - Mar. 2026
    佐藤 太裕, 秋葉 祐里
    公益財団法人大林財団, Principal investigator
  • プラントニックデザイン：植物の力学 的戦略に内在する構造設計指導原理の 発見と利用
    一般研究助成
    Apr. 2024 - Mar. 2025
    鹿島財団, Principal investigator
  • 竹林資源の高度利用技術開発：工学・農学・化学３方向からのアプローチ
    環境研究助成
    Nov. 2023 - Nov. 2024
    住友財団, 一般研究, Principal investigator
  • Bio-inspired quasi-periodic materials: their functionalization and physical property control
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2024
    SHIMA HIROYUKI
    In this project, we systematically described the mechanical rationality and potential application of quasi-periodic structures that are widely found in plants and other living organisms. We clarified the correlation between the mechanical function and morphological rationality relating to a quasi-periodic node distribution both experimentally and theoretically for plant species with hollow stem structures (e.g., bamboo, rice, and butterbur). In addition, we quantitatively evaluated the technical application of the functional form, through the consideration regarding a highly rigid tower structure imitating bamboo and policy for improving the lodging resistance of rice. We further analyzed in detail the mesh pattern on the skin of cantaloupes and the crack patterns found on tree bark and thus formulated universal geometric properties hidden in crack networks from the perspective of fracture mechanics.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), University of Yamanashi, 19K03766
  • 空間周期性の構造安定論的解釈と合理化社会・構造システム設計思想のパラダイムシフト
    科学研究費助成事業（基盤研究(A)）
    Apr. 2018 - Mar. 2023
    佐藤太裕
    文部科学省, Principal investigator, Competitive research funding
  • 竹の優れた機能に関する経験知・言い伝えの理論的解釈と新しい竹林資源利用技術の開発
    科学研究費助成事業（基盤研究(B)（特設分野研究））
    Jul. 2018 - Mar. 2021
    佐藤太裕
    文部科学省, Principal investigator, Competitive research funding
  • Spontaneous Corrugation on Road Surface due to Moving Vehicles: Scientific Study on the Formation Mechanism for Safety
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    Kanie Shunji; Kaneda Yasuhiro; Ngata Yasuhiro; Masaki Satoshi; Wadee M. Ahmer; Ostlid Havard
    This research consists of theoretical study, reproduction experiment and on-site observation. In the experiment, various road materials such as dry sand, silt, glass beads and artificial snow are adopted to reproduce the spontaneous corrugation with varying their density, water content and temperature to observe the formation mechanism.
    Because of this research, the physical process of formation is almost explained by a numerical simulation based on the experimental results. In addition, it becomes possible to forecast the occurrence by comparing the on-site observation with the meteorological data obtained at the closest station.
    We believe that the findings through this research contribute to provide important information for road administration during winter.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 16K01278
  • Research and development of new structural system with multiple functions by(Fostering Joint International Research)
    Grants-in-Aid for Scientific Research
    Apr. 2016 - Mar. 2019
    Sato Motohiro
    This study is the joint international research to propose new structural systems with multiple functions by introducing nanotechnology and bioscience. To achieve the purpose of this study, I stayed in Incheon National University (Korea, in 2016, for three monthes) and University of Cambridge (UK, in 2016, for three monthes).
    Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research), Hokkaido University, Principal investigator, Competitive research funding, 15KK0220
  • 自然界における周期性の自発的パターン形成機構解明と社会システム設計への合理的応用
    科学研究費助成事業（挑戦的萌芽研究）
    Apr. 2016 - Mar. 2018
    佐藤太裕
    文部科学省, Principal investigator, Competitive research funding
  • Research and development of new structural system with multiple functions by introducing nanotechnology and bioscience
    Grants-in-Aid for Scientific Research
    Apr. 2015 - Mar. 2018
    Sato Motohiro
    This study proposes new structural systems with multiple functions by introducing nanotechnology and bioscience. To achieve the purpose of this study, we have investigated (1) the novel structural behaviours of "carbon nanotubes" and (2) the new structural biomimetical design concept based on the example of "bamboo".
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 15H04207
  • 竹の節と組織構造に学ぶ合理的な構造システムの設計技術開発
    研究助成金
    Apr. 2016 - Mar. 2017
    佐藤太裕
    寿原記念財団, Principal investigator, Competitive research funding
  • Development of pipe-in-pipe filled with frozen material for practical use
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    Kanie Shunji; SATO Motohiro
    Pipe-in-pipe filled with frozen material can bend smoothly to a large curvature without failure. The authors improved a bending apparatus for experiment to make it follow the bending behavior from elastic to plastic ranges consistently. The measuring method was also improved to observe the large bending curvature by a digital image processing with a high resolution camera. As a result, it was confirmed that the performance of pipe-in-pipe filled with frozen material was drastically improved. The authors proposed numerical models which can evaluate the bending behavior of the pipe-in-pipes, and it becomes possible to explain the effect of filling material on the increase in ductility. The authors are convinced of that the application of pipe-in-pipe to a practical use was enhanced.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 25420473
  • Investigation of occurance mechanism of washboard road phenomena
    Grants-in-Aid for Scientific Research
    Apr. 2014 - Mar. 2016
    Sato Motohiro; KANIE Shunji; SHIMA Hiroyuki
    The purpose of this study is to investigate the occurance mechanism of "washboard road" phenomena which are frequently found on unpaved or snow-covered roads. We consider a couple of original experimental, theoretical and measurement methods to investigate the origin of these phenomena and obtain some new findings which is written in the report below.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, Principal investigator, Competitive research funding, 26560160
  • Development on state-of-the-art high performance structural technologies by combination of hard and soft materials
    Grants-in-Aid for Scientific Research
    Apr. 2012 - Mar. 2015
    SATO Motohiro
    This study proposes the state-of-the-art high performance structural systems by combination of hard and soft materials in order to prevent stress concentlation and to realize high durability and resilience. To do this, we have investigated the structural properties of some new structural technologies, such as pipe-in-pipe systems with granular core materials, laminate structures, carbon nanotubes, and so on. Theoretical and analytical researches have been carried out thoroughout the latest numerical techniques and we have shown some noble structural performances.
    Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (A), Hokkaido University, Principal investigator, Competitive research funding, 24686096
  • 極微スケール炭素繊維を用いた高機能構造材料開発を可能にする革新的マルチスケール構造解析技術の開発
    研究助成金
    Apr. 2013 - Mar. 2014
    佐藤太裕
    寿原記念財団, Principal investigator, Competitive research funding
  • Power generation and disaster prevention system by using structural behaviours of Submerged floating structures
    Grants-in-Aid for Scientific Research
    2012 - 2013
    SATO Motohiro
    In the dynamic characteristics of Submerged floating tunnels, we should consider the effects of "Nonlinear fluid forces", "Complicated wave forces acts on the floating bodies in the both horizontal and vertical directions" and "Fluctuation of the floating bodies which are moored by some tension legs".
    By considering these effects above, nonlinear responses of submerged floating structures have been investigated and the structurel feasibility of this strucrture has been discussed. In addition to this, structurel modelling of floating bodies are considered from the structural mechanics point of view.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, Principal investigator, Competitive research funding, 24651183
  • Research and development of Flexibility-controllable structural pipe-in-pipe systems
    Grants-in-Aid for Scientific Research(若手研究(B))
    Apr. 2009 - Mar. 2012
    Motohiro SATO
    This research aims to develop a brand-new flexibility-controllable structural pipe-in-pipe system. This "sandwich" system consists of outer and inner layer(usually steal) and cores between each layer. The interesting characteristics of this system is that the core is sand or equivalent granular material, which enable us to easily control the bending property of pipes. Both theoretical and experimental investigation have been carried out and the advantage of this system has been shown.
    Ministry of Education, Culture, Sports, Science and Technology, 若手研究(B), 北海道大学, Principal investigator, Competitive research funding, 21760662
  • Development of Chilled Gas Pipeline Complying with Environmental Change, Innovation due to Composite Materials
    Grants-in-Aid for Scientific Research(基盤研究(B))
    Apr. 2008 - Mar. 2011
    Shunji KANIE; 赤川 敏; Takashi MIKAMI; Go IWAHANA; Motohiro SATO; Satoshi AKAGAWA
    A pipe-in-pipe filled with sand was developed as an innovative structure for chilled gas pipeline in northern cold regions where a plenty of natural gas is reserved. As a result of the study, it is confirmed that the pipe-in-pipe can comply with environmental change due to increased ductility by sand because it allows large deformation. In addition, self recovery in flexural rigidity and anti-leaking becomes possible by artificial freezing and thawing of surrounding soil.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 20360196
  • チューブ状構造の複雑な変形挙動に関する構造力学的研究～ナノからマクロスケールまでを包含する新しい力学的数理モデルの構築～
    若手教員在外研究助成
    2010 - 2011
    佐藤太裕
    北海道大学大学院工学研究科, Principal investigator, Competitive research funding
  • 二重管構造の採用による埋設配管の応力集中回避性能に関する解析的検討
    大学助成制度
    2010 - 2011
    佐藤太裕
    北海道ガス, Principal investigator, Competitive research funding
  • ナノ構造体の優れた力学特性を利用した新しい高強度構造材料の創製
    重点配分経費（若手研究者自立支援）
    2009 - 2010
    佐藤太裕
    北海道大学, Principal investigator, Competitive research funding
  • 災害安全性の高い埋設配管構造技術とその構造力学的特性に関する研究
    大学助成制度
    2009 - 2010
    佐藤太裕
    北海道ガス, Principal investigator, Competitive research funding
  • New structural model for the analysis of complicated structural behaviors of offshore pipelines
    Grants-in-Aid for Scientific Research(若手研究(B))
    Apr. 2006 - Mar. 2009
    Motohiro SATO
    海洋パイプラインは、大水深域での極めて大きな静水圧作用など、厳しい海洋環境下でも安定したエネルギー輸送が要求される構造物である。本研究はこの要求性能を高い次元で満足し、かつ構造設計の自由度が大きい海洋パイプラインとして現在世界的に注目されている「パイプインパイプシステム」について、その構造設計に関わる構造解析モデルの構築と、構造挙動の把握を行ったものである。
    Ministry of Education, Culture, Sports, Science and Technology, 若手研究(B), 北海道大学, Principal investigator, Competitive research funding, 18760615
  • パイプインパイプ構造における曲げ挙動評価システムの構築
    大学助成制度
    2008 - 2009
    佐藤太裕
    北海道ガス, Principal investigator, Competitive research funding
  • DESIGN METHOD FOR SUPPORT STRUCTURE OF ROAD TONNEL IN COLD REGION CONSIDERING THE DECRESE IN COST OF CONSTRUCTION
    Grants-in-Aid for Scientific Research(基盤研究(B))
    Apr. 2004 - Mar. 2007
    Takashi MIKAMI; 須藤 敦史; 佐藤 京; Shunji KANIE; Motohiro SATO
    Tunnel lining is designed and constructed mainly based on the past experience. Considering mechanical characteristic to lining and the development of anti-frost method tunnels in cold region lead to a proper structure, and it can reduce the cost of construction. The principal results of this study are summarized as follows :1.Proposal of newly confinement curve : In this study, the newly confinement curve for support (namely stiffness of support) is developed. To this end, the tunnel is idealized as a perfectly cylindrical thin shell with two stiffening steel rings at ends. The mainly results are as follows:(1)The results for the stiffness of support obtained by this study are less than the ones obtained by the thin ring theory; the maximum error is 20 percent.(2)The effect of stiffening steel ring may be presented in terms of an effective width (0.35〜1)L where L is the length between two rings.2.Estimation of temperature overall the length at tunnels in cold region : For heat insulator design at road tunnel in cold region, it is necessary to estimate and/or determine the lowest (periodical) temperatures overall the length at tunnel. An equation for estimating temperature by a theoretical analysis considering heat convection/conduction between the tunnel-ground and the air flow is presented. From this study, the following results are obtained;(1)The calculated values well agree with the observed ones.(2)We can reasonably determine the necessary length of anti-frost treatment from tunnel entrance.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 北海道大学, Coinvestigator not use grants, Competitive research funding, 16360221
  • 係留浮体式風力発電システムの技術成立性に関する調査研究
    研究助成（電気・エネルギー一般研究）
    2006 - 2007
    佐藤太裕
    （財）東電記念科学技術研究所, Principal investigator, Competitive research funding
  • 水中浮遊式トンネルの実現に向けた動的不安定問題の解明
    研究者海外派遣援助（長期）
    2005 - 2006
    佐藤太裕
    鹿島学術振興財団, Principal investigator, Competitive research funding
  • 水中浮遊式トンネルにおける動的不安定挙動発生機構の解明
    基礎的研究開発育成事業（若手研究補助金）
    2004 - 2005
    佐藤太裕
    ノーステック財団, Principal investigator, Competitive research funding
  • 微生物を利用した再生骨材の製造とその品質に関する研究
    科学研究費補助金(萌芽研究)
    2003 - 2004
    角田 與史雄; 佐藤 太裕; 佐藤 太裕; 松村 宇; 伊藤 正澄; 佐藤 靖彦
    本研究は,バクテリアリーチングにおいて利用されてきた方法を基本とし,微生物を利用して再生骨材を製造し,その品質を明らかにすることで,再生骨材の製造に微生物を利用することの有用性を示そうとするものである.本研究において,多種多様な微生物の中から硫黄酸化細菌と鉄酸化細菌に着目した基礎実験を行った.すなわち,細菌の有無,骨材の有無,コンクリート塊の大きさ,炭酸化の有無がペースト及びモルタルの劣化度に及ぼす影響を実験的に明らかにした.得られた知見を以下に列挙する.・硫黄酸化細菌及び鉄酸化細菌が増加すると培地のPHを低下させ,モルタルをよく剥離させ,カルシウムイオンを溶脱させる.・硫黄酸化細菌と鉄酸化細菌の活動は,コンクリート塊のサイズが5-20mmの範囲の方が,5mm以下の範囲よりも活発化した.これは塊のサイズが小さいと培地に溶け出すアルカリ量が多くなるためである.それゆえ,微生物を摂取する前に炭酸化させた方が良い.・硫黄酸化細菌と鉄酸化細菌が骨材に及ぼす影響は工学的に無視できる.・酸性硫黄温泉水を培地として利用した場合,効率よくカルシウムイオンを遊離させることができる.しかし,コンクリート塊の表面に生成される腐食性生物が硫酸イオンの浸透を阻止する為,反応速度が著しく低下する.
    文部科学省, 萌芽研究, 北海道大学, Principal investigator, Competitive research funding, 15656103
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