Kohiyama, Masayuki

写真a

Affiliation

Faculty of Science and Technology, Department of System Design Engineering (Yagami)

Position

Professor

Related Websites

External Links

Message from the Faculty Member 【 Display / hide

  • We believe that engineers need to improve their communication skills, problem finding/solving skills, and leadership. By increasing the trust of engineers, excellent products can become more widespread and society can be enriched. the more excellent products will spread and the society will be enriched. In our research activities, we aim to cultivate these skills through uncompromising discussions.

Profile Summary 【 Display / hide

  • This laboratory focuses on performance-based design and optimal design of structures that realize architectural and civil engineering structures with the performance demanded by the users and owners. In order to design the society that has the secure and resilient mechanisms against disasters, the disaster reduction systems and disaster-resistant housing and communities are extensively studied, in which risk evaluation and damage estimation of structures take a leading part.

Career 【 Display / hide

  • 1995.04
    -
    1996.03

    Engineer, Architectural and Engineering Design Group, Kajima Corporation

  • 1996.04
    -
    1999.03

    Research Engineer, Kajima Technical Research Institute, Kajima Corporation

  • 1999.04
    -
    2001.03

    Research Scientist, Earthquake Disaster Mitigation Research Center, Riken

  • 2001.04
    -
    2005.03

    Research Associate, Institute of Industrial Science, The University of Tokyo

  • 2004.04
    -
    2005.03

    Postdoctoral Fellow of Japan Society of Promotion of Science, and Visiting Associate Professor of Stanford University

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Academic Background 【 Display / hide

  • 1993.03

    Kyoto University, Faculty of Engineering, School of Architecture

    University, Graduated

  • 1995.03

    Kyoto University, Graduate School of Engineering, Department of Architecture and Architectural Engineering

    Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide

  • Doctor of Informatics, Kyoto University, Dissertation, 2002.03

Licenses and Qualifications 【 Display / hide

  • first-class registered architect, 1998.02

 

Research Areas 【 Display / hide

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering (Structural Engineering, Earthquake Engineering, Maintenance Management Engineering)

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Building structures and materials (Building Construction/Material)

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Social systems engineering (Social System Engineering/Safety System)

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Safety engineering (Social System Engineering/Safety System)

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering (Natural Disaster Science)

Research Keywords 【 Display / hide

  • Earthquake Engineering

  • Architectural Structural Engineering

Research Themes 【 Display / hide

  • 設備被害を軽減するブロードキャスト対応制震システム, 

    2016
    -
    2019

     View Summary

    建物内の設備機器と連携して地震時の機能維持を図る,高度な地震対応力を有するアクティブ/セミアクティブ制震システムの実現を目指す。

  • Cooperative Control of a Building Structure and Multiple Instruments to Enhance Sustainability of their Functions, 

    2012
    -
    2015

     View Summary

    本研究は,建物の制振装置と建物内の機器の制振装置を協調的に動作させる効果的な手法の提案を目的とする。建物内に制振装置を持つ複数の機器が導入されたとき,機能維持のための合理的な制御方法を確立するとともに,制御装置間の通信方法を制御性能・信頼性・保守性・保全性などの観点を踏まえ構築することを目指す。

  • Autonomous Cooperative Control of a Building-Elevator System Under Long Period Ground Motion, 

    2010
    -
    2012

     View Summary

    In order to reduce elevator rope damage in a high-rise building due to an earthquake, cooperative control of vibration controllers for a building and elevator rope is studied.

 

Books 【 Display / hide

  • 都市・建築レジリエンスデザイン入門

    小檜山 雅之,ホルヘ・アルマザン,紙田 和代, 慶應義塾大学出版会, 2020.10

  • Guidebook of Recommendations for Loads on Buildings

    Architectural Institute of Japan, Architectural Institute of Japan, 2016.02

    Scope: pp. 1-6

     View Summary

    日本建築学会の2015年版「建築物荷重指針・同解説」を活用し性能設計を行うため、設計の流れや設計例、詳細な解説を記載。1章「性能設計の実現に向けて」の1.1節「目標性能水準設定の基本的な考え方と設計者の役割」の執筆を担当。

  • High-Performance Computing for Structural Mechanics and Earthquake/Tsunami Engineering

    Makoto Ohsaki, Tomoshi Miyamura, Masayuki Kohiyama, Takuzo Yamashita, and Hiroshi Akiba, Springer International Publishing, 2015.11

    Scope: Seismic Response Simulation of Building Structures (pp. 105-139)

     View Summary

    In this chapter, we present an overview of the E-Simulator for application to seismic response analysis of building structures. Accuracy and computational performance of simulation using the E-Simulator are discussed through examples of seismic response analysis of a four-story steel frame, buckling analysis of a column, and simulations of static cyclic responses of a composite beam and an exterior wall. Results of seismic response analysis with fixed base as well as soil-structure interaction analysis are presented for a high-rise building frame. Computational performance using the K computer is also discussed.

  • Recommendations for Loads on Buildings (2015)

    Architectural Institute of Japan, Architectural Institute of Japan, 2015.02

    Scope: pp. 95-112

     View Summary

    日本建築学会による,建築物の構造設計の際に用いる荷重について,基本理念や考え方を示した指針。1章総則の1.2節基本概念と1.3節用語,2章荷重の種類と組合せの2.1節荷重の種類,2.2節荷重の基本値,2.3節荷重の組合せと要求性能の執筆を担当。

  • Excelで学ぶ地震リスク評価

    小檜山 雅之, 技報堂出版, 2011.08

    Scope: 4章 フラジリティと損傷度の評価, pp. 39-61

     View Summary

    日本建築学会荷重運営委員会信頼性工学利用小委員会が,建築工学における確率・統計の利用の普及活動の一環として出版。地震リスク評価について,いくつかの例題をExcel を使って解くことで,ひととおり学べる内容となっている。4章フラジリティと損傷度の評価の執筆を担当。

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Papers 【 Display / hide

  • A Warm Standby Based on the Probability to Exceed Damage Threshold for Seismic Response of a Server

    Yusuke KIDA, Enon HIRAOKA, Masayuki KOHIYAMA

    Journal of Social Safety Science (Institute of Social Safety Science)   ( 43 ) 19 - 27 2023.11

    Research paper (scientific journal), Joint Work, Last author, Accepted,  ISSN  1345-2088

     View Summary

    This study proposes a new warm standby method for computer servers based on seismic response. The proposed method triggers a warm standby in the case that the exceedance probability of the safety limit of seismic response predicted by the last two-second observation record exceeds a preset threshold. Numerical simulations showed that the proposed method reduced the loss cost by 1.64% compared to conventional methods. To validate this method, we conducted shaking table tests. When a simulated earthquake motion was input, the loss cost was reduced by 60.6%. However, when observed records were input, the loss cost was increased by 3.89%. The results suggest that it is necessary improve the input ground motion model.

  • Development of Tool to Enable Autonomous In-Person and Remote Tabletop Exercises by Residents for Developing Next-Generation Leaders for Volcanic Disaster Reduction

    Masayuki KOHIYAMA, Honoka TAKASHIMA, Masayasu YAMAUCHI, Mitsuhiro YOSHIMOTO, Tomohiro KUBO

    Journal of Social Safety Science (Institute of Social Safety Science)   ( 43 ) 315 - 325 2023.11

    Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted,  ISSN  1345-2088

     View Summary

    To reduce volcanic disasters, it is important for residents to practice mutual support under the leadership of voluntary disaster reduction groups. However, many communities lack the human resource for their future leaders. To address this issue, we proposed a digital tool for residents to develop leaders by themselves. The system requirements were determined to enable residents to conduct autonomous and effective tabletop exercise in both in-person and remote formats. The usefulness of the tool was confirmed through workshops with residents of the areas at the foot of Mt. Fuji.

  • Study on a Simplified Model of a High-Rise Shear-Type Building for Evaluation of Q-Δ Resonance

    Anamizu R., Kohiyama M.

    Japan Architectural Review (Wiley)  6 ( 1 )  2023.10

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted,  ISSN  2475-8876

     View Summary

    To evaluate Q–Δ resonance, which is a torsional resonance phenomenon caused by geometric nonlinearity, a simplified model for a multistory non-eccentric building with a shear-type structure was proposed. A four-story small-scale specimen was designed and fabricated, assuming a non-eccentric steel structure with a height of 324 m, and conducted shaking table tests of the specimen. Q–Δ resonance was confirmed as predicted by the simplified model. In addition, the simplified model reproduced the resonance amplitude calculated using a finite element model of the specimen with constrained out-of-plane slab rotation. The simplified model can be used to predict the Q–Δ resonance response when the bending deformation of an entire building is very small.

  • Probability Distribution of Torsional Response by Q–Δ Resonance of Multi-Story Building under Long-Period Seismic Motion

    Kohiyama M.

    Proceedings of the 14th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP14)  2023.07

    Research paper (international conference proceedings), Single Work, Lead author, Corresponding author, Accepted

     View Summary

    When the torsional moment owing to geometric nonlinearity synchronizes with the torsional mode response, an internal resonance phenomenon occurs in a building structure system. The author’s research group calls this phenomenon Q–Δ resonance. The probability distribution of the torsional response was evaluated using Monte Carlo simulations on a 60-story building model, the input wave being simulated using nonstationary colored-noise ground motion. The results showed that the torsional response greatly increased the horizontal acceleration response and the response amplification ratio between the center and corner of the top floor could exceed 1.2 when the model satisfied the Q–Δ resonance condition that the natural frequency of the torsional second mode matched the sum of the first natural frequencies in the x- and y-directions. It was also evident that closer proximity to the resonance condition increased the amplification ratio. These results suggest that Q–Δ resonance may need to be considered in seismic design.

  • BAYESIAN UPDATING OF WOODEN STRUCTURAL PARAMETERS AND SEISMIC DAMAGE CLASSIFIER USING NEURAL NETWORK

    Mizobuchi R., Kohiyama M., Yamashita T.

    Proceedings of the 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023) 1   2335 - 2347 2023.06

    Research paper (international conference proceedings), Joint Work, Accepted,  ISSN  26233347

     View Summary

    Structural health monitoring is an effective way to quickly and efficiently detect earthquake damage to a building. However, its applications to wooden buildings are still limited. One of the challenges in predicting the seismic response of a wooden structure is that the effect of variance in its material and structural properties is relatively significant. To handle this problem, we propose a method to update the damage classifier using Bayesian system identification. The damage classifier is constructed using neural network (NN) and machine learning techniques. The method utilizes the weighted loss function for the NN to reflect the updated probability distribution of the structural parameters. The NN is tuned using backpropagation, where the training data are consequently weighed by the weighed loss function, directly using the value of the posterior probability, according to the data obtained from the numerical model of a target structure with the corresponding parameters. Using the result of the Bayesian updating, the tuned NN damage classifier achieved a higher accuracy than before tuning by reflecting the posterior probability distribution of the structural parameters.

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Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • 座談会:震災復興から考えるレジリエントな社会

    菅原 昭彦,福迫 昌之,紙田 和代,小檜山 雅之,厳 網林

    三田評論 (慶應義塾大学出版会)   ( 1253 ) 10 - 26 2021.03

    Article, review, commentary, editorial, etc. (bulletin of university, research institution), Joint Work,  ISSN  1343-618X

  • Editorial: Innovative methodologies for resilient buildings and cities

    Takewaki I., Kohiyama M., Trombetti T., Tesfamariam S., Lu X.

    Frontiers in Built Environment (Frontiers in Built Environment)  5 2019.07

  • 細分化された学問と分断された世界をつなぐ

    Masayuki KOHIYAMA

    ACe 建設業界 (一般社団法人日本建設業連合会)  80   26 - 26 2017.12

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work,  ISSN  21861862

  • 東日本大震災・熊本地震災害の教訓を生かした建築・まちづくり~建物の「社会性」向上に向けて~

    Masayuki KOHIYAMA

    月刊不動産流通 (不動産流通研究所)   ( 419 ) 8 - 9 2017.04

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work,  ISSN  0286-388X

  • 阪神・淡路大震災20 年シンポジウム「地震被害の軽減に向けた研究者たちのメッセージ―阪神・淡路大震災20 年:地震関連科学の到達点と新たな決意―」開催報告

    Masayuki KOHIYAMA

    JAEE Newsletter (Japan Association for Earthquake Engineering)  4 ( 1 ) 9 - 12 2015.04

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

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Presentations 【 Display / hide

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • Resilient Vibration Control Method Considering Functional Continuity and Rapid Restoration

    2020.04
    -
    2024.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

  • Broadcast Responsive Vibration Control System to Reduce Damage to Facilities

    2016.04
    -
    2020.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Principal investigator

Intellectual Property Rights, etc. 【 Display / hide

  • 振動制御システム

    Date applied: 2011-157501  2011.07 

    Date announced: 特開2013-23844   

    Date issued: 5828699  2015.10

    Patent, Joint

  • 建物データポリゴン化システム、その方法および建物データポリゴン化プログラム

    Date applied: 特願2001-23850  2001.01 

    Date announced: 特開2002-230589  2002.08 

    Date issued: 3394525  2003.01

    Patent

  • フランジ付中間鋼板を使用した積層ゴム支承

    Date applied: 特許出願平9-66319  1997.03 

    Date announced: 特許公開平10-266624  1998.10 

    Patent

 

Courses Taught 【 Display / hide

  • SPECIAL LECTURE ON SPACE AND ENVIRONMENT DESIGN ENGINEERING 1

    2024

  • SOCIETY, ECONOMY, CULTURE, AND ENGINEERING

    2024

  • SEMINAR IN SYSTEM DESIGN ENGINEERING

    2024

  • SAFETY ENGINEERING OF BUILDING STRUCTURE

    2024

  • PROBABILITY AND STATISTICS

    2024

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Courses Previously Taught 【 Display / hide

  • Probability and Statistics

    Keio University

    2014.04
    -
    2015.03

    Spring Semester, Lecture

  • 社会・経済・文化と工学

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester

  • 設計・計画の最適化数理

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester, Lecture

  • 空間設計製図I

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester, Seminar

  • 理工学基礎実験

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester, Laboratory work/practical work/exercise

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Social Activities 【 Display / hide

  • Research Fellow

    Institute of Industrial Science, the University of Tokyo

    2024.04
    -
    2027.03

     View Summary

    既存不適格建物の耐震改修促進に関する研究

  • 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会 データサイエンスWG 主査

    National Research Institute for Earth Science and Disaster Resilience

    2020.08
    -
    2023.03
  • 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会委員

    National Research Institute for Earth Science and Disaster Resilience

    2019.09
    -
    2023.03
  • Lecturer of Group Training Course of Seismology and Earthquake Engineering

    International Institute of Seismology and Earthquake Engineering, Building Research Institute,  (Building Research Institute (Tsukuba, Ibaraki))

    2017.02
    -
    Present

     View Summary

    Subject: Structural Response Control

  • 国立研究開発法人防災科学技術研究所 数値震動台研究開発分科会 建築WG委員

    National Research Institute for Earth Science and Disaster Resilience

    2016.05
    -
    2023.03

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Memberships in Academic Societies 【 Display / hide

  • Architectural Institute of Japan

     
  • Japan Society of Civil Engineers

     
  • Earthquake Engineering Research Institute

     
  • Institute of Social Safety Science

     
  • Japan Association for Earthquake Engineering

     

Committee Experiences 【 Display / hide

  • 2023.04
    -
    2025.03

    地震保険研究事業評価委員会委員長, 損害保険料率算出機構

  • 2022.05
    -
    Present

    Board Member, Japan Association for Earthquake Engineering

  • 2021.05
    -
    2022.05

    論文集編集委員会委員, Japan Association for Earthquake Engineering

  • 2021.04
    -
    2025.03

    荷重運営委員会信頼性工学利用小委員会委員, 日本建築学会

  • 2021.04
    -
    2025.03

    荷重運営委員会委員, 日本建築学会

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