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

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

    Anamizu R., Kohiyama M.

    Journal of Structural and Construction Engineering (Architectural Institute of Japan)  88 ( 803 ) 59 - 70 2023.01

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  13404202

     View Summary

    To evaluate Q–Δ resonance, which is a torsional resonance phenomenon caused by geometric non-linearity, we proposed a simplified model for an n-story non-eccentric building model with a shear-type structure. We designed and fabricated a four-story small-scale specimen assuming a non-eccentric steel structure with a height of 324 m, and conducted shaking table tests. As a result, the occurrence of Q–Δ resonance was confirmed as predicted by the simplified model. In addition, the simplified model reproduced the resonance amplitude in a finite element model of the specimen with the out-of-plane rotation of slabs constrained and its validity was confirmed.

  • THREE-DIMENSIONAL FRAME ANALYSIS OF Q-? RESONANCE OF CENTER-CORE BIAXIALLY SYMMETRICAL HIGH-RISE BUILDING UNDER LONG-PERIOD EARTHQUAKE MOTION

    Kohiyama M., Maki S.

    COMPDYN Proceedings (COMPDYN Proceedings)   2023

    ISSN  26233347

     View Summary

    When large displacements occur in buildings with different stiffnesses in the two horizontal directions, torsional moments are generated owing to geometric nonlinearities. Consequently, when the sum or difference of the translational mode natural frequencies in the two horizontal directions is close to the torsional mode natural frequency, the torsional mode is excited. This is known as Q-? resonance. Therefore, we created a three-dimensional frame model of a center-core high-rise building with a biaxially symmetrical plane that satisfied the Q-? resonance condition and examined whether the torsional response was excited by long-period design waves. A time-history response analysis was conducted assuming elastic response and considering geometric nonlinearities. It was confirmed that the torsional mode could be induced.

  • EXPERIMENT AND SIMULATION OF Q-? RESONANCE USING FOUR-LAYER BENDING-SHEAR TYPE SPECIMEN

    Kai R., Kohiyama M.

    COMPDYN Proceedings (COMPDYN Proceedings)   2023

    ISSN  26233347

     View Summary

    Torsional vibration of buildings subjected to earthquake motion has been studied for many years, but the torsional vibration of high-rise buildings has not yet been clarified. Many previous studies have focused on eccentricity, the mismatch between the center of gravity and the rigid center, as the cause of torsional vibration. However, in buildings with no eccentricity, torsional vibrations could be observed. The authors' research group focused on the “Q-? effect,” a phenomenon in which torsional torque is generated due to geometric nonlinearity and “Q-? resonance,” a phenomenon in which resonance occurs when the period of torsional torque generation coincides with the natural period of the torsional mode. In order to analyze the characteristics of Q-? resonance, a small-scale specimen was designed and fabricated from an 81-story high-rise building with biaxially symmetrical plans, which was reduced to four stories. As a result, the torsional response of the experimental and simulation results generally agreed, confirming that the torsional response increases when the Q-? resonance condition is satisfied. In addition, a comparison of the torsional response with a specimen with a smaller tower ratio and less bending deformation was conducted, and it was confirmed that the peak of the torsional response was steeper in the present study case.

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

    Mizobuchi R., Kohiyama M., Yamashita T.

    COMPDYN Proceedings (COMPDYN Proceedings)   2023

    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.

  • Torsional behavior of a non-eccentric structure considering the effect of shear deformations in vertical members

    Maki S., Kohiyama M.

    Japan Architectural Review (Wiley)  5 ( 4 ) 404 - 431 2022.10

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

     View Summary

    Torsional moments can occur in a column owing to the geometric nonlinearity when the top of the column undergoes a large displacement in two horizontal directions. Periodically generated torsional moments can excite the torsional mode of a building owing to the internal resonance. For high-rise buildings, there is a risk that long-period seismic motions can cause a non-negligible torsional response due to this phenomenon. To investigate this risk, this study focuses on non-eccentric single-story and two-story shear-type structural models with an aggregate column, which is assumed to be an elastic Timoshenko beam. We derived the equations of motion for the models under horizontal ground motions and confirmed that the equations were identical to those of the models with an aggregate column of an elastic Euler beam. We then performed time-history response analyses of the models satisfying the internal resonance conditions under the input ground motions of harmonic waves, Gaussian white noise acceleration, acceleration records of previous earthquakes, and a long-period design wave. The results showed that the maximum horizontal acceleration at the corner of the top floor slab could be increased by more than 60% of the acceleration at the center of the slab in the worst case.

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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

  • Three-Dimensional Frame Analysis of Q–Δ Resonance of Center-Core Biaxially Symmetrical High-Rise Building Under Long-Period Earthquake Motion

    Masayuki Kohiyama and Shiori Maki

    9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023) (Athens) , 

    2023.06

    Oral presentation (general), International Association for Computational Mechanics (IACM)

     View Summary

    When large displacements occur in buildings with different stiffnesses in the two horizontal directions, torsional moments are generated owing to geometric nonlinearities. Consequently, when the sum or difference of the translational mode natural frequencies in the two horizontal directions is close to the torsional mode natural frequency, the torsional mode is excited. This is known as Q–Δ resonance. Therefore, we created a three-dimensional frame model of a center-core high-rise building with a biaxially symmetrical plane that satisfied the Q–Δ resonance condition and examined whether the torsional response was excited by long-period design waves. A time-history response analysis was conducted assuming elastic response and considering geometric nonlinearities. It was confirmed that the torsional mode could be induced.

  • Experiment and Simulation of Q-Δ Resonance Using Four-Layer Bending Shear Type Spectrum

    Ryohei Kai and Masayuki Kohiyama

    9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023) (Athens) , 

    2023.06

    Oral presentation (general), International Association for Computational Mechanics (IACM)

     View Summary

    Torsional vibration of buildings subjected to earthquake motion has been studied for many years, but the torsional vibration of high-rise buildings has not yet been clarified. Many previous studies have focused on eccentricity, the mismatch between the center of gravity and the rigid center, as the cause of torsional vibration. However, in buildings with no eccentricity, torsional vibrations could be observed. The authors’ research group focused on the “Q–Δ effect,” a phenomenon in which torsional torque is generated due to geometric nonlinearity and “Q–Δ resonance,” a phenomenon in which resonance occurs when the period of torsional torque generation coincides with the natural period of the torsional mode. In order to analyze the characteristics of Q–Δ resonance, a small-scale specimen was designed and fabricated from an 81-story high-rise building with biaxially symmetrical plans, which was reduced to four stories. As a result, the torsional response of the experimental and simulation results generally agreed, confirming that the torsional response increases when the Q–Δ resonance condition is satisfied. In addition, a comparison of the torsional response with a specimen with a smaller tower ratio and less bending deformation was conducted, and it was confirmed that the peak of the torsional response was steeper in the present study case.

  • Bayesian Updating of Wooden Structural Parameters and Seismic Damage Classifier Using Neural Network

    Rikuto Mizobuchi, Masayuki Kohiyama, and Takuzo Yamashita

    9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023) (Athens) , 

    2023.06

    Oral presentation (general), International Association for Computational Mechanics (IACM)

     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 mod-el 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.

  • 長周期地震動によるセンターコア型二軸対称超高層建物のQ-Δ共振に関する立体骨組解析

    牧 栞里,小檜山雅之

    日本地震工学会・大会-2022 (北海道大学) , 

    2022.12

    Oral presentation (general), Japan Association for Earthquake Engineering

     View Summary

    水平2方向の剛性が異なる建物に大変位が生じると幾何学的非線形性によりねじりモーメントが発生する.そのため,水平2方向の並進モードの固有振動数の和または差がねじれモードの固有振動数と近接するとねじれモードが励起されるQ–Δ共振が発生する.そこで,Q–Δ共振条件を満足する二軸対称な平面を持つセンターコア型の超高層建物の立体骨組モデルを作成し長周期地震動でねじれ応答が励起されるか検討を行った.弾性応答を仮定し幾何学的非線形性を考慮して時刻歴応答解析を行った結果,ねじれモードが励起されることを確認した.

  • 4層曲げせん断型試験体のQ–Δ共振実験

    甲斐凌平,小檜山雅之

    日本地震工学会・大会-2022 (北海道大学) , 

    2022.12

    Oral presentation (general), 日本地震工学会

     View Summary

    塔上比が大きく曲げ変形が卓越する建物に関し,幾何学的非線形性に起因するねじれモードの内部共振現象であるQ–Δ共振の特性を分析するため,縮小試験体を設計・製作し振動台実験を行った.その結果,Q–Δ共振条件を満たす場合にねじれ応答が大きくなることを確認した.また,塔上比がより小さく曲げ変形が生じにくい試験体とのねじれ応答の比較を行った結果,前者の方がねじれ応答のピークが急峻になることが確認された.

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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

  • 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
  • 独立行政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 Prevention

    2014.04
    -
    2016.03

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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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