KEIO RESEARCHERS INFORMATION SYSTEM

Message from the Faculty Member 【 Display / hide 】

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 】

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 】

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 】

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 】

Academic Degrees 【 Display / hide 】

• Doctor of Informatics, Kyoto University, Dissertation, 2002.03

Licenses and Qualifications 【 Display / hide 】

Licenses and Qualifications 【 Display / hide 】

• first-class registered architect, 1998.02

Research Areas 【 Display / hide 】

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 】

Research Keywords 【 Display / hide 】

• Earthquake Engineering

• Architectural Structural Engineering

Research Themes 【 Display / hide 】

Research Themes 【 Display / hide 】

• Broadcast Responsive Vibration Control System to Reduce Damage to Facilities, 

  2016

  -

  2019

  　View Summary

  We have developed an advanced seismic control system that maintains the functions during an earthquake by coordinating with the equipment inside the building. We constructed a method to control the response based on the video by wireless communication with the equipment. In addition, we proposed a method to identify the structural parameters based on the seismic response data of the building, design the control system to minimize the damage occurrence probability, and improve the control performance, which was applied to the existing semi-active seismic isolated building. Regarding the earthquake motion simulation method, we constructed a mathematical model considering that the seismic waveforms of earthquakes with closely located hypocenters are similar. Finally, we discovered that a building subjected to seismic motion could cause torsional resonance due to inertial force perpendicular to horizontal displacement.

• 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 】

Books 【 Display / hide 】

• Practical Learning of Modern Control Theory for Vibration Control of Building Structures

  Architectural Institute of Japan, Architectural Institute of Japan, 2025.06,  Page： 245

  Scope: 1章 実践的な学びのための準備、4章 状態方程式と伝達関数および周波数応答関数、付録,  Contact page： pp. 1-13, 96-113, 240-245 , Accepted

  　View Summary

  現代制御理論は電気、機械など工学の様々な分野で応用されており、動的システムの振る舞いを状態方程式で表現することで、内部状態の理解と制御系の設計の見通しが格段に良くなるメリットがある。建築構造物の振動制御においても、制御系設計を行うに当たり非常に強力なツールとなる。一方、現代制御理論の理解には高度な数学的知識が必要であるため、本書はプログラムを動かして計算し、結果が理論どおりになることを確かめながら学ぶことができるよう作られた。プログラミング言語としてPythonの容易さとC・Fortran並みの処理速度を兼ね備え、AI、データサイエンス、科学技術計算分野で需要が高まっているJuliaを用いている。内容は、運動方程式を状態方程式に変換する手順から始まり、構造物の振動応答を理解する上で欠かせない複素固有値解析、周波数領域および時間領域の応答解析の理論等を解説している。そして、構造物の振動制御設計の事例も多く紹介し、理論以外の観点で考慮しなければならないポイントも詳しく解説している。
  1章・4章・付録を東北大学五十子幸樹教授と共同で執筆。

• DAMAGE CLASSIFIER FOR WOODEN BUILDINGS BASED ON HYSTERESIS LOOP IMAGES USING CNN

  Chiba S., Kohiyama M., Yamashita T., World Conference on Earthquake Engineering Proceedings, 2024

  　View Summary

  Structural health monitoring (SHM), which evaluates building damage based on seismic response data, is useful for rapidly assessing damage due to earthquakes. If a reliable damage assessment system for houses can be developed, the loss of human lives caused by the aftershocks of major earthquakes can be reduced. When a target building is damaged by strong seismic ground motions, the shape of the restoring force–story drift angle curve (hysteresis loop) changes. Therefore, based on the hysteresis loop images of wooden buildings, this study proposes a method to classify the risk of collapse because of future seismic ground motions using a convolutional neural network (CNN). To develop training data, structural response analysis is conducted using “wallstat”, which is a numerical analysis software for wooden structures. SHM has more severe consequences when it misclassifies an unsafe condition as safe (miss) than when it misclassifies a safe one as unsafe (false alarm). Therefore, we propose the usage of a dataset that does not contain safe model data near the threshold value of major damage for training to decrease the possibility of misses, and we verify the effect of this. In creating the hysteresis loop images, we examine the range of the axes using two methods: fixing it at specific values and matching it to the range of the minimum and maximum values. The investigation results suggest that the trained CNN learns the changes in structural characteristics, such as stiffness reduction, damping increase, and residual displacement.

• HOW TO POPULARIZE RESILIENCE INDEX AND BCP LEVELS OF BUILDINGS: AIJ PROPOSAL

  Horie K., Takewaki I., Hayashi T., Torisawa K., Kohiyama M., World Conference on Earthquake Engineering Proceedings, 2021

  　View Summary

  The special investigation committee of Architectural Institute of Japan (AIJ) proposed a Resilience Performance Index (RPI) and a Business Continuity Plan Level Rating (BCPLR) of Buildings. RPI is a new approach to quantify the resilience performance of buildings. The proposed BCPLR classifies building resilience performance into four levels from the viewpoint of BCP. The committee also investigates how to disseminate the proposed approaches in order to promote BCP activities in various sectors. This paper addresses the investigation results by the AIJ committee. Firstly, the outline of the proposed RPI and BCPLR of buildings is introduced. RPI is defined as the degree of recovery of a building up to a certain period of days, which is expressed by a set ratio of usable floor area. RPI is an index for resilience performance. The assessment result is presented as, for example, 7 days to recover to 90% resilience performance. BCPLR is an indicator of the overall level of resilience performance of buildings based on the recovery time, which is a key factor in considering BCP, obtained from RPI. The result of assessment is presented as the number of stars such as three stars; 90% functional recovery within one week: two stars; 90% within one month: one star; 90% within six months: and no star; more than 6 months. Secondly, we examine existing systems that are expected to improve the seismic performance of buildings and/or provide incentives for disseminating BCP. We clarify the following typical incentives: 1) provision of risk information, 2) third-party certification, and 3) financial incentives, e.g., tax incentives, compensation, and penalties. Thirdly, we conduct interviews with relevant organizations and companies to identify the potential use of the proposed RPI and BCPLR. The results of the interviews confirm the importance to disseminate them to society more in order to utilize them. In particular, it is pointed out that concrete methods to improve the performance of buildings need to be explained in an easy-to-understand manner and their visibility in society need to be increased. We also investigate the applicability of RPI and BCPLR in the non-life insurance market in terms of financial incentives. The results show that, despite the challenges, lower premiums could be offered for buildings with higher resilience performance. Finally, based on the above investigation results, a leaflet is published to make better understanding for RPI and BCPLR in order to promote BCP activities.

• EXPERIMENT ON TORSIONAL RESPONSE OF SYMMETRIC STRUCTURE INDUCED BY Q–∆ RESONANCE

  Mizutori F., Yokoyama H., Kohiyama M., World Conference on Earthquake Engineering Proceedings, 2021

  　View Summary

  There are few published studies on torsional response of a symmetric structure, possibly owing to a low perceived risk. However, a symmetric structure could experience torsional vibration due to the torque generated by the inertial force (Q) perpendicular to the horizontal displacement (∆), because of geometric nonlinearity. The authors’ research group has called this the “Q–∆ effect,” and there are multiple resonance conditions of this torsional vibration. If a building satisfies one of these resonance conditions, a strong ground motion in two translational directions could induce the torsional response. In this study, we conducted an experiment to validate this Q–∆ resonance using a symmetric single-layer specimen with no eccentricity. First, resonance conditions were derived for the setup of the validation experiment. The equations of motion and vibration were based on our previous studies. In this study, we considered the input ground motion of two superposed sine waves, with frequencies equal to the two translational modes’ natural frequencies. With respect to the torsional response, we derived four resonance conditions for the torsional mode’s natural frequency. A specimen consisting of a slab, four columns, and two weights on the slab was fabricated focusing on one of the four resonance conditions in the torsional mode. The natural frequency in the torsional mode could be changed by moving the two weights on the slab. Adjusting the moment of inertia around the vertical axis passing through the center of gravity of the slab, ten patterns of natural frequencies were obtained from the one specimen. To understand the specimen’s structural and vibration characteristics, we conducted horizontal loading and free vibration experiments. All the experiments were conducted in two translational and one torsional directions. The vibration characteristics of the specimen were identified from the results of the free vibration experiments. Using a uniaxial shaking table, we conducted shaking table experiments, in which the input acceleration was two superposed sine waves. We first verified that the torsional response was very small when the specimen was excited in translational mode directions. In addition, we verified that the vibration characteristics of the specimens did not change after shaking table tests for each pattern of the specimen configuration. The validation experiments were performed by setting the specimen in the 45-degree direction from the principal axis (translational mode) direction on the shaking table. The translational response even when the natural period in the torsional mode was changed, the. The amplitude of the torsional response, however, did change, and it increased further when the torsional mode’s natural frequency was closer to the theoretically predicted resonance frequency. This result confirms that the torsional vibration of a symmetric structure is excited by an inertial force perpendicular to the horizontal displacement. However, the experimental result was larger than the simulated response based on a theoretical model. Future studies will use a specimen more suitable for this analysis and revise the prediction models to account for the second-order mode.

• 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

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Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Development and Performance Evaluation of a Bidirectional Tuned Mass Damper With Rigid Body Swing and Horizontal Spring Oscillation

  Shimizu Y., Kohiyama M.

  Japan Architectural Review (Wiley)  8 ( 1 )  2025.12

  Research paper (scientific journal), Joint Work, Corresponding author, Accepted

  　View Summary

  Super-high-rise buildings commonly utilize tuned mass dampers (TMDs) for vibration control. However, buildings with different natural periods in two horizontal directions typically require multiple TMDs, increasing weight, and costs. In this study, a bidirectional TMD (BTMD) was developed to control vibrations simultaneously in both horizontal directions of high-rise buildings with different natural periods by independently tuning natural frequencies in both directions through rotational swing and orthogonal linear oscillation of the mass component. Numerical analyses and shaking table experiments on reduced-scale building models confirmed its effectiveness in suppressing structural responses of peak and root-mean-square acceleration and displacement. The proposed BTMD offers a cost-effective and lightweight solution for enhancing the seismic resilience of high-rise buildings with different dynamic properties in two directions.

  • Access to Document (DOI)

• Q–Δ Resonance Analysis in Super-High-Rise Buildings Under Long-Period Ground Motion Using 3D Frame Models

  Masayuki Kohiyama, Fumiya Mizutori, Shiori Maki

  Japan Architectural Review (Wiley)  8 ( 1 ) 1 - 25 2025.07

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

  　View Summary

  Q–Δ resonance is the phenomenon in which the large displacement of a vertical member or structure with different stiffnesses in the two horizontal directions induces a torsional mode response owing to geometric nonlinearity and the related internal resonance. This phenomenon may have a substantial impact on super-high-rise buildings, whose horizontal displacement response can be remarkably large due to long-period ground motion. In this study, the responses of two non-eccentric super-high-rise buildings, which satisfied the Q–Δ resonance conditions, to long-period design ground motions were investigated using 3D frame models. One was a 320-m-tall, center-core, super-high-rise building model with outriggers, and the other was a 200-m-tall, center-core, super-high-rise building model without outriggers, in which the bending deformation became relatively large. Time-history response analysis was conducted considering geometric nonlinearity, and the results suggested that the torsional response induced by the Q–Δ resonance could significantly increase the horizontal acceleration response. The countermeasures against long-period ground motion in super-high-rise buildings should consider the torsional response even in non-eccentric buildings.

  • Access to Document (DOI)

• Damage Classification Method for a Wooden Building Based on Hysteresis Loop Using CNN

  CHIBA Sohki, KOHIYAMA Masayuki, and YAMASHITA Takuzo

  Journal of Japan Association for Earthquake Engineering (Japan Association for Earthquake Engineering)  25 ( 6 ) 74 - 85 2025.05

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  1884-6246

  　View Summary

  The shape of the restoring force–story drift angle relationship curve (hysteresis loop) derived from the seismic response data of a building changes depending on the structural health of the building. In this study, we utilized this characteristic for structural health monitoring and proposed a method to assess the risk of collapse due to future earthquake motions based on hysteresis loop images using a convolutional neural network (CNN). We investigated the impact of axis range and resolution settings in the proposed method, comparing the accuracy and recall of the unsafe model in each case. By adjusting the lower limit for the maximum input acceleration of the seismic wave, we achieved a recall of approximately 90% for the unsafe model. Therefore, it can be concluded that the limit of the maximum input acceleration is one of the most influential parameters in damage classification using CNN.

  • Access to Document (DOI)

• Accuracy Improvement of Damage Classifier for a Wooden Building Considering Pulse-like Seismic Ground Motions

  MIZOBUCHI Rikuto, KOHIYAMA Masayuki, and YAMASHITA Takuzo

  Journal of Japan Association for Earthquake Engineering (Japan Association for Earthquake Engineering)  25 ( 4 ) 97 - 108 2025.03

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  1884-6246

  　View Summary

  Rapid damage assessment by a structural health monitoring system is expected to prevent casualties caused by the collapse of wooden buildings due to repeated seismic motions. While neural networks are known to be a powerful tool for determining the risk of collapse based on the response records, they are not good at classifying untrained damage patterns. This study proposed a method to consider the diversity of damage patterns in the construction of a damage classifier for wooden buildings. This is achieved by using pulse-like simulated ground motions as the input ground motions for seismic response simulation of a target building model in the development of the training dataset. The effectiveness of the proposed method was validated by comparing its accuracy on test data.

  • Access to Document (DOI)

• Damage Classifier for Wooden Buildings Based on Hysteresis Loop Images Using CNN

  Chiba, S., Kohiyama, M., and Yamashita, T.

  Proc. of the 18th World Conference on Earthquake Engineering 2024 (WCEE2024)  2024.06

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

  　View Summary

  Structural health monitoring (SHM), which evaluates building damage based on seismic response data, is useful for rapidly assessing damage due to earthquakes. If a reliable damage assessment system for houses can be developed, the loss of human lives caused by the aftershocks of major earthquakes can be reduced. When a target building is damaged by strong seismic ground motions, the shape of the restoring force–story drift angle curve (hysteresis loop) changes. Therefore, based on the hysteresis loop images of wooden buildings, this study proposes a method to classify the risk of collapse because of future seismic ground motions using a convolutional neural network (CNN). To develop training data, structural response analysis is conducted using “wallstat”, which is a numerical analysis software for wooden structures. SHM has more severe consequences when it misclassifies an unsafe condition as safe (miss) than when it misclassifies a safe one as unsafe (false alarm). Therefore, we propose the usage of a dataset that does not contain safe model data near the threshold value of major damage for training to decrease the possibility of misses, and we verify the effect of this. In creating the hysteresis loop images, we examine the range of the axes using two methods: fixing it at specific values and matching it to the range of the minimum and maximum values. The investigation results suggest that the trained CNN learns the changes in structural characteristics, such as stiffness reduction, damping increase, and residual displacement.

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

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

• Resilient vibration control method considering functional continuity and rapid restoration

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2023

• Broadcast responsive vibration control system to reduce damage to facilities

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2019

• Cooperative control of a building and equipment to enhance the functional maintainability

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2015

• Autonomous cooperative control of building-elevator system under long period ground motion

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2012

• Structural assesment and evacuation guidance using small robots

  Kohiyama, Masayuki

  科学研究費補助金研究成果報告書 2012

Reviews, Commentaries, etc. 【 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

  • Access to Document (DOI)

• 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 】

Presentations 【 Display / hide 】

• Q–Δ共振が多層せん断型一軸偏心建物のねじれ応答に与える影響

  小檜山雅之

  [Domestic presentation]  日本地震工学会・大会－2025 (Jichikaikan, Naha, Okinawa) , 

  2025.12

  , 

  Oral presentation (general), Japan Association for Earthquake Engineering

  　View Summary

  水平2方向で剛性が異なる柱は幾何学的非線形性により水平変位でねじりトルクが生じる（Q–Δ効果）．2方向の並進モードの固有振動数の和または差がねじりモードの固有振動数と一致すると内部共振でねじれモードが励起する（Q–Δ共振）．本研究ではまず多層せん断型偏心建物のQ–Δ効果を定式化した．そして，Q–Δ共振条件を満足する階数20～60，偏心率0～0.15の一軸偏心建物モデルに長周期地震動を入力する時刻歴応答解析を行い，階数と偏心率が増大すると最大水平加速度が線形解析結果と乖離することを明らかにした．

• Development of Damage Classifier for a Wooden Building Using 3D Convolutional Neural Network Based on Multimodal Learning of Hysteresis Loop and Acceleration

  TORIZUKA Daichi, CHIBA Soki, KOHIYAMA Masayuki, YAMASHITA Takuzo

  [Domestic presentation]  Annual Meeting of Architectural Institute of Japan (Ito Campus, Kyushu University (Fukuoka, Fukuoka)) , 

  2025.09

  , 

  Oral presentation (general), Architectural Institute of Japan

• Design of Sustainable Disaster Reduction Activities Using Participatory Art and Citizen Science

  CHIBA Kazuki, KOHIYAMA Masayuki, ARAKI Fumika, SANO Satoshi

  [Domestic presentation]  Annual Meeting of Architectural Institute of Japan (Ito Campus, Kyushu University (Fukuoka, Fukuoka)) , 

  2025.09

  , 

  Oral presentation (general), Architectural Institute of Japan

• Proposal and Performance Validation of Bidirectional Nonlinear Energy Sink with Pretensioned Springs

  WADA Taiga, KOHIYAMA Masayuki

  [Domestic presentation]  Annual Meeting of Architectural Institute of Japan (Ito Campus, Kyushu University (Fukuoka, Fukuoka)) , 

  2025.09

  , 

  Oral presentation (general), Architectural Institute of Japan

• Development and Response Validation of a Bi-Directionally Tunable Rigid-Body-Swinging and Horizontal-Spring Hybrid Tuned Mass Damper in a Full-Scale Model

  Shimizu, Y., Kohiyama, M.

  [International presentation]  the 14th International Conference on Structural Safety and Reliability (ICOSSAR’25) (University of Southern California, Los Angels, CA) , 

  2025.06

  , 

  Oral presentation (general), The International Association for Structural Safety and Reliability

  　View Summary

  High-rise buildings can be significantly affected by external excitations such as earthquakes and wind and tuned mass dampers (TMDs) are widely used to address this issue. Conventional TMDs can only suppress a single vibration mode. Therefore, a bi-directional tuned mass damper (BTMD) has been proposed for buildings with different natural frequencies in the two horizontal directions. However, adjusting the natural frequency of a BTMD to accommodate changes and uncertainty in the natural frequencies of a building is challenging. This study proposes a novel BTMD named the hybrid tuned mass damper with rigid body swinging and horizontal spring vibration (RH-TMD) as a solution, which combines rolling motion of an auxiliary mass on a rail induced by horizontal spring and swinging motion of the rail and mass in the orthogonal direction. The natural periods can be adjusted by modifying the weight of the mass in rolling motion and the length of the pendulum in swinging motion. A rotary damper with an adjustable damping coefficient is adopted as a damping mechanism.
  First, numerical analysis using a 50-story model are conducted to examine the performance of the RH-TMD. The vibration characteristics, natural periods and damping coefficients of the RH-TMD in the two horizontal directions are optimized to minimize the root mean square response to white noise ground acceleration input. Its performance is compared with a conventional (simple) TMD with a natural period and damping coefficient optimized only in a single direction with respect to absolute acceleration and story drift responses to seismic ground motion.
  In addition, shaking table experiments are conducted using a small-scale single-layer specimen with a similarity ratio of 1:100, equipped with either an RH-TMD or a simple TMD to compare the responses to white noise ground acceleration and simulated seismic motions.
  The results of the numerical analysis and shaking table experiments validate the excellent performance of the RH-TMD in reducing absolute acceleration and story drift responses in the two horizontal directions.

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

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 】

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 】

Courses Taught 【 Display / hide 】

• SPECIAL LECTURE ON SPACE AND ENVIRONMENT DESIGN ENGINEERING 1

  2025

• SOCIETY, ECONOMY, CULTURE, AND ENGINEERING

  2025

• SEMINAR IN SYSTEM DESIGN ENGINEERING

  2025

• PROBABILITY AND STATISTICS

  2025

• MATHEMATICAL PROGRAMMING FOR DESIGN AND PLANNING

  2025

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Courses Previously Taught 【 Display / hide 】

Courses Previously Taught 【 Display / hide 】

• 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

• 空間・環境デザイン工学特別講義第１

  Keio University

  2014.04

  -

  2015.03

  , 

  Spring Semester, Lecture

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Social Activities 【 Display / hide 】

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

  , 

  2025.04

  -

  2027.03

• 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 建築WG委員

  National Research Institute for Earth Science and Disaster Resilience

  , 

  2025.04

  -

  2027.03

• 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長

  National Research Institute for Earth Science and Disaster Resilience

  , 

  2025.04

  -

  2027.03

• Research Fellow

  Institute of Industrial Science, the University of Tokyo

  , 

  2024.04

  -

  2027.03

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  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

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Memberships in Academic Societies 【 Display / hide 】

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 】

Committee Experiences 【 Display / hide 】

• 2025.05

  -

  2027.05

  Auditor of the Board of Directors , Japan Association for Earthquake Engineering

• 2025.04

  -

  2029.03

  Member of Managing Committee on Loads and Actions on Buildings, Architectural Institute of Japan

• 2025.04

  -

  2029.03

  Chair of Subcommittee on Structural Control, Architectural Institute of Japan

• 2025.04

  -

  2027.03

  Chair of Managing Committee on Loads and Actions on Buildings, Architectural Institute of Japan

• 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

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