TOHOKU UNIVERSITY Researchers

Details of the Researcher

Home

日本語 English

Ryuta Enokida

Section

International Research Institute of Disaster Science

Job title

Associate Professor

Degree

Ph. D. (Kyoto University)
M. Sc. (Kyoto University)
B. Eng. (Kansai University)

researchmap

https://researchmap.jp/enokidaryuta

J-GLOBAL ID

201801018988183037

Research History 6

2019/10 - Present

National Research Institute for Earth Science and Disaster Resilience　E-Defense　Visiting Researcher
2019/10 - Present

Tohoku University　International Research Institute of Disaster Science Risk Evaluation and Disaster Mitigation Research Division　Associate Professor
2016/04 - 2019/10

National Research Institute for Earth Science and Disaster Resilience　E-Defense　Research Fellow
2014/04 - 2016/03

Japan Society for the Promotion of Science　Department of Mechanical Engineering, University of Bristol　Research Fellow (Abroad)
2012/04 - 2014/03

Japan Society for the Promotion of Science　Department of Engineering, Kyoto Unviersity　Research Fellow (PD)
2010/04 - 2012/03

Japan Society for the Promotion of Science　Kyoto University Disaster Prevention Research Institute　Research Fellow (DC2)

Show all Show first 5

Professional Memberships 3

The Japan Society of Mechanical Engineers
Japan Association for Earthquake Engineering
Architectural Institute of Japan

Research Areas 2

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Control and systems engineering /
Social infrastructure (civil Engineering, architecture, disaster prevention) / Structural and seismic engineering /

Papers 51

Three-storey free-standing structures with a restoration function subjected to extreme seismic ground motions in Japan

Ryuki Otsuka, Ryuta Enokida, Kohju Ikago

Soil Dynamics and Earthquake Engineering　2026/10

DOI： 10.1016/j.soildyn.2026.110395 　
SIE: Structural identification encoders for self-supervised learning of nonlinear dynamic systems using computer vision with limited physical knowledge Peer-reviewed

Haoran Pan, Jia Guo, Ryuta Enokida, Kohju Ikago

Engineering Structures　348　121796-121796　2026/02
Publisher: Elsevier BV
DOI： 10.1016/j.engstruct.2025.121796 　

ISSN： 0141-0296
Experimental examination of single-storey free-standing structures with a restoration function and seismic response estimation Peer-reviewed

Tomoki Nishio, Ryuta Enokida, Kohju Ikago

Soil Dynamics and Earthquake Engineering　201　109926-109926　2026/02
Publisher: Elsevier BV
DOI： 10.1016/j.soildyn.2025.109926 　

ISSN： 0267-7261
OVERTURNING LIMIT OF A RIGID BLOCK CONSIDERING CUMULATIVE ENERGY LOSS DUE TO REPEATED SEISMIC POUNDINGS AND GROUND CONTACTS: Analytical closed-form formulation using impulse input Peer-reviewed

TSUCHIDA Hinako, ENOKIDA Ryuta, FUJITA Kohei

Journal of Structural and Construction Engineering (Transactions of AIJ)　91　(839)　110-120　2026/01/01
Publisher: Architectural Institute of Japan
DOI： 10.3130/aijs.91.110 　

ISSN： 1340-4202

eISSN： 1881-8153

More details Close

This study focuses on the overturning behavior of rigid blocks placed near walls during seismic excitation, representing furniture inside buildings. A closed-form expression for the critical overturning condition is derived based on energy balance approach under variable-amplitude impulse inputs. The model accounts for cumulative energy loss from repeated wall impacts and ground contacts, allowing evaluation of critical input characteristics across a wide frequency range. A shaking table test using set of pulse-type input with asymmetric amplitudes is conducted to validate the proposed criteria. This approach enables comprehensive assessment of overturning limits considering block geometry and environmental factors.
Performance analysis method of iteration-based offline real-time hybrid testing: Stability and efficiency Peer-reviewed

Hao Liu, Zhenyun Tang, Ryuta Enokida

Engineering Structures　344　121402-121402　2025/12
Publisher: Elsevier BV
DOI： 10.1016/j.engstruct.2025.121402 　

ISSN： 0141-0296
Enhanced identification method for rational approximation models of unbounded soil to ensure stability in soil-structure interaction systems Peer-reviewed

Zhenyun Tang, Hao Liu, Boxin Fu, Ryuta Enokida, Xiuli Du

Soil Dynamics and Earthquake Engineering　199　109724-109724　2025/12
Publisher: Elsevier BV
DOI： 10.1016/j.soildyn.2025.109724 　

ISSN： 0267-7261
Enhancing stability and convergence of offline real-time hybrid simulation via global model-based numerical substructuring approach Peer-reviewed

Hao Liu, Zhenyun Tang, Ryuta Enokida

Mechanical Systems and Signal Processing　241　113531-113531　2025/12

DOI： 10.1016/j.ymssp.2025.113531 　

ISSN： 0888-3270
Corrigendum to “Enhancing stability and convergence of offline real-time hybrid simulation via global model-based numerical substructuring approach.” [Mech. Syst. Signal Process. 241 (2025) 113531 (Mechanical Systems and Signal Processing (2025) 241, (S0888327025012324), (10.1016/j.ymssp.2025.113531))

Liu, H., Tang, Z., Enokida, R.

Mechanical Systems and Signal Processing　241　2025/11

DOI： 10.1016/j.ymssp.2025.113578 　

ISSN： 0888-3270 1096-1216
Seismic Response Estimation of Multi-Story Structures Equipped with a Cost-Effective Earthquake Protection System Peer-reviewed

Ryuta Enokida, Cem Yenidogan

Buildings　15　(17)　3233-3233　2025/09/08
Publisher: MDPI AG
DOI： 10.3390/buildings15173233 　

eISSN： 2075-5309

More details Close

This study presents a new method for estimating the seismic responses of multi-story structures equipped with a cost-effective earthquake protection system. This system comprises a graphite lubrication interface, targeting a friction coefficient of approximately 0.2, and a feasible restoring force mechanism to suppress residual displacements. It utilizes the concept of sliding systems through conventional and affordable construction materials although it acts like a fixed-based structure until exceeding the threshold level. This multi-story estimation procedure is an extension of the recently developed procedure for estimating the shear coefficient of a single-story sliding structure with a restoring force mechanism. In the new estimation procedure, a multi-story superstructure is firstly regarded as a single-story superstructure to determine the shear coefficient. Then, the shear coefficient is distributed to each story through floor distribution coefficients considering the mass ratios. The contribution of ground motion intensity is also incorporated into the new form for improving accuracy. For this examination, incremental dynamic analyses (IDAs) are performed for three and six-story free-standing structures, both with and without a restoring force capability. The results clarify the reliability of the new estimation, which matched the IDA results within the ±20% error. The improvement in accuracy achieved by incorporating ground motion intensity is also clarified. The multi-story estimation with the improvement can reasonably estimate the seismic response of sliding structures, without dynamic analysis, solely based on structural properties. This greatly benefits the design process. Furthermore, the IDA results clarified the significant benefits of multi-story sliding structures employing graphite lubrication and properly designed restoring force mechanisms in reducing structural damage and suppressing residual sliding displacements.
Earthquake disaster resilience in Taiwan observed from the April 2024 ML 7.1 Hualien earthquake Peer-reviewed

Ryuta Enokida, Yo Fukushima, Chi-Hsien Tang, Tsung-Yi Pan, Chun-Lin Kuo, Kohju Ikago, Takako Izumi, Shinichi Kuriyama

Frontiers in Built Environment　11　2025/07/07
Publisher: Frontiers Media SA
DOI： 10.3389/fbuil.2025.1593942 　

ISSN： 2297-3362

eISSN： 2297-3362
Nonlinear Signal-Based Control for a Shake Table Supporting a Heavy Multi-Storey Nonlinear Structure Peer-reviewed

Ryuta Enokida, Kohju Ikago, Koichi Kajiwara

Earthquake Engineering and Structural Dynamics　54　(4)　1251-1269　2025/04/10

DOI： 10.1002/eqe.4308 　

ISSN： 0098-8847

eISSN： 1096-9845
Development of low-cost rolling base isolation system for seismic protection of rubble stone masonry buildings in Himalayan Mountain range Peer-reviewed

Jiro Takagi, Takeshi Masui, Yoshikazu Araki, Kohju Ikago, Sanjay Pareek, Sanghun Lee, Yusuke Suzuki, Ryuta Enokida, Jia Guo, Kshitij C. Shrestha, Iori Fukuda, Hayato Miyagawa

Frontiers in Built Environment　10　2024/11/22
Publisher: Frontiers Media SA
DOI： 10.3389/fbuil.2024.1495051 　

ISSN： 2297-3362

eISSN： 2297-3362

More details Close

A low-cost rolling base isolation system (RBIS) for rubble stone masonry buildings in the Himalayan mountain range was presented and the feasibility of RBIS in the initial conditions installed in the buildings were evaluated in experiments and simple numerical simulations. The base isolation layer is composed of styrofoam, concrete slab and cast-iron balls. The styrofoam and concrete slab are the upper and lower elements of the isolation layer. The styrofoam boards are used for the embedment of the cast-iron balls and form panels for the casting concrete of the tie beams above the isolation layer. In the case of large earthquakes, these balls roll and horizontally squeeze into the styrofoam boards. The proposed RBIS satisfies two issues for the base isolation system in rubble stone masonry buildings in the Himalayan Mountain range; i.e. (i) use of locally available materials in the isolation layer and (ii) simple construction procedure of the isolation layer by local workers. The quasi-static cyclic loading experiments were conducted. The rolling coefficients of the RBIS were 0.06–0.14. Shaking table experiments were also conducted. It was found that the recorded maximum accelerations are approximately 0.2g. The restoring force characteristics of RBIS in the shaking table experiment were created and the behavior of the experiment was simulated by the response history analyses (RHAs). The behavior of the rubble stone masonry building associated with RBIS under large earthquakes was also evaluated in RHAs. Assuming that the traditional masonry buildings can resist the earthquake ground motions with a PGA under 0.15g, the buildings installed with RBIS can resist the ground motions with a PGA under 0.5g.
Feasibility of sliding base isolation for rubble stone masonry buildings in the Himalayan Mountain range Peer-reviewed

Yusuke Suzuki, Mayako Tada, Ryuta Enokida, Jiro Takagi, Yoshikazu Araki, Sanjay Pareek, Sanghun Lee, Kohju Ikago, Jia Guo, Kshitij C. Shrestha, Iori Fukuda, Takeshi Masui

Frontiers in Built Environment　10　2024/07/31
Publisher: Frontiers Media SA
DOI： 10.3389/fbuil.2024.1432912 　

ISSN： 2297-3362

eISSN： 2297-3362

More details Close

This paper studied the feasibility of a sliding base isolation layer to be used in rubble stone masonry buildings in rural areas in the Himalayan Mountain range to provide robust protection to important building like schools against strong earthquakes. In this paper, we carried out on-site investigations, quasi-static tests, and shaking table tests focusing on constructability as well as isolation performance. From the results of the feasibility study, the combination of styrofoam, concrete slab, and grease was found to be the most feasible to be used as the upper element, the lower element, and the lubricant, respectively, in the sliding isolation layer. The key features of the present sliding base isolation layer are: 1) the use of the materials that exist in rural mountain areas or those that can be easily transported from the neighboring towns and cities and 2) ease of construction and minimal change from the current construction practice. From the shaking table tests, we identified the conditions, e.g., grease amount, grease type, normal stress at the interface, and roughness of concrete slab surface, to achieve dynamic friction coefficients ranging from 0.08 to 0.16, suitable for sliding base isolation.
Stability prediction method of time-varying real-time hybrid testing system on vehicle-bridge coupled system Peer-reviewed

Hao Liu, Zhenyun Tang, Ryuta Enokida

Mechanical Systems and Signal Processing　216　111463-111463　2024/07
Publisher: Elsevier BV
DOI： 10.1016/j.ymssp.2024.111463 　

ISSN： 0888-3270

eISSN： 1096-1216
山形体育館における地震時のTMD制振効果確認実験 Peer-reviewed

Susumu YOSHINAKA, Jun FUJIWARA, Ryuta ENOKIDA, Makoto YAMAKAWA, Akiko KISHIDA, Junya ASANO, Kentaro OKA, Amito USAMI

AIJ Journal of Technology and Design　30　(75)　644-649　2024/06/20
Publisher: Architectural Institute of Japan
DOI： 10.3130/aijt.30.644 　

ISSN： 1341-9463

eISSN： 1881-8188
Experimental Examinations of Free-Standing Structures with/without Cushion Stoppers for the Suppression of the Residual Sliding Displacement Peer-reviewed

Ryuta Enokida, Nishio Tomoki, Kohju Ikago

Lecture Notes in Civil Engineering　533 LNCE　400-409　2024

DOI： 10.1007/978-3-031-66888-3_32 　

ISSN： 2366-2557

eISSN： 2366-2565
E-Defense Shake Table Experiments Implemented by NIED and Collaborative Research Projects in 2005–2022 Peer-reviewed

Ryota Nishi, Yohsuke Kawamata, Ryuta Enokida, Takahito Inoue, Kentaro Tabata

Journal of Disaster Research　18　(5)　492-512　2023/08/01
Publisher: Fuji Technology Press Ltd.
DOI： 10.20965/jdr.2023.p0492 　

ISSN： 1881-2473

eISSN： 1883-8030
Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations Peer-reviewed

Koichi Kajiwara, Akiko Kishida, Jun Fujiwara, Ryuta Enokida

Frontiers in Built Environment　9　2023/07/20
Publisher: Frontiers Media SA
DOI： 10.3389/fbuil.2023.1201048 　

ISSN： 2297-3362

eISSN： 2297-3362
Performance Examination of Nonlinear Signal-Based Control in Shake Table Experiments with Sliding Structures Peer-reviewed

Ryuta Enokida, Kohju Ikago, Jia Guo, Koichi Kajiwara

Structural Control and Health Monitoring　2023　1-21　2023/06/28

DOI： 10.1155/2023/9526244 　

ISSN： 1545-2255

eISSN： 1545-2263
Enhancements of Nonlinear Substructuring Control for Shake Table Experiments on Severely Damaged Structures Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

Structural Control and Health Monitoring　2023　1-23　2023/06/06
Publisher: Hindawi Limited
DOI： 10.1155/2023/6648638 　

ISSN： 1545-2255

eISSN： 1545-2263

More details Close

This study introduces enhancements for nonlinear substructuring control (NLSC) to achieve simultaneous control of acceleration and displacement in shake table substructuring experiments with severely damaged structures. Although shake table control is greatly affected by a specimen placed on its top and its nonlinear characteristics, accurate control, even with nonlinear characteristics, is essential for experimental purposes. The NLSC was developed for a dynamically substructured system (DSS) scheme involving nonlinear substructures, and its first application to a shake table experiment was performed on a one-storey steel frame. In the experiment, NLSC realised simultaneous control of table acceleration and displacement with a slight nonlinear characteristic within the frame, although its performance degraded as the nonlinearity became stronger. To address this degradation issue, this study introduces two techniques for enhancing NLSC shake table substructuring experiments. One is a composite filtering technique to minimise noise-contaminating displacement data fed back to the table control so that the error feedback action in NLSC can be fully utilised. The other involves a new linear model that is assumed to be more highly damped than the actual system to enhance the stability robustness of NLSC against nonlinear characteristics. After a series of numerical examinations, this study experimentally examined the enhancements on actual shake table experiments using a steel frame. Using the NLSC with the enhancements, a substructuring experiment was successfully conducted; moreover, the NLSC realised simultaneous control of the table acceleration and displacement with nearly 100% accuracy, even with severe nonlinear characteristics.
Nonlinear signal‐based control for shake table experiments with sliding masses Peer-reviewed

Ryuta Enokida, Kohju Ikago, Jia Guo, Koichi Kajiwara

Earthquake Engineering and Structural Dynamics　2023/03/02
Publisher: Wiley
DOI： 10.1002/eqe.3852 　

ISSN： 0098-8847

eISSN： 1096-9845
An acceleration-oriented form of simple piecewise linearisation in time series to assess seismically damaged structures Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

Frontiers in Built Environment　9　2023/01/23

DOI： 10.3389/fbuil.2023.1129403 　

ISSN： 2297-3362

eISSN： 2297-3362
Combination of physics-based and data-driven modeling for nonlinear structural seismic response prediction through deep residual learning Peer-reviewed

Jia Guo, Ryuta Enokida, Dawei Li, Kohju Ikago

Earthquake Engineering and Structural Dynamics　52　(8)　2429-2451　2023
Publisher: Wiley
DOI： 10.1002/eqe.3863 　

ISSN： 0098-8847

eISSN： 1096-9845
Enhancement of nonlinear signal-based control to estimate earthquake excitations from absolute acceleration responses of nonlinear structures Peer-reviewed

Ryuta Enokida

Mechanical Systems and Signal Processing　181　109486-109486　2022/12
Publisher: Elsevier BV
DOI： 10.1016/j.ymssp.2022.109486 　

ISSN： 0888-3270
Numerically disturbed shake table experimentation to examine nonlinear signal-based control Peer-reviewed

Ryuta Enokida, Kohju Ikago, Koichi Kajiwara

Frontiers in Built Environment　8　2022/08/25
Publisher: Frontiers Media SA
DOI： 10.3389/fbuil.2022.964394 　

ISSN： 2297-3362

eISSN： 2297-3362
Nonlinear substructuring control for simultaneous control of acceleration and displacement in shake table substructuring experiments Peer-reviewed

Ryuta Enokida

STRUCTURAL CONTROL & HEALTH MONITORING　29　(2)　2022/02

DOI： 10.1002/stc.2882 　

ISSN： 1545-2255

eISSN： 1545-2263
Suppression of residual sliding displacement of flat-sliding structures by cushion stoppers Peer-reviewed

Ryuta Enokida

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING　150　106905-106905　2021/11

DOI： 10.1016/j.soildyn.2021.106905 　

ISSN： 0267-7261

eISSN： 1879-341X
Changes in the Dynamic Characteristics of a Small-Scale Gymnasium Model Due to Simulated Earthquake Damage Peer-reviewed

Jun Fujiwara, Akiko Kishida, Takashi Aoki, Ryuta Enokida, Koichi Kajiwara

JOURNAL OF DISASTER RESEARCH　16　(7)　1074-1085　2021/10

DOI： 10.20965/jdr.2021.p1074 　

ISSN： 1881-2473

eISSN： 1883-8030
Simple piecewise linearisation in time series for time-domain inversion to estimate physical parameters of nonlinear structures Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

STRUCTURAL CONTROL & HEALTH MONITORING　27　(10)　2020/10

DOI： 10.1002/stc.2606 　

ISSN： 1545-2255

eISSN： 1545-2263
Basic examination of two substructuring schemes for shake table tests Peer-reviewed

Ryuta Enokida

STRUCTURAL CONTROL & HEALTH MONITORING　27　(4)　2020/04

DOI： 10.1002/stc.2497 　

ISSN： 1545-2255

eISSN： 1545-2263
Nonlinear signal-based control for single-axis shake tables supporting nonlinear structural systems Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

STRUCTURAL CONTROL & HEALTH MONITORING　26　(9)　2019/09

DOI： 10.1002/stc.2376 　

ISSN： 1545-2255

eISSN： 1545-2263
Stability of nonlinear signal-based control for nonlinear structural systems with a pure time delay Peer-reviewed

Ryuta Enokida

STRUCTURAL CONTROL & HEALTH MONITORING　26　(8)　2019/08

DOI： 10.1002/stc.2365 　

ISSN： 1545-2255

eISSN： 1545-2263
A comparative study of hybrid simulation and dynamical substructuring system schemes for shake table tests Peer-reviewed

Ryuta Enokida

Journal of Physics: Conference Series　1264　(1)　2019

DOI： 10.1088/1742-6596/1264/1/012005 　

ISSN： 1742-6588

eISSN： 1742-6596
Seismic Damage Reduction of a Structural System based on Nontraditional Sliding Interfaces with Graphite Lubrication Peer-reviewed

Ryuta Enokida, Takuya Nagae

JOURNAL OF EARTHQUAKE ENGINEERING　22　(4)　666-686　2018

DOI： 10.1080/13632469.2016.1264326 　

ISSN： 1363-2469

eISSN： 1559-808X
Experiences, accomplishments, lessons, and challenges of E-defense-Tests using world's largest shaking table Peer-reviewed

Masayoshi Nakashima, Takuya Nagae, Ryuta Enokida, Koichi Kajiwara

JAPAN ARCHITECTURAL REVIEW　1　(1)　4-17　2018/01

DOI： 10.1002/2475-8876.10020 　

ISSN： 2475-8876
Nonlinear substructuring control for parameter changes in multi-degree-of-freedom systems Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

JOURNAL OF SOUND AND VIBRATION　407　63-81　2017/10

DOI： 10.1016/j.jsv.2017.06.029 　

ISSN： 0022-460X

eISSN： 1095-8568
Nonlinear signal-based control with an error feedback action for nonlinear substructuring control Peer-reviewed

Ryuta Enokida, Koichi Kajiwara

JOURNAL OF SOUND AND VIBRATION　386　21-37　2017/01

DOI： 10.1016/j.jsv.2016.09.023 　

ISSN： 0022-460X

eISSN： 1095-8568
Application of the nonlinear substructuring control method to nonlinear 2-degree-of-freedom systems Peer-reviewed

Ryuta Enokida, David Stoten, Koichi Kajiwara

13TH INTERNATIONAL CONFERENCE ON MOTION AND VIBRATION CONTROL (MOVIC 2016) AND THE 12TH INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN STRUCTURAL DYNAMICS (RASD 2016)　744　(1)　2016/10/03

DOI： 10.1088/1742-6596/744/1/012039 　

ISSN： 1742-6588

eISSN： 1742-6596
Stability analysis and comparative experimentation for two substructuring schemes, with a pure time delay in the actuation system Peer-reviewed

Ryuta Enokida, David Stoten, Koichi Kajiwara

JOURNAL OF SOUND AND VIBRATION　346　(1)　1-16　2015/06

DOI： 10.1016/j.jsv.2015.02.024 　

ISSN： 0022-460X

eISSN： 1095-8568
A nonlinear signal-based control method and its applications to input identification for nonlinear SIMO problems Peer-reviewed

Ryuta Enokida, Izuru Takewaki, David Stoten

JOURNAL OF SOUND AND VIBRATION　333　(24)　6607-6622　2014/12

DOI： 10.1016/j.jsv.2014.07.014 　

ISSN： 0022-460X

eISSN： 1095-8568
Comparative results for DSS and hybrid testing for a base isolated structure with rubber bearings

Ryuta Enokida, David Stoten

MOVIC 2014 - 12th International Conference on Motion and Vibration Control　2014
Publisher: Japan Society of Mechanical Engineers
Application of graphite lubrication for column base in free standing steel structure Peer-reviewed

Ryuta Enokida, Takuya Nagae, Masahiro Ikenaga, Michitaka Inami, Masayoshi Nakashima

Journal of Structural and Construction Engineering　78　(685)　435-444　2013/03
Publisher: 日本建築学会
DOI： 10.3130/aijs.78.435 　

ISSN： 1340-4202 1881-8153
Nonlinear SDOF structural control by minimal control synthesis without reference model Peer-reviewed

Koichi Kajiwara, Ryuta Enokida, Masayoshi Nakashima

Journal of Structural and Construction Engineering　77　(682)　1863-1872　2012/12
Publisher: 日本建築学会
DOI： 10.3130/aijs.77.1863 　

ISSN： 1340-4202 1881-8153
Development of hybrid floor isolation system with semi-active control

Shi, Y, Enokida, R, Sato, E, Nakashima, M

Proceedings of the 15th WCEE 2012　15　(15)　2012
Development of free standing steel structure using kinematic friction of steel-mortar

Enokida, R, Inami, M, Nakashima, M, Nagae, T, Ikenaga, M

Proceedings of the 15th WCEE 2012　15　(15)　2012
Kinematic friction and seismic responses of free standing steel structures on mortar base Peer-reviewed

Ryuta Enokida, Masahiro Ikenaga, Takuya Nagae, Masayoshi Nakashima

Journal of Structural and Construction Engineering　76　(661)　527-534　2011/03
Publisher: 日本建築学会
DOI： 10.3130/aijs.76.527 　

ISSN： 1340-4202 1881-8153
振動台限界を超える高振動数入力を実現する振動台実験手法 Peer-reviewed

榎田竜太, 梶原浩一, 長江拓也, 中島正愛

第13回日本地震工学シンポジウム論文集　13　(13)　2266-2270　2010
Development of Shaking Table Test Techniques to Realize Large Responses and to Control the Reproduced Response

Enokida, R, Ji, X, Kajiwara, K, Nagae, T, Nakashima, M

The Fifth World Conference on Structural Control and Monitoring　5　(5)　2010
POUNDING SHAKING TABLE TEST TECHNIQUES TO REALIZE HIGH FREQUENCY INPUT OVER THE REPRODUCIBLE FREQUENCY OF TABLES Peer-reviewed

Ryuta ENOKIDA, Kouichi KAJIWARA, Takuya NAGAE, Masayoshi NAKASHIMA

Journal of Structural and Construction Engineering (Transactions of AIJ)　75　(657)　1975-1982　2010
Publisher: Architectural Institute of Japan
DOI： 10.3130/aijs.75.1975 　

ISSN： 1340-4202

eISSN： 1881-8153
A substructure shaking table test for reproduction of earthquake responses of high-rise buildings Peer-reviewed

Xiaodong Ji, Kouichi Kajiwara, Takuya Nagae, Ryuta Enokida, Masayoshi Nakashima

EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS　38　(12)　1381-1399　2009/10

DOI： 10.1002/eqe.907 　

ISSN： 0098-8847

eISSN： 1096-9845
Development of shaking table experiment method ot reproduce responses of high-rise buildings under ground motion Peer-reviewed

Ryuta Enokida, Kouichi Kajiwara, Takuya Nagae, Xiaodong Ji, Masayoshi Nakashima

Journal of Structural and Construction Engineering　73　(634)　2111-2117　2008/12
Publisher: 一般社団法人日本建築学会
DOI： 10.3130/aijs.73.2111 　

ISSN： 1340-4202 1881-8153

Show all ︎Show first 5

Misc. 52

OVERTURNING LIMIT OF A RIGID BLOCK CONSIDERING CUMULATIVE ENERGY LOSS DUE TO REPEATED SEISMIC POUNDINGS AND GROUND CONTACTS Analytical closed-form formulation using impulse input

土田陽奈子, 榎田竜太, 藤田皓平

日本建築学会構造系論文集(Web)　91　(839)　2026

ISSN： 1881-8153
実大4 層鉄骨造のE-Defense 実験に基づく直置き型構造物の数値解析

村上剛基, 榎田竜太, 大塚竜紀, 五十子幸樹

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
直置き型構造物の強震動に対する地震応答低減効果の実験的検証その2 3 層直置き型構造物

大塚竜紀, 洲鎌星, 榎田竜太, 小山慶樹, 安井健治, 五十子幸樹, 山上聡, 村上剛基

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
直置き型構造物の強震動に対する地震応答低減効果の実験的検証その1 すべり面への上下地震動の影響検証

小山慶樹, 洲鎌星, 榎田竜太, 大塚竜紀, 安井健治, 五十子幸樹, 山上聡, 村上剛基

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
壁との衝突を考慮した非対称振幅入力に対する剛体の転倒限界振動実験による検証

土田陽奈子, 榎田竜太, 藤田皓平

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
魚骨モデルを用いたデータ逆解析による動特性1 質点系の振動台実験による基礎的検討

Koichi KAJIWARA, Jun FUJIWARA, Ryuta ENOKIDA

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
低コスト転がり免震機構を挿入した石積組積造建物の地震応答

宮川隼人, 高木次郎, 桝井健, 荒木慶一, 五十子幸樹, PAREEK Sanjay, LEE Sanghun, 鈴木裕介, 榎田竜太, GUO Jia, 山出美弥, 福田伊織

Proceedings of Architectural Institute of Japan　2025　2025/09

ISSN： 1883-9363
Deep autoencoder neural networks for system identification in nonlinear dynamics from raw images

Guo JIA, Haoran PAN, Ryuta ENOKIDA, Kohju Ikago

Proceedings of Architectural Institute of Japan　2025/09
実大4層鉄骨造のE-Defense実験に基づく直置き型構造物の数値解析（標準三波）

村上剛基, 榎田竜太, 大塚竜紀, 五十子幸樹

日本建築学会第88回東北支部研究報告会　(88)　2025/06
Validation of a Dynamic Property Identification Method Using a Fishbone Model: Shaking Table Test of a Single-Layer Structure

梶原浩一, 藤原淳, 榎田竜太

Dynamics & Design Conference (CD-ROM)　2025　35　2025
Publisher: 一般社団法人日本機械学会
DOI： 10.1299/jsmedmc.2025.35 　

ISSN： 2424-2993

eISSN： 2424-2993
数値解析による実大3層鉄骨造建物の地震応答再現と直置き型構造物化の効果検証

大塚竜紀, 榎田竜太, 西尾智樹, 五十子幸樹

日本建築学会第87回東北支部研究報告会　(87)　2024/06

ISSN： 2185-2294
SHAKING TABLE TEST TO VERIFY VIBRATION CONTROL EFFECT OF TMDS FOR A GABLE ROOF UNDER SEISMIC LOADINGS

吉中進, 藤原淳, 榎田竜太, 山川誠, 岸田明子, 浅野潤也, 岡健太郎, 宇佐見阿弥人

日本建築学会技術報告集(Web)　30　(75)　2024

ISSN： 1881-8188
Numerical Examination on the Seismic Performance of a Free-Standing Three-Story Steel Structure

大塚竜紀, 榎田竜太, 西尾智樹, 五十子幸樹

日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)　2024　2024

ISSN： 1883-9363
Comprehensive seismic performance assessment testing: Part 38: Dynamic characteristics assessment of building specimen

藤原淳, 岸田明子, 梶原浩一, 西崚汰, 榎田竜太

日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)　2024　2024

ISSN： 1883-9363
Shaking table test to verify vibration control effect of TMDs for a scaled-down gable roof model: Part2: Shaking table tests of a single TMD device only and a scaled-down gable roof model with two TMDs

岡健太郎, 山川誠, 吉中進, 岸田明子, 藤原淳, 浅野潤也, 浅野潤也, 榎田竜太, 宇佐見阿弥人

日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)　2023　2023

ISSN： 1883-9363
浸水被害も含めた,新たな医療機関の事業継続計画(BCP)策定に資する研究頻発・激甚化する豪雨水害とBCPのあり方に関する研究

佐々木宏之, 橋本雅和, MAS Erick, 榎田竜太, 丸谷浩明, 森口周二

浸水被害も含めた、新たな医療機関の事業継続計画(BCP)策定に資する研究令和4年度総括研究報告書(Web)　2023
Shaking table tests to examine the suppression of residual sliding displacement of a one-story free-standing structure equipped with cushion rubbers

西尾智樹, 榎田竜太, 福田伊織, 五十子幸樹

日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)　2023　2023

ISSN： 1883-9363
An experimental study to suppress residual sliding displacement of a one-story free-standing structure under earthquakes by cushion rubbers

西尾智樹, 榎田竜太, 福田伊織, 五十子幸樹

日本建築学会東北支部研究報告集(CD-ROM)　(86)　2023

ISSN： 2185-2294
Simple Piecewise Linearisation in Time Series to Estimate Physical Parameters of Seismically Damaged Structures

榎田竜太, 梶原浩一

理論応用力学講演会講演論文集(Web)　66th　189　2022
Publisher: National Committee for IUTAM
DOI： 10.11345/japannctam.66.0_189 　

More details Close

This study introduces an application of simple piece-wise linearization in time series (SPLiTS) to a physical parameter estimation of a seismically damaged structure. SPLiTS piecewisely linearises a nonlinear structure, based on half-cycle waves in the displacement response data whose central-point shift effects are minimised. In its application to experimental data of a one-storey steel structure excited by a shake table test, SPLiTS reasonably estimates its physical parameters that show damping increased and stiffness decreased in time series due to the occurrence of yielding. It clarifies the efficiency of SPLiTS to physical parameter estimations of structures damaged by earthquake excitations.
Basic Study on the Development of a Seismic Isolation System for Masonry Buildings in Developing Countries

多田麻也子, 高木次郎, 荒木慶一, 五十子幸樹, PAREEK Sanjay, LEE Sanghun, 桝井健, 鈴木裕介, 榎田竜太, GUO Jia, 福田伊織

日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)　2020　2020

ISSN： 1883-9363
Wireless Sensor System for Multi-point Measurement of Structural Vibration in Buildings

佐方連, KIM Suhwuk, 榎田竜太, 山下拓三, 梶原浩一

電子情報通信学会技術研究報告　118　(474(RCS2018 282-338)(Web))　2019

ISSN： 0913-5685
21279 鋳鉄柱脚および鋼柱脚のすべり摩擦性状に関する振動台実験

西崚汰, 長江拓也, 榎田竜太, 福和伸夫, 平井敬

構造II　2017　(2017)　557-558　2017/07/20
Publisher: 日本建築学会
ISSN： 1883-9363
耐震構造実験における非線形制御

榎田竜太

構造力学講究録　(62)　2017
21536 Test on impact of free standing steel structure against rubber : Part 1. Shaking table tests on reduction of sliding drift

YAMAZAKI Tomoya, INAMI Michitaka, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012　1071-1072　2012/09/12
Publisher: Architectural Institute of Japan
ISSN： 1883-9363
21546 Experimental verification of minimal control synthesis without reference model for nonlinear structural control

ENOKIDA Ryuta, Kajiwara Koichi, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012　1091-1092　2012/09/12
Publisher: Architectural Institute of Japan
ISSN： 1883-9363
21537 Test on impact of free standing steel structure against rubber : Part 2. Numerical simulation

INAMI Michitaka, YAMAZAKI Tomoya, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012　1073-1074　2012/09/12
Publisher: Architectural Institute of Japan
ISSN： 1883-9363
2039 Development of minimal control synthesis without reference model and control of nonlinear SDOF system

ENOKIDA Ryuta, KAJIWARA Koichi, NAKASHIMA Masayoshi

(52)　153-156　2012/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
2058 Reduction on sliding drift for free standing steel structure

INAMI Michitaka, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

(52)　229-232　2012/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
21208 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part2. Graphite lubrication and shaking table tests

YAMAZAKI Tomoya, ENOKIDA Ryuta, INAMI Michitaka, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011　415-416　2011/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21209 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part3. Reduction of sliding displacement

INAMI Michitaka, ENOKIDA Ryuta, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011　417-418　2011/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21207 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part1. Relation between friction coefficient and base shear coefficient and introduction of shaking table tests

ENOKIDA Ryuta, INAMI Michitaka, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011　413-414　2011/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
2023 Free standing steel structures placed on base mortar and their seismic responses : Part2. Reduction experiment of friction coefficient of steel-mortar and reduction experiment of sliding displacement

INAMI Michitaka, ENOKIDA Ryuta, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

(51)　89-92　2011/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
2022 Free standing steel structures placed on base mortar and their seismic responses : Part1. Kinematic friction of steel-mortar and stick slip behavior

ENOKIDA Ryuta, INAMI Michitaka, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

(51)　85-88　2011/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
21023 Proposal on shaking table test technique to promote high frequency response : Part2. Experimental validation

YAMAZAKI Tomoya, ENOKIDA Ryuta, NAGAE Takuya, SHI Yundong, KAJIWARA Koichi, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010　45-46　2010/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21022 Proposal on shaking table test technique to promote high frequency response : Part1. Concept of pounding shaking table test technique

ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, SHI Yundong, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010　43-44　2010/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21024 Proposal on shaking table test technique to promote high frequency response : Part3. Comparisons with simulation and experimental results

SHI Yundong, ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010　47-48　2010/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
2019 Proposal of shaking table test technique to enhance the reproducible frequency ranges of tables : Part2. Experimental validation of the shaking table test technique

SHI Yundong, ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

(50)　73-76　2010/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
2018 Proposal of shaking table test technique to enhance the reproducible frequency ranges of tables : Part1. Proposal of pounding shaking table test technique

ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, SHI Yundong, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

(50)　69-72　2010/05/25
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
超高層建物の地震時床応答を再現する振動台実験手法の開発

榎田竜太

京都大学防災研究所年報(CD-ROM)　(53)　2010

ISSN： 0386-412X
高層建物大振幅応答再現をめざすサブストラクチャ振動台実験手法の提案と室内安全性検証への適用(優秀修士論文賞推薦理由,2009年日本建築学会優秀卒業論文賞日本建築学会優秀修士論文賞)

榎田竜太

建築雑誌　124　(1593)　107-107　2009/08/20
Publisher: 一般社団法人日本建築学会
ISSN： 0003-8555
21303 Development of shaking table test techniques to reproduce seismic responses of high-rise buildings including higher modes

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, JI Xiaodong, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2009　(0)　605-606　2009/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
2015 Shaking table test for reproduction of seismic responses of high-rise buildings including higher modes

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, JI Xiaodong, NAKASHIMA Masayoshi

0　(49)　57-60　2009/05/22
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
Development ofshakingtabletest techniquestorealize large responses and evaluation of safety of a high-rise building

Ryuta Enokida, Takuya Nagae, Kouichi Kajiwara, Xiaodong Ji, Masayoshi Nakashima

Journal of Structural and Construction Engineering　74　(637)　467-476　2009/03
Publisher: Architectural Institute of Japan
DOI： 10.3130/aijs.74.467 　

ISSN： 1340-4202 1881-8153
21091 Full-Scale Substructure Shaking Table Tests to Reproduce Responses of High-Rise Buildings : Part 1. Control Algorithms for Substructure Shaking Table Tests

JI Xiaodong, ENOKIDA Ryuta, KAJIWARA Kouichi, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008　(0)　181-182　2008/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21093 Full-scale substructure shaking table tests to reproduce responses of high-rise buildings : Part 3 Shaking table tests considering nonlinearity of rubber bearings to reproduce responses of high-rise buildings

ENOKIDA Ryuta, JI Xiaodong, KAJIWARA Koichi, NAGAE Takuya, NAKASHIMA Masayashi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008　(0)　185-186　2008/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21092 Full-scale substructure shaking table tests to reproduce responses of high-rise buildings : Part 2 Development of techniques for shaking table test to realize large responses of high-rise buildings

NAKASHIMA Masayoshi, ENOKIDA Ryuta, JI Xiaodong, NAGAE Takuya, KAJIWARA Koichi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008　(0)　183-184　2008/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
22415 System Identification and Seismic Responses in Elastic Range : E-Defense Shaking Table Test for Evaluation of Seismic Performance of High-Rise Building Part. 4

Kajiwara Kouichi, Chung YuLin, Enokida Ryuta, Ji Xiaodong, Nagae Takuya, Fukuyama Kunio, Inoue Takahito, Nakashima Masayoshi, Hidaka Toko

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures　2008　(0)　829-830　2008/07/20
Publisher: Architectural Institute of Japan
ISSN： 1341-447X
2005 Control Algorithms for Substructure Shaking Table Test to Reproduce Seismic Responses of Large Structures(構造)

JI Xiaodong, ENOKIDA Ryuta, KAJIWARA Kouichi, NAGAE Takuya, NAKASHIMA Masayoshi

(48)　17-20　2008/05/23
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
2003 Development of techniques for shaking table test to realize large responses of high-rise buildings

ENOKIDA Ryuta, JI Xiaodong, NAGAE Takuya, KAJIWARA Koichi, NAKASHIMA Masayoshi

0　(48)　9-12　2008/05/23
Publisher: Architectural Institute of Japan
ISSN： 1345-6660
21187 Attenuation Relations for Random Ground Motion Model and Earthquake Input Energy Spectrum : Part1 Estimation of Attenuation Relations

TAKAMATSU Kengo, ENOKIDA Ryuta, MATSUDA Satoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2007　373-374　2007/07/31
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
21188 Attenuation Relations for Random Ground Motion Model and Earthquake Input Energy Spectrum : Part2. Verification ofAttenuation Relations

ENOKIDA Ryuta, TAKAMATSU Kengo, MATSUDA Satoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2007　375-376　2007/07/31
Publisher: Architectural Institute of Japan
ISSN： 1341-4461
2002 Attenuation relations for Random Ground Motion Model and Earthquake Input Energy Spectrum

ENOKIDA Ryuta, TAKAMATSU Kengo, MATSUDA Satoshi

(47)　5-8　2007/05/22
Publisher: Architectural Institute of Japan
ISSN： 1345-6660

Show all ︎Show first 5

Presentations 27

21536 Test on impact of free standing steel structure against rubber : Part 1. Shaking table tests on reduction of sliding drift

YAMAZAKI Tomoya, INAMI Michitaka, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012/09/12
21537 Test on impact of free standing steel structure against rubber : Part 2. Numerical simulation

INAMI Michitaka, YAMAZAKI Tomoya, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012/09/12
21546 Experimental verification of minimal control synthesis without reference model for nonlinear structural control

ENOKIDA Ryuta, Kajiwara Koichi, NAKASHIMA Masayoshi

Summaries of technical papers of annual meeting　2012/09/12
2039 Development of minimal control synthesis without reference model and control of nonlinear SDOF system

ENOKIDA Ryuta, KAJIWARA Koichi, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2012/05/25
2058 Reduction on sliding drift for free standing steel structure

INAMI Michitaka, ENOKIDA Ryuta, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2012/05/25
21207 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part1. Relation between friction coefficient and base shear coefficient and introduction of shaking table tes

ENOKIDA Ryuta, INAMI Michitaka, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011/07/20
21208 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part2. Graphite lubrication and shaking table tests

YAMAZAKI Tomoya, ENOKIDA Ryuta, INAMI Michitaka, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011/07/20
21209 Reduction of friction coefficient between steel mortar by graphite lubrication and the seismic responses of free standing steel structure : Part3. Reduction of sliding displacement

INAMI Michitaka, ENOKIDA Ryuta, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2011/07/20
2022 Free standing steel structures placed on base mortar and their seismic responses : Part1. Kinematic friction of steel-mortar and stick slip behavior

ENOKIDA Ryuta, INAMI Michitaka, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2011/05/25
2023 Free standing steel structures placed on base mortar and their seismic responses : Part2. Reduction experiment of friction coefficient of steel-mortar and reduction experiment of sliding displacement

INAMI Michitaka, ENOKIDA Ryuta, YAMAZAKI Tomoya, IKENAGA Masahiro, NAGAE Takuya, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2011/05/25
21022 Proposal on shaking table test technique to promote high frequency response : Part1. Concept of pounding shaking table test technique

ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, SHI Yundong, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010/07/20
21023 Proposal on shaking table test technique to promote high frequency response : Part2. Experimental validation

YAMAZAKI Tomoya, ENOKIDA Ryuta, NAGAE Takuya, SHI Yundong, KAJIWARA Koichi, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010/07/20
21024 Proposal on shaking table test technique to promote high frequency response : Part3. Comparisons with simulation and experimental results

SHI Yundong, ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2010/07/20
2018 Proposal of shaking table test technique to enhance the reproducible frequency ranges of tables : Part1. Proposal of pounding shaking table test technique

ENOKIDA Ryuta, KAJIWARA Koichi, NAGAE Takuya, SHI Yundong, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2010/05/25
2019 Proposal of shaking table test technique to enhance the reproducible frequency ranges of tables : Part2. Experimental validation of the shaking table test technique

SHI Yundong, ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, YAMAZAKI Tomoya, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2010/05/25
21303 Development of shaking table test techniques to reproduce seismic responses of high-rise buildings including higher modes

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, JI Xiaodong, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2009/07/20
2015 Shaking table test for reproduction of seismic responses of high-rise buildings including higher modes

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Koichi, JI Xiaodong, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2009/05/22
DEVELOPMENT OF SHAKING TABLE TEST TECHNIQUES TO REALIZE LARGE RESPONSES AND EVALUATION OF SAFETY OF A HIGH-RISE BUILDING

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Kouichi, JI Xiaodong, NAKASHIMA Masayoshi

Journal of structural and construction engineering　2009/03/30

More details Close

To examine the performance of furniture in the top stories of high-rise buildings particularly under long-period ground motions, a full-scale shaking table test was conducted in E-defense. A mass-and-rubber system was designed to overcome the limitation of the shaking table. A five-story specimen with large stiffness was set on the rubber-and-mass system. It enables that different stories' responses are same and a lot of furniture experiments are carried out simultaneously. The waves generated from the inverse dynamic compensation were taken as inputs. The test results show that the large responses at the top stories can be reproduced reasonably. Through the shaking table test, physical data of furniture in high-rise buildings under long-period ground motions were obtained.
DEVELOPMENT OF SHAKING TABLE TEST TECHNIQUES TO REALIZE LARGE RESPONSES AND EVALUATION OF SAFETY OF A HIGH-RISE BUILDING

ENOKIDA Ryuta, NAGAE Takuya, KAJIWARA Kouichi, JI Xiaodong, NAKASHIMA Masayoshi

Journal of Structural and Construction Engineering (Transactions of AIJ)　2009

More details Close

To examine the performance of furniture in the top stories of high-rise buildings particularly under long-period ground motions, a full-scale shaking table test was conducted in E-defense. A mass-and-rubber system was designed to overcome the limitation of the shaking table. A five-story specimen with large stiffness was set on the rubber-and-mass system. It enables that different stories' responses are same and a lot of furniture experiments are carried out simultaneously. The waves generated from the inverse dynamic compensation were taken as inputs. The test results show that the large responses at the top stories can be reproduced reasonably. Through the shaking table test, physical data of furniture in high-rise buildings under long-period ground motions were obtained.
21091 Full-Scale Substructure Shaking Table Tests to Reproduce Responses of High-Rise Buildings : Part 1. Control Algorithms for Substructure Shaking Table Tests

JI Xiaodong, ENOKIDA Ryuta, KAJIWARA Kouichi, NAGAE Takuya, NAKASHIMA Masayoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008/07/20
21093 Full-scale substructure shaking table tests to reproduce responses of high-rise buildings : Part 3 Shaking table tests considering nonlinearity of rubber bearings to reproduce responses of high-rise buildings

ENOKIDA Ryuta, JI Xiaodong, KAJIWARA Koichi, NAGAE Takuya, NAKASHIMA Masayashi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008/07/20
21092 Full-scale substructure shaking table tests to reproduce responses of high-rise buildings : Part 2 Development of techniques for shaking table test to realize large responses of high-rise buildings

NAKASHIMA Masayoshi, ENOKIDA Ryuta, JI Xiaodong, NAGAE Takuya, KAJIWARA Koichi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2008/07/20
22415 System Identification and Seismic Responses in Elastic Range : E-Defense Shaking Table Test for Evaluation of Seismic Performance of High-Rise Building Part. 4

Kajiwara Kouichi, Chung YuLin, Enokida Ryuta, Ji Xiaodong, Nagae Takuya, Fukuyama Kunio, Inoue Takahito, Nakashima Masayoshi, Hidaka Toko

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. C-1, Structures III, Timber structures steel structures steel reinforced concrete structures　2008/07/20
2003 Development of techniques for shaking table test to realize large responses of high-rise buildings

ENOKIDA Ryuta, JI Xiaodong, NAGAE Takuya, KAJIWARA Koichi, NAKASHIMA Masayoshi

日本建築学会近畿支部研究報告集. 構造系　2008/05/23
21187 Attenuation Relations for Random Ground Motion Model and Earthquake Input Energy Spectrum : Part1 Estimation of Attenuation Relations

TAKAMATSU Kengo, ENOKIDA Ryuta, MATSUDA Satoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2007/07/31
21188 Attenuation Relations for Random Ground Motion Model and Earthquake Input Energy Spectrum : Part2. Verification ofAttenuation Relations

ENOKIDA Ryuta, TAKAMATSU Kengo, MATSUDA Satoshi

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants　2007/07/31
2002 Attenuation relations for Random Ground Motion Model and Earthquake Input Energy Spectrum

ENOKIDA Ryuta, TAKAMATSU Kengo, MATSUDA Satoshi

日本建築学会近畿支部研究報告集. 構造系　2007/05/22

Show all Show first 5

Industrial Property Rights 1

振動台制御装置及び振動台制御方法

榎田竜太, 梶原浩一

特許7287660

Property Type: Patent

Holder: 国立研究開発法人防災科学技術研究所

Research Projects 19

Comprehensive seismic evaluation of free-standing structures for Japan and other high seismic-risk countries along with developments of innovative experimental techniques

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2024/04 - 2028/03
Distributed Real-Time Substructure Testing on Seismic-Resistant Structures using FEM and DSS Scheme

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for JSPS Fellows

Institution: Tohoku University

2024/11/15 - 2027/03/31
Practical Research on Fragility Updating by Hybrid Monitoring System

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Challenging Research (Pioneering)

Category: Challenging Research (Pioneering)

Institution: Tohoku University

2023/06 - 2026/03
The Second Japan-New Zealand Workshop On Structural Engineering

Offer Organization: The Obayashi Foundation

System: 2024 Fiscal Year Grant for International Conferences

Institution: International Research Institute of Disaster Science, Tohoku University

2025/09 - 2025/09
Robustness Enhancement of Vibration-Controlled Structures by Damping Capacity Design Method

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kobe University

2022/04/01 - 2025/03/31
Development and implementation of a sliding isolation system for earthquake resistant masonry constructions in developing countries

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Kansai University

2020/10/27 - 2025/03/31
Development of an input identification based on nonlinear control for seismic waves inducing critical responses, with its experimental validation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2022/06 - 2025/03
Development of a seismic response inverse method based on fish-bone model to estimate damage and physical parameters in buildings

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Research Institute for Earth Science and Disaster Prevention

2021/04 - 2025/03
Development of isolation technology for responses using variable inerter mass damper

Ikenaga Masahiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kansai University

2021/04 - 2024/03

More details Close

We developed a "variable-mass rotary inertia mass damper" (hereinafter denoted as "variable-inerter damper"), in which the added inerter changes according to the response, and clarified the performance of the developed damper through dynamic loading experiments and shake table experiments. We also proposed a simulation analysis method for the developed variable inerter damper, especially a numerical analysis method for when the inerter changes, and clarified the validity of the proposed method through its consistency with the experimental results. In addition, we clarify the design method of this damper and its advantages over other dampers when introducing a variable inerter damper into the seismic isolation layer of a base-isolated structure through time history response analysis. In particular, it was shown that during long-period, long-duration earthquakes, both the displacement of the seismic isolation layer and the response acceleration can be suppressed more than other dampers.
High-performance control of nonlinear shaking table tests performed for examinations of displacement suppression of seismic isolation buildings

Enokida Ryuta

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2020/04/01 - 2023/03/31

More details Close

This study addresses the issue of shake table control degradation caused by sliding of a system placed on the table, by applying Nonlinear Signal-Based Control (NSBC) to this issue. First, we have developed numerical simulation for shake table experiments based on NSBC for sliding structures and its stability analysis. Then, we have applied NSBC to actual shake table experiments with different sliding structures such as a rigid sliding mass and a free-standing structure. The control accuracies of NSBC were evaluated in the comparison with the conventional feedforward controller based on an inversed transfer function of the controlled system. In these experiments, NSBC achieved the expected experiments even with any of the sliding systems with accurate control of the shake table acceleration. The experimental examination clarified its superiority over the conventional method.
Active, semi-active structural control against large ground motion and non-linear real-time hybrid simulation Competitive

FUJITANI HIDEO

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kobe University

2018/04/01 - 2021/03/31

More details Close

Buildings are required to protect human lives, reduce damage and keep functions according to the use of the building. The occurrence of the long period ground motions and pulse ground motions is predicted. The important buildings have to keep function, even if those are excited by such ground motions. In this study, researches on the semi-active control of base-isolation system and the active control by large mass damper were conducted for the purpose mentioned above. In those researches, a new verification method of the real-time hybrid simulation using shaking-table and hydraulic actuator (we call this "Dual real-time hybrid simulation") was proposed and response compensation was developed. In conclusions, a semi-active control method for non-linear base-isolation system to reduce the floor acceleration unaffected by hardening of isolators and an active control method to reduce the response displacement were proposed.
Real-time substructuring experimentations for acceleration control of shake tables sustaining nonlinear specimens Competitive

ENOKIDA RYUTA

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

Category: Grant-in-Aid for Early-Career Scientists

Institution: National Research Institute for Earth Science and Disaster Prevention

2018/04/01 - 2020/03/31

More details Close

In the first year, we established a shake-table experimental scheme based on nonlinear signal-based control (NSBC), which is the key element for real-time substructuring shake-table experiments. In an experiment of a shaking table supporting a nonlinear specimen, NSBC successfully realized near 100% control accuracy of the table, while conventional control approaches failed to do so. <BR> In the second year, based on the above research results, we conducted real-time substructuring experiments using the shake-table having the nonlinear structure. The substructuring experiments were successfully executed by nonlinear substructuring control (NLSC), which had been also developed on the basis of NSBC.
Experimental study for MEMS sensor monitoring system to assess seismic response of Non-structural element of building Competitive

KAJIWARA KOICHI

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Research Institute for Earth Science and Disaster Prevention

2017/04/01 - 2020/03/31

More details Close

In order to maintain and continue normal living and economic activities in our society, preparing for the future large-scale earthquake event, it is necessary to judge the performance of the infrastructures after the earthquake as a matter of course to improve the earthquake resistance before the earthquake. For this reason, many investigations have been conducted on structural health monitoring. Here, we have researched a system that estimates the structural characteristics of a building after the earthquake by capturing the response of non-structural element installed in the building with MEMS(micro-electro-mechanical systems) sensor. In this research, we have finished the basic investigation for practical use.
免震建物の地震応答を評価するリアルタイムオンライン実験手法の開発 Competitive

榎田竜太

Offer Organization: 日本学術振興会

System: 海外特別研究員制度

2014/04 - 2016/03
Collaborative research with Kyoto University for applications of control theory to earthquake engineering Competitive

ENOKIDA RYUTA

Offer Organization: University of Bristol

System: Bristol-Kyoto Strategic Fund

2013/04 - 2015/03
Dynamic substructuring shake table experimentation for the evaluation of seismic performance of structures subjected to extreme loads Competitive

ENOKIDA RYUTA

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

Category: Grant-in-Aid for JSPS Fellows

Institution: Kyoto University

2012 - 2014/03
摩擦による損傷低減機能を有する直置き型鋼構造建物の開発 Competitive

榎田竜太

Offer Organization: (社)日本鉄鋼連盟

System: 鋼構造研究・教育助成事業

2011/04 - 2012/03
Development of a substructuturing shake table test method for advanced structural seismic testing Competitive

ENOKIDA RYUTA

Offer Organization: Japan Society for the Promotion of Science

System: Research Fellowship for Young Scientists DC2

Category: Development of a substructuturing shake table test method for advanced structural seismic testing

2010/04 - 2012/03
Development and performance assessment of damage-resistant steel buildings utilizing friction behaviors between column base and foundation

NAGAE Takuya, ENOKIDA Ryuta

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

Category: Grant-in-Aid for Young Scientists (A)

Institution: National Research Institute for Earth Science and Disaster Prevention

2009 - 2011

More details Close

A series of shaking table tests were conducted in order to develop the damage-resistant steel buildings whose column bases can slip when subjected to strong earthquake motions. First, the friction behaviors between conventional steel column and base mortar were estimated. Second, a cast-iron column was examined, and its low coefficient of friction was clarified. A column base supported by a graphite layer was also examined for a low coefficient of friction. Third, conditions of stopper to reduce the slip drift were verified. Finally, seismic performance of a prototype building was considered by the dynamic response analysis reflecting the test results, and a method to assess the seismic performance was studied for the proposed structural system.

Show all Show first 5