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Dive into the research topics where Tomohiko Kumagai is active.

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Featured researches published by Tomohiko Kumagai.


Journal of Structural and Construction Engineering (transactions of Aij) | 2009

VIBRATION TESTS ON SEISMIC RESPONSES OF ARCH STRUCTURES SUPPORTED BY SUBSTRUCTURES WITH VARIOUS NATURAL PERIODS AND MASSES

Tomohiko Kumagai; Toru Takeuchi; Fumi Ushiwata; Hiroko Seta; Toshiyuki Ogawa

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Journal of Structural and Construction Engineering (transactions of Aij) | 2008

RESPONSE EVALUATION OF HIGH-RISE LATTICE DOMES WITH SUPPORTING SUBSTRUCTURES

Toru Takeuchi; Tomohiko Kumagai; Shunsuke Okayama; Toshiyuki Ogawa

Seismic response of raised domes with substructures are known to be very complicate, because of the roof having large numbers of parallel vibration modes, and their amplitude changing drastically along the relationship between domes and substructures. The authors have proposed simple method for estimating the response of such domes with amplification factors, however, they do not cover high-rise domes. In this paper, simple response evaluation method of lattice domes with high-rise proportions supported by various stiffness of substructures is proposed using continuous approach as the previous studies, and their validities are discussed against response spectrum analyses with CQC method.


Journal of Structural and Construction Engineering (transactions of Aij) | 2008

VIBRATION TESTS OF CYLINDRICAL LATTICE SHELL ROOFS SUBJECTED TO EARTHQUAKE MOTIONS WITH ARBITRARY DIRECTION

Tomohiko Kumagai; Toru Takeuchi; Izumi Suzuki; Toshiyuki Ogawa

Seismic response of cylindrical lattice shell roofs with supporting substructures is known to be amplified in vertical direction even under horizontal input, and their amplitude changes along the direction of earthquake motion. However, the seismic response behavior under the inputs in arbitrary direction has not been sufficiently investigated. In this paper, seismic vibration tests are carried out using small scale models with supporting substructure in order to make clear the effects of difference of input direction and relationship between mechanical properties of roofs and substructures on response behavior of shell roofs. It is confirmed that the simple response evaluation methods proposed in previous papers apply to the responses subjected to earthquake motions with arbitrary direction.


Journal of Structural and Construction Engineering (transactions of Aij) | 2004

RESPONSE EVALUATION OF MEDIUM-SPAN LATTICE DOMES WITH SUBSTRUCTURES USING RESPONSE SPECTRUM ANALYSIS

Toru Takeuchi; Toshiyuki Ogawa; Mika Nakagawa; Tomohiko Kumagai


Journal- International Association for Shell and Spatial Structures | 2003

Dynamic buckling behavior of single layer lattice domes subjected to horizontal step wave

Tomohiko Kumagai; Toshiyuki Ogawa


Journal- International Association for Shell and Spatial Structures | 2005

Shape optimization of shell roofs subjected to strong wind by using a variable complexity model

Toshiyuki Ogawa; Makoto Ohsaki; Tomoshi Miyamura; Tomohiko Kumagai


Symposium of the International Association for Shell and Spatial Structures (50th. 2009. Valencia). Evolution and Trends in Design, Analysis and Construction of Shell and Spatial Structures : Proceedings | 2009

Response Evaluation of Seismically Isolated Lattice Domes using Amplification Factors

Kengo Takamatsu; Toru Takeuchi; Tomohiko Kumagai; Toshiyuki Ogawa


Journal of Structural and Construction Engineering (transactions of Aij) | 2012

ADDED MASS ON VIBRATING MEMBRANE ROOFS

Toshiyuki Ogawa; Tomohiko Kumagai; Yuta Kurokawa; Koji Tabuchi; Masanao Nakayama; Keiji Masuda


Journal of Structural and Construction Engineering (transactions of Aij) | 2010

SEISMIC RETROFIT OF STEEL-STRUCTURE SCHOOL GYMNASIA WITH ENERGY DISSPATION DEVICES AND THEIR EFFECTS ON ROOF RESPONSE

Toru Takeuchi; Yuki Tsutsumi; Tomohiko Kumagai; Toshiyuki Ogawa


Symposium of the International Association for Shell and Spatial Structures (50th. 2009. Valencia). Evolution and Trends in Design, Analysis and Construction of Shell and Spatial Structures : Proceedings | 2009

State-of-Arts Views on Response Control Technologies on Metal Space Structures

Toru Takeuchi; Toshiyuki Ogawa; Tomohiko Kumagai

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Toshiyuki Ogawa

Tokyo Institute of Technology

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Toru Takeuchi

Tokyo Institute of Technology

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Ken'ichi Minowa

Nippon Institute of Technology

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Ryota Matsui

Tokyo Institute of Technology

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Yuki Terazawa

Tokyo Institute of Technology

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