Kohji Koyamada
Kajima
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Publication
Featured researches published by Kohji Koyamada.
Workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground | 2005
Kohji Koyamada; Yuji Miyamoto; Kohji Tokimatsu
Konan junior high school in Hokkaido, the northernmost main island of Japan, suffered severe damage to its superstructure and pile foundations during the Tokachi-oki Earthquake (M=8.0), on September 26, 2003. The objective of this study is to verify the main factors causing this damage by field investigations and earthquake response analyses. Detailed field surveys were carried out on the superstructure and pile foundations immediately after the quake. Analyses of the structure of the pile foundation were conducted using a numerical model taking into account the effect of soil nonlinearity. Strong motions observed near the school were employed as the input motion to the analysis model. It is found that compression failures at the pile heads were caused not only by the inertial force from its superstructure but also by large displacement of a very soft clay, leading to differential settlement as well as shear cracks in walls of the superstructure.
Journal of Structural and Construction Engineering (transactions of Aij) | 2001
Kenji Miura; Kohji Koyamada; Masanori Iiba
Journal of Structural and Construction Engineering (transactions of Aij) | 2003
Yasutsugu Suzuki; Kohji Tokimatsu; Kohji Koyamada
Journal of Structural and Construction Engineering (transactions of Aij) | 2002
Hideaki Saito; Hideo Tanaka; Tomoaki Ishida; Kohji Koyamada; Osamu Kontani; Yuji Miyamoto
Journal of Structural and Construction Engineering (transactions of Aij) | 1999
Kohji Koyamada; Yuji Miyamoto; Yuji Sako; Mamoru Furue
Journal of Structural and Construction Engineering (transactions of Aij) | 1998
Masayuki Nagano; Susumu Ohno; Kohji Koyamada; Kenichi Kato
Journal of Structural and Construction Engineering (transactions of Aij) | 2000
Kenji Miura; Kohji Koyamada
Journal of Structural and Construction Engineering (transactions of Aij) | 1997
Yuji Miyamoto; Yuji Sako; Kohji Koyamada; Kenji Miura
Journal of Structural and Construction Engineering (transactions of Aij) | 2010
Katsuichirou Hijikata; Rikiro Kikuchi; Yasushi Nukui; Akira Imamura; Fumio Yagishita; Tatsuya Mase; Hiroyuki Yoshida; Tadahiko Shiomi; Kohji Koyamada; Kazuhiro Yoshida
Journal of Structural and Construction Engineering (transactions of Aij) | 2010
Masafumi Mori; Masanori Iiba; Koji Yamamoto; Yuji Miyamoto; Kohji Koyamada; Shin Koyama; Toshihide Kashima