Tsutomu Sawada
University of Tokushima
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Publication
Featured researches published by Tsutomu Sawada.
Soil Dynamics and Earthquake Engineering | 2003
A. Mikami; Tsutomu Sawada; T. Ekawa
Abstract An extended Kalman filter algorithm with local iteration is presented for the identification of non-linear and non-stationary soil properties. Borehole-array strong motions were recorded at a liquefied site during the 1995 Hyogoken-nanbu earthquake. In this study, a modified Kalman filtering method in which the extended Kalman filter is iteratively used at every local time-step to track rapid parameter changes is proposed. The method is then applied to the instrumented soil layer, which is modeled by an equivalent linear model. An identification of non-linear and non-stationary soil properties was conducted successfully; and non-linear restoring force–displacement relationships including progression with time were obtained.
Earthquake Engineering & Structural Dynamics | 1995
Q. Zhao; Tsutomu Sawada; Kiyoshi Hirao; Yoshifumi Nariyuki
Doboku Gakkai Ronbunshu | 1986
Tsutomu Sawada; Masahiro Nagae; Kiyoshi Hirao
Doboku Gakkai Ronbunshu | 1992
Tsutomu Sawada; Osamu Tsujihara; Kiyoshi Hirao; Hidefumi Yamamoto
Soil Dynamics and Earthquake Engineering | 2005
A. Mikami; Tsutomu Sawada
Computing in Civil Engineering | 2005
Osamu Tsujihara; Kazuhiro Terada; Tsutomu Sawada
Computing in Civil Engineering | 2003
Osamu Tsujihara; Yu-ki Fushimi; Takayoshi Kubori; Tsutomu Sawada
Doboku Gakkai Ronbunshu | 2001
Tsutomu Sawada; Kiyoshi Hirao; Osamu Tsujthara; Atsushi Mikami
Doboku Gakkai Ronbunshu | 2003
Osamu Tsujihara; Tsutomu Sawada
Journal of Applied Mechanics | 1998
Tsutomu Sawada; Daisuke Harai; Kiyoshi Hirao; Yoshifumi Nariyuki; Osamu Tsujihara
