Study On The Seismic Retrofit Of A Steel Cable-stayed Bridge
Author(s)
H. Otsuka, K. Yamahira, H. Kusuda
Abstract
Study on the seismic retrofit of a steel
cable-stayed bridge
H. Otsuka', K. Yamahira' & H. Kusuda'
* Department of Civil Engineering, Kyushu University, Japan
*Sumitomo Heavy Industries Ltd., Japan
Abstract
This paper shows the effectiveness of a seismic isolator for the retrofit of a
steel cable-stayed bridge that has girder movement exceeding the yield
strength and bearing supports on which the reaction forces exceed the
designed axial forces. It is clarified by numerical calculations which show
that suitable locations and vertical stiffness of isolators can reduce the
response of internal forces and increase structural safety in the event of a
large earthquake.
1 Introduction
After the 1995 Great Hanshin-Awaji Earthquake, seismic loads were
increased drastically in Japan; for example from 0.7 to 2.0 in maximum
acceleration response spectra on stiff ground for highway bridges. Also,
highway bridges such as cable-stay bridges, whose dynamic behaviour is
complicated during
Keywords
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