The Behaviour Of Akashi Kaikyo Bridge Under
Multi Support Seismic Excitation For Low
Frequency Motions
Author(s)
L. Bahbouh, H. Yamada, H. Katsuchi, E. Sasaki & C. Theeraphong
Abstract
The purpose of this study is to investigate the behaviour of Akashi Kaikyo
Bridge under low frequency multi support seismic excitations which will amplify
the bridge response owing to the resonance phenomena impact. Nonlinear static
and modal dynamic analyses for seismic waves of different propagation
velocities are conducted. It is observed that the propagation wave velocities have
a significant effect on the bridge, and the bridge response to different
asynchronous input motions at the towers and abutments bases consists of the
dynamic component induced by the inertia forces, and the pseudo static
component results from the difference between the adjacent supports
displacements. For low travelling wave velocities, the response which varies
with the velocity is increased due to the pseudo static component. But as the
travelling wave velocity grows, the dynamic component increase to be
preeminent for infinite propagation velocities. These results are pronounced
largely when the travelling seismic waves have dominant low frequencies might
coincide some of the bridge frequencies even for high vibrating modes.
Therefore, it is required to investigate the response of long span suspension
bridges under low frequency travelling seismic excitations.
Keywords: Akashi Kaikyo Bridge, low frequency multi support excitation.
1 Introduction
Long span structures such as suspension and cable stayed bridges can be
subjected to different ground motions along their length due to the spatial
variability of the seismic excitation. The spatial variation of seismic motion has
been of concern for a number of decades, and it was considered as the result of
Keywords
Akashi Kaikyo Bridge, low frequency multi support excitation.
Related Book
Other papers in this volume
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