Dynamic response of vehicle-track-bridge system under excitation from physics-based ground motion simulation

doi:10.16265/j.cnki.issn1003-3033.2022.06.1695

Abstract

Abstract:

In order to investigate the seismic response characteristics of the vehicle-rail-bridge system of a high-speed railway bridge near-fault area, taking a proposed long-span high-speed railway bridge as an example, the strong ground motion field caused by active fault around the bridge site was simulated by using the method of integration of source, propagation path and site condition. The vehicle-track-bridge system's dynamic responses under the simulated ground motion were analyzed and compared with those under observed ground motion. The results show that: a strong ground motion simulation method, integrating source, propagation path and site condition, can simulate the amplitude and waveform characteristics of ground motion at the station. In particular, the long-period pulse component is reflected in the velocity time history, and the spatial difference of ground motion near-fault area is reflected. Compared with the observed ground motion, the simulated ground motion has a greater impact on the displacement difference and acceleration of each component of the system. The transverse acceleration of the vehicle body is more sensitive to the ground motion input.

Key words: high-speed railway, ground motion simulation, vehicle-track-bridge, near-fault, spatial difference

XU Qianqi, CAO Yijie, SUN Xiaodan, LIU Yu, WANG Jichen, XIAO Chang. Dynamic response of vehicle-track-bridge system under excitation from physics-based ground motion simulation[J]. China Safety Science Journal, 2022, 32(6): 207-214.

Figures/Tables 10

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