Analysis of traveling wave effect on the seismic response of the spatial cable surface suspension bridge

Abstract

This study aims to explore the influence of the traveling wave effect on the dynamic characteristics of the spatial cable surface suspension bridge with a single main cable form. Under the background of Xia Sha pedestrian landscape flyover in Jiangmen City, finite element modeling of the spatial rope deck suspension bridge was performed using Midas Civil 2020 software. The effect of the traveling wave effect on the seismic response of the spatial rope deck suspension bridge was investigated through time course analysis. In order to make the results more generally applicable, seven groups of apparent wave velocities from 500 m/s to 6000 m/s were selected for comparative analysis with the calculated results of consistent excitation. The following conclusions were finally drawn: When the apparent wave speed is greater than a certain value, the calculation results of the shear force at the bottom of the tower and the displacement at the top of the tower both gradually converge to the uniform excitation with the traveling wave effect considered. The bending moment response values at the base of the tower and the spanwise displacement response values of the main beam when the traveling wave effect is considered are significantly different from the calculated results of the consistent excitation. It is necessary to consider traveling wave effects in the seismic design of the spatial cable surface suspension bridge.