Response Analysis of a Long-span Arch Bridge under the Seismic Travelling Wave Excitation

Abstract

Taking a long-span arch bridge as an example, the characteristics of dynamic responses of the arch bridge under the horizontal and vertical travelling seismic wave excitations and the effect of the wave travelling velocity on the responses are discussed based on numerical analysis results. According to the structure symmetry, a simplified computation method is proposed for the travelling seismic response analysis of the bridge in time domain by using the seismic response of two half arch bridges under the uniform excitation. The time history analysis results indicate that the simplified method can achieve a good precision. The comparison of the numerical results describes the phenomena that the seismic response under travelling wave excitation does not linearly change with the seismic wave velocity. Through some further analysis, this article proposes a new concept of the resonant under travelling wave excitation, and the mechanism of the resonant effect in travelling seismic wave excitation is being expatiated.