Author:

Keywords:

Science & Technology, Technology, Engineering, Civil, Engineering, Mechanical, Engineering, train-bridge system, seismic analysis, topographic effect, viscous-spring artificial boundary, incident angle, azimuth, WAVE-PROPAGATION, DYNAMIC-ANALYSIS, GROUND-MOTION, EARTHQUAKE, SITE, SOIL, 0905 Civil Engineering, 0913 Mechanical Engineering, Civil Engineering, 4005 Civil engineering, 4016 Materials engineering, 4017 Mechanical engineering

Abstract:

Copyright © 2019 Techno-Press, Ltd. The local topography has a significant effect on the characteristics of seismic ground motion. This paper investigates the influence of topographic effects on the seismic response of a train-bridge system. A 3-D finite element model with local absorbing boundary conditions is established for the local site. The time histories of seismic ground motion are converted into equivalent loads on the artificial boundary, to obtain the seismic input at the bridge supports. The analysis of the train-bridge system subjected to multi-support seismic excitations is performed, by applying the displacement time histories of the seismic ground motion to the bridge supports. In a case study considering a bridge with a span of 466 m crossing a valley, the seismic response of the train-bridge system is analyzed. The results show that the local topography and the incident angle of seismic waves have a significant effect on the seismic response of the train-bridge system. Leaving these effects out of consideration may lead to unsafe analysis results.