Two-dimensional seismic simulation based on spectral element method and its application in high-speed railway track-bridge system

Abstract

Seismic investigations of engineering structures under near-field ground motions typically utilize probabilistic earthquake methods. This study introduces a two-dimensional profile model developed for the spectral element method, taking the Chi-Chi earthquake as an exemplar. By integrating source parameters and station information, we use the SPECFEM2D code for seismic simulations. To demonstrate our method's practicality, we compare the PGA and spectrum of our simulated ground motions with actual seismic records. Further, we calculate the seismic response of the high-speed railway track and bridge system (HSRTBS) under two seismic excitations, assessing peak response errors across the track system, girder, support, and pier. The case study verifies that the simulated ground motions in this paper can be used in the seismic analysis of HSRTBS, providing seismic excitation for the seismic design of the structure and effectively complementing the scenario with limited seismic records. Moreover, the seismic simulation method used in this paper can reduce the number of elements and improve computational efficiency.