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Seismic spatial effects on long-span bridge response
nonstationary inhomogeneous random fields

Lin Jiahao (林家浩)1, Zhang Yahui (张亚辉)2 and Zhao Yan (赵岩)1,2

1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China
2. Chongqing Communications Research & Design Institute, Chongqing 400067, China

Abstract: The long-span bridge response to nonstationary multiple seismic random excitations is investigated using the PEM (pseudo excitation method). This method transforms the nonstationary random response analysis into ordinary direct dynamic analysis, and therefore, the analysis can be solved conveniently using the Newmark, Wilson-� schemes or the precise integration method. Numerical results of the seismic response for an actual long-span bridge using the proposed PEM are given and compared with the results based on the conventional stationary analysis. From the numerical comparisons, it was found that both the seismic spatial effect and the nonstationary effect are quite important, and that both stationary and nonstationary seismic analysis should pay special attention to the wave passage effect.

Keywords: earthquake; nonstationary; random vibration; multiple excitation; long-span bridge