Abstract
An increasing number of combined highway and railway sea-crossing bridges are under construction, while their train-bridge coupling system responses under combined wave and seismic action are rarely investigated. This study first established a validated numerical wave flume to calculate the wave action applied to the train-bridge coupling system. Three seismic acceleration time histories, obtained from the Pacific Earthquake Engineering Research Center (PEER) ground motion database, were adopted after normalization treatment. The earthquake hydrodynamic force and pile-soil interaction were also considered in the present study. A comparative analysis under different load combinations was conducted to investigate the influence of different load combinations on the bridge and train responses. This study also analyzed the changing patterns of train and bridge responses with varying train velocities as well as the impact of the occurrence time difference between wave and seismic action. The results show that the seismic action plays a dominant role in the system responses, whose amplitudes are greatly influenced by the energy amplitudes and predominant frequencies of the seismic action. For train-bridge coupling system safety, the wheel unloading rate is recommended as the control evaluation index. Furthermore, the occurrence time difference resulting in the most unfavorable responses should be considered.
Published Version
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