Study on Seismic Dynamic Response of ShallowBuried Subway Station Structure and Ancillary Facilities

Strong earthquakes can cause damages to structural members and also yield nonnegligible damages to nonstructural facilities, the latter being closely related to earthquakeinduced inertial forces. At present, the acceleration response regularity of shallowburied subway station structure is not very clear. Using the finiteelement software ABAQUS, a dynamic soilstructure interaction model for a twostory subway station structure is established. The distribution of the peak acceleration response of the structure is obtained, and the damage assessment of nonstructural facilities is carried out based on the structural acceleration response. The results demonstrate that, in general, the peak acceleration responses of the subway station structure increase from lower to upper story levels, while the peak acceleration responses at the same height are practically equal. Moreover, the peak accelerations of a shallowburied subway station structure are generally less than or close to the peak ground acceleration. Furthermore, the nonstructural facilities are slightly damaged when subjected to a peak bedrock input acceleration of 0.1 g, and moderately damaged under a peak bedrock input acceleration in the range 0.2 – 0.6 g. Based on the acceleration response characteristics, it is proposed that the peak surface acceleration can be used as an index to evaluate the damage of nonstructural facilities in shallowburied subway station structure, which is simple, practical and basically meets the precision requirements.