Abstract
Most subway stations in China have been constructed recently and their seismic performance and potential failure modes are not well characterized. This paper is dedicated to identifying potential failure modes of underground frame structures through numerical simulations, and developing an optimized method for upgrading the seismic performance of deficient structures via controlling the potential failure modes. The dynamic response of an unequal-span subway station structure was calculated considering different ground motions with increasing peak horizontal acceleration, and the structural seismic performance characteristics were evaluated. Seismic performance evaluation indexes, including interlaminar deformation risk factor of columns and sidewalls and deflection risk factor of slabs, were established to identify the most critical structural component under strong earthquake excitations. The structure failure mechanism was analyzed, and consequently, the corresponding retrofitting scheme for upgrading its seismic performance was proposed. Finally, the structural responses before and after retrofit were calculated and compared to demonstrate the effectiveness of the retrofitting scheme. The results can improve the understanding of the failure modes of underground frame structures and provide references for their seismic design.
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