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Received: 27 March 2020 Accepted: 6 June 2020 Drawing on the theory of model similarity, the failure mode of a columnfree long-span subway station under asymmetric load was discussed under seismic waves, in the light of different frequency spectrum features, loading conditions, and ground motion intensities. Specifically, a largescale model was designed for the subway station, and subjected to shaking table tests. Based on the test data, the authors comparatively analyzed the seismic responses of the model under unidirectional and bidirectional earthquakes. The results show that: (1) The acceleration response of the model increased with the acceleration amplitude. The dynamic response of the model is more complex and greater under bidirectional earthquake than under unidirectional earthquake. (2) The middle plate is the weak link in seismic design, and should therefore be enhanced. (3) The acceleration response was larger when the model had an asymmetric slope, for the dynamic response is amplified by the asymmetric load. Hence, the asymmetric slope suppresses the seismic resistance of the model. (4) The strains of the model gradually increased with the growing amplitude of ground motion; The middle plate had a greater strain than other plates, indicating that this plate has relatively low stiffness, and deforms significantly under seismic action. (5) The earth pressure values under bidirectional seismic action were greater than the simple superposition between the values under horizontal seismic action and the vertical seismic action. The research results provide a good reference for the seismic design of underground structures.

Shaking Table Tests on the Seismic Response of a Columnless Subway Station with Asymmetric Load under Bidirectional Seismic Action