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  Study on the Working Mechanism of Prefabricated Subway Station Structure under Earthquake

  Based on the engineering background of a single-arch large-span prefabricated subway station in Changchun, a three-dimensional numerical model of the fabricated structure and cast-in-place structure considering soil-structure interaction was established. The seismic time history analysis showed that the fabricated structure had excellent resistance to deformation and better mechanical properties than cast-in-place structure, the influence of the cast-in-place structure on the surrounding soil was larger than that of the fabricated structure, but the maximum plastic strain amplitude of the soil was smaller than that of the fabricated structure. The prefabricated subway station structure has excellent seismic performance. From the four aspects of design concept, triangular self-stability, special structure and enclosure structure, the synergistic working mechanism of assembly structure was summarized, the ability of prefabricated structure to absorb seismic energy was better than that of cast-in-place structure, from the perspective of mechanical energy conversion and seismic energy transfer, the mechanism of energy dissipation and shock absorption of fabricated structure was explored. The working mechanism of the prefabricated subway station structure under earthquake was revealed by the synergy work and the energy dissipation function.

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