Multi-index and thresholds for seismic performance evaluation of prefabricated subway station structure

The prefabricated subway station is composed of prefabricated components and cast-in-place concrete, there are many splicing nodes between its components, and these splicing nodes will directly affect the seismic performance of the structure. Based on static pushover tests of the prefabricated subway station, this paper establishes a three-dimensional finite element model, which is consistent with physical tests. The feasibility of the model is verified by analyzing and comparing the mechanical characteristics, damage details and failure modes of the structure, the Interstory Displacement Ratio (IDR) of the middle column and crack width are selected to evaluate the seismic performance of the structure. The results indicate that the numerical model is in good agreement with the force-displacement curve and damage details of physical test. The upper layer of the prefabricated subway station structure is more seriously damaged than the lower layer, the displacement between the upper layers is 1.6 times that of the lower layers and there are obvious cracks in the wall-middle slab joint. Finally, combined with the safety and normal use functionality of the prefabricated subway station, and taking the IDR and crack width at the joints of the prefabricate subway station into consideration, the index limits of the structure under different damage states are quantified, which provides a reference for the optimal design of its performance.