To evaluate the seismic resilience of a high-speed railway track-bridge system equipped with SMA disc spring groups, an 8-span simply-supported girder bridge with an equivalent subgrade section was taken as the research object. SMA disc spring groups were arranged on both the side of the movable bearings and the fixed bearings. A finite element analysis model of the structure was established using OpenSees. Thirty ground motion records suitable for site class Ⅱ were selected from the database of the pacific earthquake engineering research center. A study on the seismic response of the track-bridge system was conducted both before and after the installation of the SMA disc spring groups. Based on the incremental dynamic analysis method, the seismic fragility analysis of the high-speed railway track-bridge system equipped with SMA disc spring groups was conducted. The results indicated that the SMA disc spring groups provided limited control over the displacement response of various components within the track system, but they significantly reduced the maximum and residual displacements of the shear slots and fixed bearings, while also decreasing the residual displacement of the piers. Under "V-shaped" terrain conditions, the installation of SMA disc spring groups was only sensitive to the displacement response of the movable bearings, fixed bearings, shear slots, and shear rebars. When the bridge piers were arranged with varying heights, the SMA disc spring groups exhibited poor control over the maximum displacement response of the shear slots. The installation of SMA disc spring groups could reduce the damage probability of the shear slots, particularly lowering the exceedance probability of the fixed bearings under different damage states.
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