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Sliding seismic isolation performance of near-fault girder bridges equipped with laminated-rubber bearings
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DOI：10.1016/j.istruc.2026.112404.png)
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Abstract
En 中文
In this study, a sliding seismic isolation design (SSID) using laminated-rubber bearings (LRBs) was proposed to improve the seismic resilience of near-fault small-to-medium-span girder bridge (NSGBs) under strong earthquakes. The design integrates the slip at the bearing-girder interface (BGI) with the fuse-like mechanism of the seismic restraint block (SRB). Performance targets for key components across various seismic intensities were defined through shaking table tests. Incremental dynamic analyses were conducted on a typical NSGB using a nonlinear finite element model. The study evaluated the seismic performance of LRBs, SRBs, and piers. It also revealed the synergistic seismic isolation mechanism associated with the BGI slip and fuse-like mechanism of SRBs. A comparative analysis with a conventional seismic isolation and damping design (CSIDD) validated the superior performance of the SSID under pulse-type ground motion. The results indicated that the SSID facilitated sufficient BGI slip and controlled SRB failure under high-intensity earthquakes by regulating sliding displacements and SRB strengths. It ensured that the piers remained effectively elastic. The collision between the girder and SRBs following the bearing sliding significantly increased the seismic demand on the piers by approximately 45–64%. When the collision force exceeded the design threshold, SRB failure reduced the seismic demand by approximately 12–28%. SSID reduced the bending moment in piers by approximately 20% compared with CSIDD. It also restricted the pier-girder relative displacement within allowable limits and notably improved the overall seismic performance of the structure. The research findings provide new technical insights and a theoretical foundation for the seismic design of NSGBs and hold significant engineering application value.
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