At present, the seismic structure of recoverable functional bridges based on seismic resilience is one of the hotspots in bridge seismic engineering research. Therefore, a new type of hybrid piers is designed in this paper, which mainly relies on replaceable components to achieve repairable structural performance after earthquakes. At the same time, four-level seismic fortification objectives based on seismic resilience is proposed, and the follow-up stiffness phenomenon is found on this basis. The finite element software OPENSEES was used to perform IDA analysis on a hybrid pier and an ordinary reinforced concrete (RC) pier. The fragility curves and seismic resilience curves of two piers were compared, and the seismic resilience performance and the follow-up stiffness phenomenon of the hybrid pier were studied. The results show that under the action of different seismic waves, the top displacement angle of the pier of the hybrid pier is slightly larger than that of the ordinary RC pier, but the overall difference is not large. The fragility curve of the hybrid pier is slightly larger than that of the ordinary RC pier. However, with the damage to the hybrid pier, the follow-up stiffness phenomenon impacts the seismic performance, which reduces the seismic force acting on the structure and improves the seismic resilience of the structure. The post-earthquake recovery time of two piers under different damage states was determined. Combined with the fragility curves, the seismic resilience curves of two piers were presented. The resilient index of the hybrid pier was always maintained at 0.9–1, and the seismic resilience performance was excellent.

目前，基于抗震回弹力的可恢复功能桥梁抗震结构是桥梁抗震工程研究的热点之一。因此，本文设计了一种新型混合桥墩，主要依靠可更换构件实现震后可修复的结构性能。同时提出了基于抗震回弹力的四级抗震设防目标，并在此基础上发现了随动刚度现象。采用有限元软件OPENSEES对混合桥墩和普通钢筋混凝土桥墩进行IDA分析。对比了两种桥墩的易损性曲线和回弹曲线，研究了混合桥墩的回弹性能和随动刚度现象。结果表明，在不同地震波作用下，混合桥墩的桥墩顶部位移角略大于普通RC桥墩，但总体差异不大。混合桥墩的脆性曲线略大于普通钢筋混凝土桥墩。然而，随着混合墩的损坏，后续刚度现象影响抗震性能，从而减小了作用在结构上的地震力，提高了结构的抗震能力。确定了不同损伤状态下两个桥墩的震后恢复时间。结合易损性曲线，给出了两个桥墩的抗震回弹曲线。混合桥墩的回弹指数始终保持在0.9~1，抗震性能优良。