偏心作用下预制拼装桥墩-盖梁体系抗震性能研究

Study on Seismic Performance of Precast Bridge Capping Beam-pier System under Eccentric Action

目的 研究不同盖梁节段和盖梁-桥墩连接方式对预制拼装双柱墩偏心作用下的抗震性能的影响。方法 采用有限元软件ABAQUS建立7组预制拼装双柱墩,对其进行偏心作用下拟静力模拟研究,改变桥墩的盖梁节段连接和盖梁-桥墩连接方式,对比分析拼装桥墩和现浇桥墩的滞回曲线、骨架曲线、破坏形态、耗能性能和延性,研究不同盖梁节段连接和盖梁-桥墩连接方式的桥墩抗震性能。结果 盖梁节段键齿连接桥墩,采用灌浆套筒和预应力连接的承载能力与现浇桥墩相比均有小幅度提高,提高幅度在10%以内,抗震性能参数几乎一致。结论 盖梁斜键齿连接,盖梁-桥墩灌浆套筒和盖梁-桥墩预应力连接的预制拼装桥墩与现浇桥墩性能基本一致,同样具有良好抗震性能和整体性,满足抗震要求。

In order to study the seismic performance of precast double column piers with different capping beam segments and capping beam-pier connection methods under eccentric loading,seven groups of precast double column pier models were established by using finite element software ABAQUS to carry out quasi-static simulation analysis under eccentric loading.Withing changing the capping beam segments and capping beam-pier connection methods,the hysteresis curve,skeleton curve,failure mode,energy dissipation performance,ductility,etc.,and the seismic performance of double column piers was studied.The results show that The results show that the load performance of the bridge piers connected by grouted sleeves and pre-stressed connections in the capping beam segment is slightly improved compared to cast-in-place bridge piers,with an improvement range of less than 10%,and the seismic performance parameters are almost the same.With connected by inclined key teeth of the capping beam,grouting sleeve and prestressed connection of the capping beam-pier have basically the same performance as the cast-in-place bridge piers,and also have good seismic performance and integrity,meeting seismic requirements.