预制节段拼装桥墩受力性能分析与模拟

Analysis and Simulation of Mechanical Performance of Precast Segmental Assembly Piers

预制节段桥墩通过预应力筋施加的后张预应力获得自复位能力,通过耗能钢筋增加桥墩的耗能能力,在水平荷载作用下,桥墩各节段在接缝处会张开、闭合,具有摇摆及自复位结构的特点。根据现有的研究结果,结构的摇摆在其工作过程中可以有效降低地震作用,进而减小设计时结构的延性需求。在地震作用下,可以减小破坏,节约造价。本文参考国内外相关规范和已有研究成果,划分了预制节段桥墩的性能状态,提出了预制节段桥墩截面设计方法。为了具体说明设计步骤,对算例桥墩进行了设计。最后,利用有限元分析软件ADINA建立了实体模型,进行验证。研究表明:该设计方法简明合理,验证结果与预期相近,可以为以后此类桥墩的设计提供参考。

The precast segmental piers obtained the re-centering ability through the post tensioned prestress applied by the prestressed reinforcement,and increased the energy consumption capacity of the pier through the energy dissipation steel bars.Under the action of horizontal load,each section of pier would open and close at the joints,which had the characteristics of swing and re-centering structure.According to the existing research results,the seismic action of the structure could be effectively reduced during the swing process,and the ductility requirement of the structure in design could be reduced.The final performance was to reduce the seismic damage of the structure and save the cost.Referring to the relevant domestic and foreign codes and the existing research results,the performance state of precast segmental piers was divided,and the design method of precast segmental pier section was proposed.Then,an example bridge pier was given to illustrate the specific design steps.Finally,the solid model was established by using the finite element analysis software ADINA to verify.The research shows that the proposed design method is simple and reasonable,and the verification results are similar to the expected ones,which can provide reference for the design of such piers in the future.