格构式高墩连续梁桥设计参数抗震适用性研究

Study on seismic applicability of design parameters of laced high-pier continuous-beam bridge

以(雅西高速)干海子特大桥为工程背景,采用迈达斯(Midas Civil2017版)有限元软件建立模型,选取墩刚度比、轴压比、柱肢截面含钢率、减隔震装置等作为关键的结构设计参数,研究E2地震作用下钢管混凝土格构式高墩桁梁桥弹塑性抗震性能和抗震适用性对全桥进行优化设计。结果表明,优化后的实桥模型可以大幅度降低地震响应,改善桁梁桥结构内力分布,提高结构安全可靠度,研究结果可为该类桥梁抗震设计提供技术支持,同时为钢管混凝土结构抗震规程进一步完善提供借鉴。

The model of Ganhaizi Bridge (Yaxi Expressway) was established by using Midas (Midas Civil2017 version) finite element software. In this paper, the stiffness ratio of pier, axial compression ratio and steel content of column and limb section are selected. As the key structural design parameters. The elastic-plastic seismic performance and seismic applicability of concrete-filled steel tubular lattice truss bridge under E2 earthquake were studied to optimize the design of the whole bridge. Results show that the optimized real bridge model can greatly reduce the seismic response, improve the internal force distribution of truss bridge structure and improve the structural safety and reliability. The research results can provide technical support for the seismic design of this kind of bridge. At the same time, it provides a reference for the further improvement of seismic code of concrete- filled steel tubular structures.