大跨度高墩连续刚构桥抗震设计研究

Research of Anti-seismic Design of Long-span Continuous Rigid Frame Bridge with High piers

以主跨168m的连续刚构桥为例,利用Midas/civil桥梁专用软件建立有限元模型,对其动力特性及罕遇地震下的非线性时程进行分析,进而研究在罕遇地震下结构是否满足规范要求及相应的延性设计。计算表明:该桥振型主要以墩梁的横向振动为主,第一阶纵漂的周期为1.954s,全桥最大振幅出现在墩顶位置。通过非线性时程分析,得到桥墩内力、位移等结果,进而判断是否有足够的延性抗震能力或进行优化设计。

Taking main span 168m of the continuous rigid frame bridge as an example, the finite element model was established based on Midas/civil bridge dedicated software, the research on its dynamic characteristics and the nonlinear time history analysis under severe earthquake, thus the structure under severe earthquake whether meet the specification requirements and the ductility of the corresponding design. The calculation shows that the vibration mode of the bridge is mainly the lateral vibration of the bridge pier, and the vibration mode of the first stage lateral bending is 1.954s, and the maximum amplitude of the bridge appears at the top of the pier. Bridge pier is obtained by nonlinear time history analysis and gets internal force and displacement. Whether there is enough ductility aseismic ability or optimization design.