地基水平运动时高桥墩的动力屈曲仿真分析

摘要

将高桥墩简化为一端固支一端简支的受压杆,考虑大变形和混凝土的特殊本构关系,通过仿真分析得到在不同强度地震波下高桥墩从产生横向小幅振动到大幅振动直至失稳的全过程;得到了地震波冲击时高桥墩失稳的临界地震加速度和失稳时刻.通过算例的数值仿真分析比较了地震波幅值以及桥面质量大小对位移幅值响应曲线、临界地震加速度和失稳时刻的影响.所得结论对高桥墩的设计具有重要的指导意义.%Basic on compression bar model of a high pier with one end fixed and the other simple supported,considering the influence of large displacement and especial constitutive relation of concrete,the overall process from the transverse vibration to the instability of the high pier under the foundation horizontal motion by earthquake are obtained.The critical seismic acceleration and the instability time are given.The influence of the different seismic peak,the weight of the bridge on the displacement response,the critical seismic acceleration and the instability time are analyzed.The conclusion is of great significance for the design of high pier.