桩基桥墩的静力推倒分析

Analysis on Static Pushing Over of Pile Foundation Bridge Pier

该文根据日本铁道抗震设计规范建立了考虑桩构件及地基非线性的杆系有限元模型,分析了某客运专线上的桩基础的水平极限承载能力,并与我国规范m法的计算结果进行了比较。分析结果表明:当墩顶水平力较大时,随着桩侧地基土水平及竖向抗力不断进入塑性,中日两国规范计算的结果相差较大;考虑桩土相互作用的墩顶水平力-位移的骨架曲线可用三线性描述。该分析结果可为罕遇地震下桩基础的抗震分析提供理论依据。

Based on Japan Railway Anti-earthquake Design Criterion,the nonlinear bowstring finite element model considering the pile member and subgrade is set up.The article analyzes the horizontal utmost bearing capacity of the pile foundation in a special passenger transport line,and compares with the calculation result of m method in the Chinese criterion.The analyzing result makes clear that there is the greater difference between the calculation results by the criterions of China and Japan when the horizontal force at the top of pier is larger and with the soil horizontal and vertical resisting force of the subgrade at the side of pile to be continuously into plasticity.It is considered to use the trilinear description