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以P-Y曲线法模拟液化土与桩基作用,通过ANSYS建立某钢管混凝土梁拱组合桥的三维有限元模型,对桩基础和刚性基础2种方案进行自振特性和地震响应对比分析,进而研究了不同地震动输入下土桩结构相互作用因素对大桥地震响应的影响,旨在为同类型桥梁的抗震设计提供参考。结果表明:液化场地下结构的动力特性不可直接用基础固结模型简化计算,上部结构地震响应受液化土-桩相互作用影响明显,液化场地下结构的地震响应,下部结构更为不利。
The PY curve method is used to simulate the interaction between liquefied soil and pile foundation. The three-dimensional finite element model of CFST arch bridge is established by ANSYS. Comparing and analyzing the natural vibration characteristics and the seismic response of two kinds of schemes of pile foundation and rigid foundation, The effect of soil-pile interaction on the seismic response of the bridge under different ground motion inputs is intended to provide reference for the seismic design of similar bridges. The results show that the dynamic characteristics of subsurface structure in liquefied ground can not be directly calculated by using the basic consolidation model. The seismic response of the superstructure is significantly affected by the interaction between liquefied soil and pile. The seismic response and substructure of the subsurface structure of the liquefied ground are more unfavorable.