液化场地桥梁足尺桩抗震简化分析方法

Simplified Seismic Analysis Method for Bridge Full-scale Piles in Liquefied Ground

摘要:

采用国际VELACS项目中离心机试验标定的内华达砂的动力计算参数,建立液化场地足尺桩-土动力相互作用分析的三维有限元模型;获得不同幅值的正弦波作用下桩-土动力相互作用的p-y曲线,修正并发展一种可用于液化场地桩-土动力相互作用分析的宏单元模型,并基于非线性文克尔地基梁模型建立桥梁足尺桩抗震分析的数值模型与简化方法,通过有限元分析结果验证该简化方法的正确性。

Abstract:

Most research in the seismic analysis of pile foundations in liquefied ground is based on small-scale model testing and theoretical analysis. This paper presents the development of a three-dimensional finite element model for dynamic pile-soil interaction using the dynamic calculation parameters of Nevada sand calibrated by conducting the centrifuge test outlined in the Verification of Liquefaction Analysis by Centrifuge Studies(VELACS) project.On the basis of this numerical model, the dynamic p-y curves under various shaking amplitudes are studied, and a macro-element model for analysis of dynamic pile-soil interaction in liquefied ground is developed. In addition, a simplified method for seismic analysis of the piles on the basis of the Winkler model is presented and verified by the results of numerical simulation.