基于地基土线性假定的单桩P-△效应分析研究较多,但基于地基土非线性假定的单桩P-△效应分析研究极少.为此,提出等效多段折线弹簧模拟非线性地基土的p-y曲线,应用有限元法进行非线性地基土中单桩P-△效应分析.同时对等效多段折线弹簧模拟非线性地基土p-y曲线的具体细节进行了总结,以确保计算精度.最后,应用Midas Civil程序建立了有限元模型进行了算例分析.结果表明,等效多段折线弹簧模拟p-y曲线后应用商业程序计算基桩P-△效应是非常便捷的方法,具有工程实际意义.%Abstract: Many methods have been developed and applied to analysis of P-△ effect of piles in soils with linear property, while few have been developed and applied to analysis of P-△ effect of piles in soils with nonlinear property. Therefore equivalent springs are applied to simulate p-y figure of nonlinear clay, and then the P-△ effect of pile is analyzed by finite element method. The steps of how to simulate p-y figure of nonlinear clay is presented in the paper. Case analysis is done for displacement and stress calculation of pile in nonlinear clay with P-△ effect well considered by finite element method. Finally conclusions are drawn as follows: ( i) finite element method can well done in software, and is proved to be a effective method for P-△ effect analysis of pile foundation in nonlinear clay; (ii) finite element method will be popularized in engineering for analysis of P-△ effect analysis of pile foundation in nonlinear clay.
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