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针对竖向传播的SV波作用下刚性桩复合地基的动力反应,在振型分解反应谱法的理论基础上,提出一种基于有限元分析的拟静力方法。该方法通过等效线性方法考虑土体的非线性,将上部结构惯性力和自由场变形对桩身内力的影响分开来考虑,其中前者采用类似振型叠加反应谱法的方法进行分析,后者采用一种针对地下结构的改进的有限元反应位移法进行分析。与动力时程分析的结果对比表明,所建议的计算方法能够较准确地求得水平地震作用下桩身内力峰值及其分布,显著提高了分析的效率。
Aiming at the dynamic response of the rigid pile composite foundation under the action of vertical SV waves, a quasi-static method based on finite element analysis is proposed based on the theory of mode decomposition reaction spectrum. This method considers the nonlinearity of soil by equivalent linear method and considers separately the influence of inertial force and free-field deformation of superstructure on the internal force of pile. The former is analyzed by the method of modal summation response spectrum method, the latter An improved Finite Element Response Displacement Method for underground structures was used. Compared with the result of dynamic time history analysis, the proposed method can obtain the peak value and its distribution of pile internal force under horizontal earthquake and improve the efficiency of the analysis remarkably.