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本文根据连续介质力学理论,考虑平面应变假设,按桩-土-桩动力相互作用概念,研究了群桩中每两根桩的关系,并利用等效单桩的原理,将群桩动力问题转化为等效单桩动力问题,使分析得到简化。分析中采用了传递矩阵的方法,可方便而有效地考虑土的分层。在水平摇摆振动的分析中,还考虑了桩的竖向运动对摇摆刚度的贡献。 根据本文的理论和方法,用自编专用程序SPGSIA分析了土-群桩系统的动力特性;并用动力子结构及快速富里叶变换技术分析了土-群柱-结构系统的相互作用地震反应。通过本文的研究,得到了一些规律性的结果。
In this paper, according to the continuum mechanics theory, considering the plane strain hypothesis, according to the concept of pile-soil-pile dynamic interaction, the relationship between every two piles in the pile group is studied, and the principle of the equivalent single pile is used to transform the group pile dynamic problem. For the equivalent single pile dynamic problem, the analysis is simplified. The method of transfer matrix is adopted in the analysis, and the layering of soil can be conveniently and effectively considered. In the analysis of the horizontal swaying vibration, the contribution of the vertical movement of the pile to the sway stiffness is also considered. According to the theories and methods in this paper, the dynamic characteristics of the soil-pile system are analyzed by SPGSIA, a special program, and the interaction seismic responses of the soil-group column-structure system are analyzed by the dynamic substructure and the fast Fourier transform technique. Through the study of this paper, some regular results have been obtained.