【摘要】 本文使用7S-Ⅱ计算机程序,在两个不同大小的地震力作用下,对具有埋入基础的土-结构系统进行了地震响应分析。分析中不但考虑了地基土的材料非线性,而且考虑了接触界面的非线性。为了估计这些非线性性能对结构和土的响应值影响的大小,文中定义了非线性时间比,β_J和β_J。接触界面的动力性能在文中也得到了详细的讨论。在中等地震的作用下,界面上的滑移和剥离对其邻近区域的响应值就有了很大的影响。随着激震力的增大,结构物基础的侧面和地基土会完全剥离,使得系统的基频发生漂移,从而引起结构物顶端的线性和非线性结构内部反应谱之间在共振频率区段内有明显的差别。更多还原

【Abstract】 In this paper a partially embedded structure with interacting soil is analysed under two different levels of excitations by using the program 7S-II, including not only non-linearity of interface, but also material non-linearity of soil. For assessment of contribution of the non-linear behavior to the responses of system, non-linear time ratios, β, and βJ are defined. The dynamic behavior of the interface is also discussed. The separation and sliding on the interface affect greatly the respnoses in the region contiguous to the contact surface, even if the system is excited moderately. As the excitation being stronger, the side wall of foundation loses completely contact with the soil, resulting in shifting of the fundamental period of the system and large differences between linear and nonlinear analyses in the resonant frequency range of instructure response spectrum for the top point of the structure.更多还原