【摘要】 对基岩地震动输入的适用性和SSI计算模型的合理性进行研究。首先,借鉴已有基岩地震谱表达式,采用数值方法修正高频段过滤函数,得到适用于我国目标场地的基岩地震谱;然后,分析当前位移输入的SSI计算模型,指出所存在的因单元尺寸划分逐步精细而导致的不收敛问题,推广无质量刚性元(massless rigid element,MRE)法解决这一问题,并给出MRE、结构系统和黏弹性人工边界三者间连接示意图;最后,基于上述工作和随机振动理论生成基岩地震动位移输入谱,对一算例进行分析,结果表明采用MRE法解决SSI计算模型的可行性。研究工作可为土–结构共同作用相关问题的研究提供参考。更多还原

【Abstract】 The applicability of spectra of bedrock earthquake motion and rationality of calculation model considering soil-structure interaction(SSI) for structural seismic response analysis are studied.Firstly,in order to obtain the spectra of bedrock earthquake motion in China,not only the expressions of the current spectra of earthquake bedrock motion are compared and the preferred one is selected;but also the high-cut filter function is modified to fit the recorded earthquake motion of target fields in China.Then,the current SSI calculation model for structural seismic response analysis is expounded essentially;and the unnegligible problem inherent in the model is pointed out.To solve the problem,the massless rigid element(MRE) method proposed by the authors to solve the problem inherent in the earthquake ground displacement input model is extended and applied to solve the corresponding problem in the current bedrock displacement input model considering SSI effect.At last,based on the works above,the program for generating bedrock displacement spectrum is coded and a soil-layers model is analyzed.The analysis results can further indicate that the MRE method is quite applicable to the calculation model considering SSI effect.The works of this paper can provide necessary reference for the relevant study of SSI effect.更多还原