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研究了随机地震激励下土层地震反应及土-结构相互作用分析中有限土域的取值范围对计算精度的影响。分别以基岩白噪声谱和杜修力修正基岩谱作为输入,进行了土层随机地震反应分析,探讨了自由边界、固定边界和黏弹性边界3种人工边界条件下土域的取值范围、土介质阻尼和土体长深比(L/H)对土层随机地震反应的影响,给出了侧向人工边界合理位置的具体建议。在此基础上,选取土体的合理边界范围,建立土-结构相互作用分析模型,分别以基岩白噪声谱、杜修力修正基岩谱以及实测地震波功率谱作为输入,进行了土-结构相互作用体系随机地震反应分析,计算结果验证了侧向人工边界取值在土-结构相互作用体系随机地震反应分析中的有效性。
The influence of the range of finite soil on the seismic response and soil-structure interaction under random seismic excitation is studied. Based on the white noise spectrum of bedrock and the revised DujiLi correction bedrock spectrum respectively, the stochastic seismic response analysis of the soil layer is carried out. The range of soil domain under the three artificial boundary conditions of free boundary, fixed boundary and viscoelastic boundary is discussed. The influence of medium damping and L / H ratio on the random seismic response of the soil is given, and the concrete suggestions of the reasonable position of the lateral artificial boundary are given. On this basis, the reasonable boundary of soil mass is selected and the soil-structure interaction model is established. Based on the bedrock white noise spectrum, Du Xiu-Li modified bedrock spectrum and the measured seismic power spectrum, the soil-structure interaction The results of random seismic response analysis show that the lateral artificial boundary is validated in the random seismic response analysis of soil-structure interaction system.