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为掌握地震频谱特性、隔震支座及上部结构力学性能对隔震结构地震响应的影响,以PGA/PGV(地震动峰值加速度与速度比值)代表频谱特性选取地震波,研究其力学特性即上部结构刚度、隔震层力学特性(初始刚度、屈服力和屈服后刚度)对结构地震响应的影响特性。结果表明:场地条件对隔震结构的地震响应呈明显规律性,上部结构刚度的影响可忽略不计;在长周期低频型地震动场地下,屈服后刚度的选择要在隔震层的位移和剪力两者寻求最优,较大初始刚度和屈服力能减小隔震层的地震响应;而短周期高频型的地震动场地下,屈服后刚度对隔震结构的影响很小,初始刚度和屈服力越小隔震结构地震响应越小。分析结果可为隔震结构设计达到经济合理效果提供参考依据。
In order to understand the influence of earthquake spectrum characteristics, isolation bearings and the superstructure mechanical properties on the seismic response of the isolated structure, the seismic characteristics of PGA / PGV (seismic peak acceleration and velocity ratio) Stiffness, mechanical properties of isolation layer (initial stiffness, yield strength and post-yield stiffness) on structural seismic response characteristics. The results show that the seismic response of the isolated structure is obviously regular and the influence of the superstructure stiffness is negligible. In the long-period low-frequency ground motion field, the choice of post-yield stiffness should be based on the displacement and shear of the isolation layer For the short-period and high-frequency ground motion fields, the post-yield stiffness has little effect on the isolation structure, and the initial stiffness The smaller the yield strength, the smaller the seismic response of the isolated structure. The results of the analysis can provide a reference for the design of isolated structures to achieve economic and reasonable results.