考虑SSI效应的隔震结构体系简化分析方法

Simplified calculation method for isolated structure system with dynamic soil-structure interaction

基于集总参数SR模型,建立了土-隔震结构相互作用体系动力特性的简化分析模型,给出了土-隔震结构体系动力特性参数的简化计算公式;在此基础上,改进了土-隔震结构体系层间剪力及层间变形的简化分析方法;通过本文方法的计算结果与振动台模型试验结果、《抗震设计规范》分析方法的计算结果对比分析,验证了本文提出的简化分析方法的可行性和易用性。对比分析结果同时表明隔震结构层间剪力的计算在小震时可不考虑隔震层转动效应的影响,而大震时应考虑隔震层转动效应的影响。本文提出的简化分析方法能够合理反映土-隔震结构体系的动力相互作用效应,为隔震结构方案设计时评估土-结构相互作用(SSI)效应的影响提供了简便有效的分析方法。

A simplified analysis model for the soil-isolated structure interaction system is proposed on the basis of the sway-rocking model. Some simplified formulas for calculating the dynamic characteristic parameters of isolated structure are derived. At last, an improved simplified method to calculate the inter-story shear force and story drift of the soil-isolated structure interaction system is proposed. The results in this paper are compared with those of shaking table model test and with the specification method in earthquake resistant design code of China. It proves that the proposed simplified method is practical, and it also shows that the turning effects of isolation layer should not be considered for inter-story shear force of isolated structure in the earthquake with low intensity, while it should be considered in the earthquake with high intensity. The proposed simplified method can rationally reflect the effect of soil-isolated structure interaction on the seismic responses of the isolated structures in the schematic de-sign phase.