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通过开展土-隔震结构动力相互作用体系的大型振动台模型对比试验,研究了刚性地基、硬土地基和软夹层地基3种不同地基上多层隔震结构的地震反应特征和基础隔震效果。结果表明:SSI效应对隔震结构动力特性的影响与地基土性密切相关,当地基土性由刚变柔时,隔震结构体系的一阶自振频率明显降低,阻尼比也明显增大;不同土性地基上SSI效应对隔震结构地震反应的影响并不相同,软夹层地基上SSI效应可能增大也可能减小隔震结构的地震反应强度,而硬土地基上考虑SSI效应时隔震结构的地震反应与刚性地基时的地震反应差别较小;不同土性地基上SSI效应对隔震结构基础隔震效率的影响与地基土性、输入地震动的特性和峰值等相关,其中地基土性的影响最为明显,地基土性越软,基础隔震效率越低。
By carrying out comparative tests on large-scale shaking table of dynamic interaction system of soil-isolation structure, the seismic response characteristics and base isolation effect of multi-story isolation structure on three different foundations of rigid foundation, hard foundation and soft sandwich foundation are studied. . The results show that the influence of SSI on the dynamic characteristics of the isolated structure is closely related to the soil properties. When the local soil properties change from just asymptotically, the first order natural frequency of the isolated structure obviously decreases and the damping ratio also increases obviously. The effect of SSI on seismic responses of isolated structures is not the same on different soil foundations. The SSI effect may increase or decrease the seismic response strength of soft-shelled structures, while considering the effect of SSI on hard foundation The difference between the seismic response of the seismic structure and the seismic response of the rigid foundation is small. The effect of SSI effect on the base isolation efficiency of the isolated structure is related to the soil properties of the foundation and the input ground motions and the peak value. The foundation The most obvious impact of soil, the more soft soil foundation, the lower base isolation efficiency.