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软夹层地基条件必将会对隔震结构的隔震效率及其动力反应特性产生一定的影响。鉴于此,基于软夹层地基上基础隔震结构地震反应的振动台模型试验结果,对比分析了不同频谱特性和不同强度地震动作用下软夹层地基、基础隔震层和隔震结构的振动加速度反应特征,初步给出了软夹层地基上土–桩–隔震结构动力相互作用体系的振动反应特性及其规律。结果表明,试验设置的模型地基基本上能够反映软夹层地基的地震反应特性。同时,输入地震动频谱特性及其强度对软夹层地基上基础隔震层的隔震效率及其隔震结构的动力反应规律都具有明显的影响,造成上述影响的主要原因应为软夹层地基明显改变了输入地震动的频谱特性和强度,起到了天然隔震的作用,其具体影响规律和影响程度还需做进一步的深入研究。
Soft ground conditions will surely affect the isolation efficiency and the dynamic response of the isolated structure. In view of this, based on the results of shaking table tests on the seismic response of the base-isolated structure on the soft mei foundation, the vibration acceleration responses of the soft interlayer, the base isolation layer and the isolation structure under different spectral characteristics and different intensities of ground motions The characteristics of vibration response of the soil-pile-isolation structure dynamic interaction system on soft ground are preliminarily given. The results show that the model foundation set by the experiment basically reflects the seismic response characteristics of the soft interlayer foundation. At the same time, the frequency spectrum characteristics and the intensity of input ground motion have a significant influence on the isolation efficiency of the basement isolation layer and the dynamic response of the isolation structure on the soft interlayer foundation. The main reason for the above-mentioned impact is that the foundation of the soft interlayer should be obviously It changed the spectral characteristics and intensity of input ground motions and played the role of natural isolation. The specific rules of influence and degree of influence need to be further studied.