Comparative analysis of seismic response of story isolation and base isolation structures considering SSI effect
In order to explore the difference of seismic response of story isolation and base isolation structures on different foundations after considering SSI effect,a regular structure suitable for isolation technology is selected.Shaking table test is carried out on a 5-layer scale regular structure model to explore the dynamic characteristics and seismic response of the structure on rigid foundation,hard soil(vs=300m/s)and soft soil(v,=80m/s).The results show that for the model,the isolation effect of the base-isolated structure is better than that of the story-isolated structure when considering the SSI effect;the natural vibration period of the upper isolation structure and the base isolation structure on the soil foundation is longer than that on the rigid foundation.The foundation soil has obvious amplification and filtering effect on the seismic wave.The soft soil foundation can obviously enhance the low frequency component and filter the high frequen-cy component in the seismic wave.The comparative analysis reveals that the displacement response of the lower structure of the isolation structure on the soil foundation is significantly enlarged when considering the SSI effect,which should be considered in engineering applica-tions.
万方数据
维普
