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隔震支座在地震作用过程中水平变形时,会对上部结构附加由于隔震支座P-Δ效应造成的弯矩。国内,关于隔震支座的P-Δ效应对基础隔震结构地震响应具体影响相关的研究,相对较少。采用PERFROM-3D软件,建立上部结构弹塑性的基础隔震结构模型,进行了考虑与不考虑隔震支座P-Δ效应的计算分析,对比了层剪力系数、层间位移、层倾覆弯矩、加速度等地震响应。结果表明:隔震支座的P-Δ效应对基础隔震结构的底层层间位移响应及上部结构柱底转角位移造成一定影响,其它地震响应基本无差异。
When the seismic isolation bearing is horizontally deformed during the seismic action, the bending moment due to the P-Δ effect of the seismic isolation bearing is added to the superstructure. In China, there are relatively few studies on the P-Δ effect of the isolated bearings on the concrete impact of the seismic response of the base-isolated structure. Based on PERFROM-3D software, the elasto-plastic base-isolated structure model of the superstructure is established. The calculation and analysis of the P-Δ effect of the isolated bearings are carried out with and without considering the relationship between the layer shear force coefficient, interlayer displacement, Moment, acceleration and other seismic response. The results show that the P-Δ effect of the isolated bearings has some influence on the displacement response of the basement isolation structure and the displacement of the superstructure bottom column. The other seismic responses are basically the same.