橡胶隔震支座建筑隔震层位移幅值分析

对橡胶隔震支座建筑采用多质点层间等效剪切模型,通过动力时程分析,研究了影响隔震层位移幅值变化的各种因素·结果表明,场地类别,地震烈度,隔震后结构基本周期,隔震层等效阻尼比是影响位移幅值的主要因素,隔震建筑在一类场地上位移幅值最小,通过调整隔震层的等效阻尼比可以有效控制位移幅值·建造在一,二和三类场地上的低层和多层规则型橡胶隔震支座建筑,通过对大量动力分析结果采用多元回归分析方法,得出罕遇地震作用下隔震层位移幅值简化计算公式,精度满足工程设计的要求·

Analysis of the Maximum Displacement of Isolation Layer for Base-isolated Buildings with Rubber Bearings

Through an equivalent interlaminar shear model with multi-degree of freedom for base-isolated buildings with laminated rubber bearings, the maximum displacement of isolation layer is discussed, adopting dynamical time-history analysis. The results show that the influencing factors on the maximum displacement of isolation layer are mainly the site classification, earthquake intensity, structural period of base-isolated building and equivalent viscous damp ratio. It was found that the amplitude of displacement of isolation layer is minimum in the site class I and adjusting the damp ratio can control efficiently the amplitude of displacement. By way of regression-analysis, a simplified calculation formula of maximum displacement of isolation layer is provided for regular base-isolated buildings of low and multi-storey in site class I, II and III, of which the accuracy will meet the requirements of engineering design.