复杂博物馆结构的隔震效应及地震响应分析

Earthquake Response Analysis and Isolated Effect on a Complicated Base-Isolated Museum Structure

对具有竖向构件不规则、楼板开洞面积大、四周悬挑梁等特征的复杂混凝土框架—钢支撑博物馆结构,采用隔震技术处理后,基于时程分析法进行了层间位移、层间剪力等的地震响应分析,隔震后结构加速度响应仅为输入的30%～60%,最大层间剪力约为非隔震的40%。还根据基底剪力和外力做功等效原则提出了复杂结构模型向简化计算模型转化的等效刚度和隔震层位移等计算式,并对博物馆隔震结构进行了地震响应分析。计算结果表明,简化分析方法的计算精度与时程分析法相近。所提简化计算方法计算简便且具有较好的分析精度,可用于复杂隔震结构地震响应的快速分析。

For a complicated base-isolated museum structure with vertical irregularity, discotinuous floor slabs and cantilever beams, time domain analysis on story drifts and story shear forces were carried on after isolation process. Results show that acceleration responses of isolated structure are just 30% -60% of input seismic motions and the max story shear force of isolated structure is just 40% of non-isolated. According to equivalent principles for base shear force and energy of common and simplified models, two-mass calculation method was suggested and used to calculate responses of the isolated museum structure. Results of time history analysis were consistent with the simplified analysis method. Simplified calculation method mentioned in this paper of- fers a quick calculation and has a certain accuracy, which can be used in fast analysis of complicated isolated structures.