大底盘多塔楼结构基础隔震非线性时程分析

针对当前采用比较多的一种结构大底盘多塔楼结构进行分析并提出简化模型,利用有限元方法聚合出其特征矩阵,建立了基础隔震的时程分析计算分析模型,利用MATLAB语言编制了动力计算程序.选择了一幢4塔楼10层,底盘为框架,塔楼为砌体的工程作为数值算例,分别计算这种结构在地震作用下采用隔震和非隔震结构时各个塔楼和各层的位移、加速度、基底剪力等地震响应,将两种情况下的响应进行比较.结果表明该结构采用基础隔震可以显著地降低地震的破坏作用.

Nonlinear time-history analysis of base-isolated building with multi-tower structure and large podium

A structure adopted popularly at present, multi-tower structure with large podium was analyzed first and a simplified model was proposed. Then its characteristic matrix was aggregated by using finite element method and an analytic model for time-history analysis and computation of base-isolated structure was set up. Dynamic computation program was worked out by using MATLAB. Finally, a 10-story 4-tower RC frame was taken as an illustration for numerical computation with this model. The seismic response such as the displacement, acceleration, and base shear force of every tower and story was evaluated for this kind of structure with and without base-isolation in the case of earthquake, respectively. It was shown by comparing the responses between both the cases that the influence of earthquake could be lowered remarkably when base-isolation was used.