八层大开间砌体模型结构的模态分析

Mode analysis for a 8-storied,big-bay model building with concrete hollow block

为分析建造在7度地震区小型混凝土空心砌体八层大开间隔震房屋的抗震性能,建立隔震八层大开间的三维砌体结构有限元模型,在基础与结构物底部安放夹层橡胶垫,对其隔震前后进行模态分析,并按相似理论设计制作1∶4的砌体模型结构并进行实验.结果表明:夹层橡胶垫能延长上部结构的自振周期,减小上部结构的地震反应,有限元结果与实验结果误差小于±5%,说明建立的砌体结构有限元模型是正确的.

In order to study the earthquake behavior of a 8-storied,big-bay isolated building with small-size concrete block in earthquake regions of intensity 7,a 3-dimensional finite-element model with ANSYS was proposed.Sandwich rubber bearings were simulated between the foundation and the bottom of the model structure,and the mode analysis was undertaken before and after isolation,a model at 1/4 scale of the masonry building was designed and fabricated by theory of similitude,the results show that the sandwich rubber bearings can extend the natural period of vibration and can reduce the quake response of the upside structure,the relative error of the finite element and experiment result is less than 5%,the finite element model of the masonry structure is correct.