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按建筑结构抗震规范的规定构造加速度反应谱并将其作为随机激励,构造了四川地区典型公共钢筋混凝土框架结构有限元模型,采用拟动力时程方法对结构的抗震性能进行计算,得到了钢筋混凝土框架结构的易损性曲线.针对原型结构在地震作用下柱基础容易发生屈服破坏的情况,对原型结构基础采取了铅芯阻尼橡胶支座隔震加固措施,对加固后的框架结构进行了计算并得到了修正的易损性曲线.通过对比得到在地基不失稳的前提下,小震时结构发生中度以上损伤的概率非常小,大震时随着承重结构进入塑性屈服发生中度以上的损伤概率开始逐渐变大,而且钢筋混凝土框架结构纵横2个方向的易损性概率在大震时有差异,采取隔震加固措施后结构损伤概率明显减小.
According to the seismic code of building structure, the acceleration response spectrum is constructed and used as random excitation to construct the finite element model of typical public reinforced concrete frame in Sichuan. The quasi-dynamic time-history method is used to calculate the seismic performance of the structure, and the reinforced concrete Vulnerability curve of the frame structure.Aiming at the failure of the column foundation prone to yield failure under the action of earthquake, the lead frame damping rubber bearing isolation and reinforcement measures are taken as the basis of the prototype structure, and the reinforced frame structure is calculated And got the modified vulnerability curve.Comparison shows that under the precondition that the foundation is not destabilized, the probability of medium-scale damage in the case of small earthquakes is very small, and when the load-carrying structure enters into the plastic yielding moderately above The probability of damage in two directions of reinforced concrete frame structure varies greatly in large earthquake and the probability of structural damage decreases obviously after isolation and reinforcement measures are taken.