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针对钢筋混凝土框架结构,提出了残余位移的近似计算方法,选取了合适的层间残余位移指标,通过非线性时程分析,研究了强震下结构层间残余位移的分布规律和影响因素,建立了层间残余位移的简化计算公式.结果表明:当采用自由振动法计算强震下钢筋混凝土框架结构的残余位移时,地震波持时延长宜大于等于结构基本周期的10倍;随着材料强度等级的增加,结构层间残余位移系数在总体上降低;随着楼层屈服强度系数变大,结构层间残余位移系数减小,且二者之间近似存在指数函数关系.
Aiming at the reinforced concrete frame structure, an approximate calculation method of the residual displacement is proposed. The appropriate inter-layer residual displacement index is selected. Through nonlinear time-history analysis, the distribution law and influencing factors of the residual displacement of the structure under strong earthquake are studied. A simplified calculation formula for the residual displacement between layers is presented. The results show that when the free vibration method is used to calculate the residual displacement of a reinforced concrete frame structure under strong earthquakes, the seismic wave holding time extension should be equal to or greater than 10 times the fundamental period of the structure; with the material strength grade With the increase, the residual displacement coefficient between structural layers decreases as a whole; as the floor yield strength coefficient increases, the residual displacement coefficient between structural layers decreases, and there is an approximate exponential function relationship between the two.