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结构震后可修复性在现代抗震设计中扮演越来越重要的角色,残余变形作为可修复性的一个主要指标受到广泛的重视。弹塑性时程分析法是研究结构震后残余变形的主要方法,传统通过调整输入波PGA指标得到的计算结果离散性很大,因此需要选择一个合适的地震动强度指标控制输入波的选择。计算60条地震动作用下不同强度折减系数和屈服后刚度系数的双线性SDOF体系残余变形,研究以PGA,PGV,PGD为代表的18个地震动强度指标与残余变形之间的相关系数随SDOF体系周期变化规律。结果表明,不同强度指标与残余变形之间的相关系数受强度折减系数影响很大,基本不受屈服后刚度系数的影响,其中以PGV为代表的速度型强度指标与残余变形之间的整体相关性较好,并且考虑到PGV指标的工程特性,建议进行残余变形计算时,以PGV作为输入波主要控制指标。
Repairable structure after earthquake plays an increasingly important role in modern seismic design. Residual deformation as a major index of reparability has received extensive attention. Elasto-plastic time-history analysis is the main method to study the post-earthquake residual deformation. The traditional calculation results obtained by adjusting the PGA index of the input wave are very discrete. Therefore, a suitable index of ground motion intensity should be selected to control the selection of input wave. The residual deformation of bilinear SDOF system with different strength reduction coefficient and post-yield stiffness coefficient under 60 earthquake actions was calculated. Correlation coefficients between 18 earthquake ground motion strength indexes and residual deformations, including PGA, PGV and PGD With the SDOF system cycle changes. The results show that the correlation coefficient between different strength indexes and residual deformation is greatly affected by the strength reduction coefficient, and is basically unaffected by the yield stiffness coefficient. The integral between the velocity strength index represented by PGV and the residual deformation The correlation is good, and taking into account the engineering characteristics of PGV indicators, it is recommended to calculate the residual deformation, PGV as the main control index of input wave.