【摘要】 研究高阶振型阻尼对高层钢筋混凝土框架剪力墙结构抗震延性折减系数的影响.采用5条地震动记录,通过平面结构的地震弹塑性动力时程分析和静力弹塑性分析,以系统位移延性为指标,探讨结构振型阻尼组合数与刚度特征值、竖向不规则对延性折减系数的综合影响.结果表明:振型阻尼组合数对延性折减系数有重要影响,延性折减系数随振型阻尼组合数增加逐渐减小,当振型阻尼组合数较大时,会处于稳定;振型阻尼组合数与刚度特征值对延性折减系数有交互影响,而振型阻尼组合数与竖向不规则对延性折减系数的交互影响不显著.更多还原

【Abstract】 The effects of higher modal damping on seismic ductility reduction factor for the concrete frame-shear wall buildings are studied.Based on the planar structure and using 5ground motions,the elastoplastic dynamic history analysis and static elastoplastic pushover are performed to investigate the coupling effects of the modal damping number and the stiffness characteristic value,the vertical irregularity of structure on seismic ductility reduction factor on the basis of the global displacement ductility.The results demonstrate that the modal damping number has important effects on seismic ductility reduction factor.Ductility reduction factor decreases with the increasing of the modal damping number,and it is almost invariant as to consider more modal damping number.Modal damping number and stiffness characteristic value have important interaction effects on ductility reduction factor,while modal damping number and vertical irregularity have indistinctive interaction effects.更多还原