弹塑性分析确定连梁刚度折减系数方法的应用

Application of method on stiffness reduction coefficient of coupling beam determined by elastoplastic analysis

中震或大震作用下,通过连梁的损伤耗能保证主体结构的安全。目前结构设计时一般对全楼采用统一的连梁刚度折减系数,这与实际结构中连梁损伤情况不符,也将影响结构中剪力墙受力。通过对结构进行弹塑性分析,得到连梁的损伤状态,进而计算得到连梁刚度折减系数。通过对实际工程进行计算,可以得到如下结论：不同部位的连梁刚度折减系数不同;连梁刚度折减系数受初始配筋影响很小;但受地震波的影响较大,不同的地震波会得到不同的刚度折减系数。

Under the medium or strong earthquake,the damage and energy dissipation of coupling beam can ensure the safety of the main structure. At present,the uniform stiffness reduction coefficient is applied in structural design,which does not match the actual damage of coupling beam and would affect the force of the wall. The elastoplastic analysis was conducted to get the damage state of the coupling beam and its stiffness reduction coefficient was calculated. Through the calculation of an actual project,the following conclusions are drawn,the stiffness reduction coefficient of coupling beam from the different place is different. The initial reinforcement has little influence on stiffness reduction coefficient,however,the ground motion affects stiffness reduction coefficient significantly,the different ground motion results in different stiffness reduction coefficient.