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复合自复位结构体系由基本功能分区(主结构)和损伤控制分区(次结构)组成,对于基本功能分区,可实现结构的正常使用功能,承担大部分的地震作用和全部的重力荷载,由传统的框架结构实现;对于损伤控制分区,可实现自复位和耗能,分担剩余的地震作用和降低结构的层间位移集中程度,可由自复位耗能框架实现。基于刚度需求的设计方法分别设计了无耗能机制、以BRB作为耗能机制和以自复位阻尼器作为耗能机制的三种复合自复位结构。将最大层间位移角和残余层间位移角作为变量,采用联合概率密度函数对三种复合自复位结构和无控结构进行性能评估。根据对联合概率密度函数演化、易损性曲线和层间位移集中系数的分析,结果表明:复合自复位结构可以有效降低结构最大层间位移角和残余层间位移角的均值和离散性,其中,以自复位阻尼器作为耗能机制的复合自复位结构具有最好的控制效果;复合自复位结构可以有效降低残余位移对结构损伤概率的影响;复合自复位结构可以较好地控制结构层间位移集中系数,降低薄弱层出现的可能性。
The composite self-resetting structural system is composed of basic functional zones (main structure) and damage control zones (substructures). For the basic functional zones, the normal function of the structure can be realized, and most of the seismic actions and all the gravity loads are undertaken. For the damage control zone, self-resetting and energy dissipation can be realized, sharing the residual seismic action and reducing the concentration of interlayer displacement in the structure can be realized by the self-resetting energy dissipation framework. Based on the design of stiffness requirements, three kinds of self-resetting structures with no energy dissipation mechanism, BRB as energy dissipation mechanism and self-resetting damper as energy dissipation mechanism are designed respectively. Taking the maximum inter-story drift angle and the residual inter-story drift angle as variables, the performance of three composite self-resetting structures and uncontrolled structures was evaluated by joint probability density function. Based on the analysis of the evolution of joint probability density function, the vulnerability curve and the concentration coefficient of interlayer displacement, the results show that the compound self-resetting structure can effectively reduce the mean and dispersion of the displacement angle between the maximum layer and the residual layer, of which The self-resetting structure with self-resetting damper as the energy dissipation mechanism has the best control effect. The compound self-resetting structure can effectively reduce the influence of residual displacement on the damage probability of the structure. The compound self-resetting structure can control the structure layer Displacement concentration factor, reducing the possibility of the emergence of weak layers.