复合自复位结构基于概率的性能评估

发布时间：2018-04-28 18:50

本文选题：自复位复合结构 + 基本功能分区　；参考：《建筑结构学报》2017年08期

【摘要】：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。
[Abstract]:The composite self-reset structure system is composed of basic functional partition (main structure) and damage control zone (sub-structure). For basic functional partition, the normal function of the structure can be realized, and most of the earthquake action and all the gravity load can be carried out. For damage control zone, self-reset and energy dissipation can be realized, the residual seismic action and the reduction of the degree of interstory displacement concentration can be reduced, and the self-reset energy dissipation framework can be realized. Based on the design method of stiffness requirement, three kinds of composite self-reset structures with BRB as energy dissipation mechanism and self-reset damper as energy dissipation mechanism are designed respectively. The maximum interlayer displacement angle and residual interlayer displacement angle are taken as variables and the joint probability density function is used to evaluate the performance of three composite self-reset and uncontrolled structures. Based on the analysis of the evolution of the joint probability density function, the vulnerability curve and the interlayer displacement concentration coefficient, the results show that the composite self-reset structure can effectively reduce the mean and dispersion of the maximum interlayer displacement angle and the residual interlayer displacement angle of the structure. The composite self-reset structure with self-reset damper as the energy dissipation mechanism has the best control effect, and the composite self-reset structure can effectively reduce the influence of residual displacement on the damage probability of the structure. The composite self-reset structure can better control the concentration coefficient of interstory displacement and reduce the possibility of weak layer appearing.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【分类号】：TU352.11

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