刚度控制对自复位屈曲约束支撑框架抗震性能的影响  

Influence of stiffness control on the seismic performance of self⁃centering buckling⁃restrained braced frames

作　　者：谢钦[1,2] 周臻 黄林杰[3] XIE Qin;ZHOU Zhen;HUANG Linjie(Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China;Research Center of Space Structures,Guizhou University,Guiyang 550025,China;College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]贵州大学空间结构研究中心,贵阳550025 [3]南京林业大学土木工程学院,南京210037

出　　处：《东南大学学报(自然科学版)》2025年第2期435-443,共9页Journal of Southeast University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52108449,52208480);中国博士后科学基金资助项目(2021M690621).

摘　　要：在自复位屈曲约束支撑(SC⁃BRB)中引入橡胶夹层端板使橡胶垫刚度与套管刚度串联,在不削减钢构件尺寸的前提下通过改变橡胶垫厚度可以实现对支撑初始刚度的灵活控制。为了研究刚度控制对SC⁃BRB框架性能的影响,对支撑的三线性旗帜形滞回性能和采用不同方法(基于力和基于位移的设计方法)设计的SC⁃BRB框架抗震性能开展数值分析。结果表明:刚度控制避免了因改变强度比β导致的支撑塑性阶段最大承载力增大,但不会改变β对支撑耗能能力和自复位性能的影响;刚度控制与参数β相结合,可减小基于力的方法设计的SC⁃BRB框架的最大层间位移角,但对基于位移的方法设计的SC⁃BRB框架的位移响应影响很小;通过刚度控制减小自复位系统的第一刚度,可以减小SC⁃BRB框架地震时的最大楼层加速度。The rubber sandwich end plate is introduced into the self⁃centering buckling⁃restrained brace(SC⁃BRB)so that the rubber pad stiffness is in series with the tube stiffness,and the brace initial stiffness can be flexibly controlled by changing the thickness of rubber pad without reducing the steel member size.To in⁃vestigate the impact of stiffness control on the performance of SC⁃BRB frames,the numerical analysis was used to the trilinear flag⁃shaped hysteretic performance of braces and the seismic performance of SC⁃BRB frames designed by different methods(force⁃based and displacement⁃based design methods).The results show that the stiffness control avoids the increase of the maximum bearing capacity of braces at the plastic stage due to the change of strength ratioβ,but does not alter the impact ofβon the energy dissipation capacity and self⁃centering performance of braces.The combination of stiffness control and parameterβcan decrease the peak story drift angle of SC⁃BRB frames designed by force⁃based design method,but exerts little influence on the displacement response of SC⁃BRB frames designed by displacement⁃based design method.By reducing the first stiffness of the self⁃centering system through stiffness control,the maximum floor acceleration of SC⁃BRB frames during earthquakes can be reduced.

关 键 词：自复位 三线性模型 刚度控制 支撑框架 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程]