三阶屈服屈曲约束支撑耗能机理及设计方法研究  

STUDY ON ENERGY DISSIPATION MECHANISM AND DESIGN METHOD OF TRIPLE YIELD BUCKLING-RESTRAINED BRACE

作　　者：胡宝琳[1] 徐世安 徐庆 吴仁杰 HU Bao-lin;XU Shi-an;XU Qing;WU Ren-jie(Department of Civil Engineering,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院土木工程系,上海200444

出　　处：《工程力学》2023年第8期105-114,共10页Engineering Mechanics

基　　金：国家科技重大专项项目(2018ZX06001001);国家自然科学基金项目(52078287)。

摘　　要：屈曲约束支撑(BRB)在拉压荷载作用下受力基本对称,其滞回曲线饱满,是一种耗能效果优良且广泛在工程中应用的耗能构件。传统屈曲约束支撑在多遇地震作用下不发生屈服,无法为结构提供耗能,且无法兼顾不同强度地震作用的使用需求。基于此,提出一种能够三阶屈服的屈曲约束支撑(TYBRB),并通过理论和模拟相结合对其工作原理及力学性能进行了系统的研究。介绍了TYBRB的构造组成及工作机理;在力学分析的基础上,建立了TYBRB的刚度方程,给出了各阶屈服力和屈服位移的计算方法;并采用ABAQUS有限元软件进行数值模拟,分析了TYBRB受力性能和抗震优越性。研究结果表明:TYBRB可以在较小变形情况实现一阶、二阶屈服进行耗能,具有明显的三阶屈服效果,可兼顾不同强度地震作用实现分阶段屈服耗能,且耗能性能优越。Under the action of tension and compression loads,the force of buckling-restrained brace(BRB)is basically symmetrical and has a full hysteretic curve.It is an energy dissipation component widely used in engineering structures with excellent energy dissipation effect.The traditional BRB does not yield under frequent earthquakes and is unable to provide energy dissipation for structures,and cannot consider the usage requirements of seismic action with different intensities.Based on this,a triple yield buckling-restrained brace(TYBRB)is proposed,and its work principle and mechanical properties are systematically studied through the combination of theory and simulation.The structural composition and working principle of TYBRB are introduced;based on the mechanical analysis,the stiffness equation of TYBRB is established,and the calculation methods of yield bearing capacity and yield displacement of each level are given.The numerical simulation of TYBRB is carried out by ABAQUS,and its mechanical performance and seismic performance superiority are analyzed.The research results show that TYBRB can realize energy dissipation for the first and second yield under small deformations,has obvious triple yield effect,can realize the staged yield energy dissipation by taking into account the seismic action of different intensities,and the energy dissipation performance is superior.

关 键 词：三阶屈服 耗能性能 构造组成 工作原理 设计方法 

分 类 号：TU352.1[建筑科学—结构工程]