防屈曲支撑性能指标及其工程应用研究

Research on performance index of BRB and its engineering application

基于美国规范ASCE41-13中对防屈曲支撑(BRB)性能指标的限值规定,采用大型非线性有限元分析软件ABAQUS,模拟分析了防屈曲支撑在不同性能水准下的受力性能和损伤程度,验证了美国规范性能指标限值的可行性,并结合实际工程实例,研究了防屈曲支撑性能指标对构件性能评估的意义,及其在基于性能的结构抗震设计中的应用.结果表明:有限元计算结果能准确地模拟防屈曲支撑的受力变形状态并验证其性能指标的正确性;该性能指标在基于构件性能的结构抗震评估研究中具有重要意义.

Based on the limits of the performance index of buckling-restrained braces（BRBs）in the American code（ASCE41-13）,a numerical study is carried out with the nonlinear finite element analysis software ABAQUS to investigate the mechanical performance and damage degree of BRBs at different performance levels and to verify the limits of the performance index in the American code.Combined with engineering examples,the significance of the performance evaluation of structural members is studied and the application in the performance-based seismic design is discussed.It is shown that the results of finite element computations can accurately model the forces and deformations of BRBs and verify the validity of the performance index.The performance index is of important significance for the structural seismic evaluation based on the performance of components.