自复位可更换软钢耗能支撑性能研究  

RESEARCH ON THE BEHAVIOR OF SELF-CENTERING REPLACEABLE MILD STEEL ENERGY-DISSIPATING BRACES

作　　者：张艳霞[1,2] 李振兴[1] 刘安然[1] 李瑞[1] 刘学春[3] 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学北京未来城市设计高精尖创新中心,北京100044 [3]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《工程力学》2017年第8期180-193,共14页Engineering Mechanics

基　　金："十三五"国家重点研发计划项目(2016YFC0701504);国家自然科学基金面上项目(51278027)

摘　　要：传统屈曲约束支撑结构在震后残余变形较大,不易修复或更换。该文提出一种新型自复位可更换软钢耗能支撑,提出了理论设计方法。制作了缩尺比例为0.6的试验构件并进行了低周往复加载试验同时对试验进行了数值模拟,与试验结果进行对比并作进一步分析。研究结果表明:新型支撑中软钢耗能件可以实现良好的高阶屈曲耗能,在加载过程中支撑主体构件无塑性发展;同时残余变形很小,结构有着良好的自复位能力和受力性能。软钢夹持间距的适当减小,软钢耗能件的多阶屈曲变形和塑性发展更为理想,提高了支撑的耗能能力,尤其改善了支撑在受压时的耗能能力。在更换了软钢耗能件后,支撑仍可以继续工作,实现了新型支撑"自复位可更换"的设计目标。Traditional buckling restrained braces are widely used in buildings, but the structure may have large residual deformation after earthquakes, which is not easy to repair. This paper presents a new self-centering replaceable mild steel energy-dissipating brace and a theoretical design method. Low cyclic loading tests on the new brace specimens with the scale factor of 0.6 were conducted to study the mechanical performance. Besides, numerical simulation is carried out, and the results are compared with the test. The results show that the new self-centering replaceable mild steel energy-dissipating braces can achieve good energy dissipating performance through high-order buckling, the plastic deformation of the main body is not affected during the loading process. Meanwhile, the residual deformation is very small and the structure has a good self-centering capacity and mechanical performance. The appropriate reduction of the distance between the steel brackets, the multi-order buckling and plastic development of the mild steel energy dissipating members are preferred, because the energy dissipation capacity of the braces can be improved especially when the braces are under compression. With the replacement of the mild steel energy-dissipating segments, the braces can continue to work. The design objective of self-centering replaceable mild steel members can be achieved.

关 键 词：自复位 可更换 软钢耗能支撑 夹持距离 有限元分析 性能研究 

分 类 号：TU352[建筑科学—结构工程]