端部加强型组合热轧角钢防屈曲支撑静载试验研究  

Static tests on buckling restrained brace made of hot-rolled steel angle with strengthened ends

作　　者：高向宇[1] 王永贵[1] 刘丹卉[1] 徐建伟[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《建筑结构学报》2010年第3期77-82,共6页Journal of Building Structures

基　　金：北京市自然科学基金项目(8062009);国家自然科学基金项目(50678013)

摘　　要：提出用端部加强方法制作组合热轧角钢防屈曲支撑的钢芯。设计、制作并测试了7个试件,其中热轧角钢防屈曲支撑试件4个、对比热轧钢板试件3个。端部加强型角钢钢芯采用了两种截面(错十字形和T形)、两种组合方式(工作段焊接与非焊接),用端部焊接加强板的方法形成弱化工作段,主要优点是加工方便、降低造价。热轧钢板试件采用钢板焊接并切削成型。试验中设计改进了加载装置,采用静力反复加载方法加载。研究了包括轴向荷载-轴向变形滞回曲线、累计塑性变形、极限变形能力、刚度退化以及等效阻尼比等抗震性能。研究表明,用这种成型方法制作的组合热轧角钢防屈曲支撑构造简单,耗能能力、延性等抗震性能可满足建筑结构消能减震设计的需求。A new type of BRB（buckling-restrained braces） is designed and tested. With both ends strengthened, the braces are made of hot-rolled steel angle core. It has an advantage of simple and effective for manufacturing with low price. Seven specimens were tested, including four BRAB （buckling-restrained angle brace） with two cross section types （quasi-cross and T section） at combination methods （welded or without welding）, three BRB made of hot-rolled steel plate for comparison. Cyclically static loading tests were conducted. Seismic behaviors, such as force-deformation hysteresis loops, accumulated plastic deformation, and tangent stiffness and its deterioration, as well as equivalent damping ratio are studied. It is validated that the new BRB using angle core has a reliable performance with high energy dissipation property and can be used to satisfy design requirements for buildings in seismic region.

关 键 词：防屈曲支撑 热轧钢材 抗震设计 减震 

分 类 号：TU317.1[建筑科学—结构工程]