防屈曲支撑混凝土框架结构抗震性能试验研究  

Experimental research on seismic performance of BRB concrete frames

作　　者：顾炉忠[1] 高向宇[1] 徐建伟[1] 胡楚衡[1] 武娜[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》2011年第7期101-111,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(50678013)

摘　　要：设计制作了三榀侧移刚度相同但防屈曲支撑及框架截面形式不同的混凝土框架,分别为普通梁单斜撑、宽扁梁单斜撑、普通梁人字撑,对其进行拟静力试验,研究了防屈曲支撑混凝土框架的抗震性能,包括混凝土结构的开裂及其发展状况、荷载-侧移滞回曲线、刚度退化、骨架曲线、防屈曲支撑水平荷载-轴向变形曲线等。研究结果表明:设计的防屈曲支撑及混凝土框架具有优异的协同工作性能,水平荷载-侧移滞回曲线饱满,防屈曲支撑可在较小层间位移角时进入屈服消能状态,在大位移下不失效,耗能稳定,能显著增加结构阻尼,有效降低地震反应,改善结构性态。所设计的框架节点、预埋件及连接构造受力可靠。Three buckling-restrained brace concrete frames（BRBCF） with different BRB or beam sections,which were normal reinforced concrete beam with monoclinic BRB,flat beam with monoclinic BRB,normal reinforced concrete beam with invert-V BRB,were designed,manufactured and tested by quasi-static test.The seismic performance,including cracks on concrete elements,lateral load-displacement loops,skeleton curves,tangent stiffness and its degradation,and BRB load-deformation curves,were studied.Test results show that the BRB and concrete frame can effectively work together to resist lateral force.The system has plump and stable hysteric load-displacement curves.The BRB can start to dissipate energy by yielding at relatively small story drift ratio,and avoid failure at large lateral drift ratio.It is validated that the equivalent viscous damping can thus be increased and the seismic response be reduced,resulting in an improved structural performance.The designed concrete joints,the embedded parts and the connectors function well and reliably.

关 键 词：混凝土框架 防屈曲支撑 拟静力试验 消能减震 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1