用带防屈曲支撑的内嵌式钢框架加固混凝土框架的试验研究  

EXPERIMENTAL STUDY ON REINFORCED CONCRETE FRAMES RETROFITTED WITH IN-FILLED STEEL FRAMES AND CONNECTED BRBS

作　　者：武娜[1,2] 高向宇[1] 李自强 任洁[1] 黄海涛[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]中国建筑科学研究院,北京100013 [3]北京市住房与城乡建设委员会,北京100039

出　　处：《工程力学》2013年第12期189-198,共10页Engineering Mechanics

基　　金：北京市住房和城乡建设委员会科技项目(BJJQ-2010-169-01)

摘　　要：针对既有混凝土框架抗震性能的不足,研究增设防屈曲支撑(BRB)的消能减震加固技术方案。为尽量减少原主体结构的受力负担、提高加固效果,设置了内嵌式钢框架并安装BRB,对加固后的混凝土框架进行了试验研究。该文设计、制作了2榀用此法加固的混凝土框架,1榀纯混凝土框架作为对比。通过低周反复荷载试验,研究了荷载-侧移滞回曲线、骨架线、支撑轴向变形曲线、等效刚度及退化规律、等效粘滞阻尼比等抗震减震性能。结果表明设计的减震加固混凝土框架荷载-侧移滞回曲线饱满,BRB耗能稳定,能显著提高结构承载力,增加结构阻尼,有效降低地震反应。内嵌式钢框架传力可靠,可有效平衡支撑承载力,充分发挥BRB的作用,挖掘梁、楼板的延性潜力,改进了受力工作机制,抗震性能改进明显。To improve seismic properties, some existed concrete frames are retrofitted with Buckling-Restrained Brace （BRB）. Considering the insufficient seismic-bearing capacity of the original structures, in-filled steel frames and connected BRBs are used to retrofit. Three concrete frames are designed, built and tested. Two of them are retrofitted with in-filled steel frames and BRB （BRBCF）, and the other one is an ordinary frame, which is designed for a comparison. Seismic performance of the frames, including the shear force-lateral displacement hysteretic curves, the skeleton curves, the axial deformation loops, the statistics on equivalent stiffness and the damping ratios, are tested and studied. The results of the tests show that the force-displacement hysteretic curves of the retrofitted frames are stable in shape; the BRB＇s energy-dissipation ability is stable. It is proved that the load-bearing capacity and structural damping can be both increased in this way. Consequently, the in-filled steel frames can balance the load-bearing capacity of BRBs, which protect the original frames from suffering moresevere shear force, excavate the potential ductility of the reinforced concrete floor and beams, and improve the working mechanics. The seismic performance is improvedobviously

关 键 词：结构工程 加固 防屈曲支撑 抗震机理 混凝土框架 

分 类 号：TU317.1[建筑科学—结构工程]