方钢管混凝土柱-不等高钢梁框架节点抗剪承载力分析  

Analysis on shear capacity of frame joints with concrete-filled square steel tubular columns and unequal height steel beams

作　　者：许成祥[1] 费建宝 简齐安 彭胜 XU Chengxiang;FEI Jianbao;JIAN Qian;PENG Sheng(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065

出　　处：《世界地震工程》2020年第4期53-61,共9页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(51678457)。

摘　　要：为研究方钢管混凝土柱-H型不等高钢梁框架节点的抗剪承载力,分析其破坏机理,建立适用于不等高钢梁节点的抗剪计算模型,提出了节点的抗剪承载力计算公式,比较了基于不同抗剪模型建立的抗剪承载力计算值与试验值的差异性。结果表明:节点域的破坏模式主要为上核心区的剪切斜压破坏;节点域抗剪承载力主要由钢管腹板、核心区混凝土主斜压杆及约束斜压杆共同承担。对比分析表明:提出的节点屈服抗剪承载力和极限抗剪承载力理论公式计算值更为接近试验值,验证了方钢管混凝土柱-不等高钢梁框架节点传力机理和承载力计算公式的正确性。In order to evaluate the shear capacity of the frame joints composed of concrete-filled square steel tubular columns and H-shaped unequal height steel beams,the failure mechanism was analyzed,a shear capacity calculation model for unequal height steel beam joints was established,and the calculation formulas of shear capacity of joints were put forward,shear bearing capacities calculated from different shear models were compared with the experimental values.The results indicate that the typical failure mode of the panel zone is shear diagonal compression in the top core region.The shear capacity of the panel zone is shared by the steel tube webs,the main compression strut and the confined compression strut in the concrete core.Comparative analysis show that the proposed calculated values of the yield shear capacity and ultimate shear capacity are closer to the experimental values,which verified the correctness of the load transferring mechanism and bearing capacity model of the joints of square steel tubular columns-unequal height steel beams.

关 键 词：方钢管混凝土柱 不等高钢梁 框架节点 抗剪承载力 斜压杆 

分 类 号：TU398.9[建筑科学—结构工程]