直肋和开孔肋对方钢管混凝土短柱轴压性能影响研究  

Study on impacts of straight ribs and perforated ribs on axial compressive performance of square CFST short columns

作　　者：徐兵[1] 吴发红[1] 徐桂中[1] 孔海陵[1] 顾国庆[1] XU Bing;WU Fahong;XU Guizhong;KONG Hailing;GU Guoqing(Civil Engineering Department of Yancheng Institute of Technology,Yancheng 224055,China)

机构地区：[1]盐城工学院土木学院,盐城224055

出　　处：《建筑结构》2020年第13期71-75,共5页Building Structure

基　　金：江苏省高校自然科学基金项目(18KJD560006);江苏省交通运输厅公路局项目(2017-28)。

摘　　要：设置加劲肋可以明显改善方钢管混凝土试件的屈曲性能,提高方钢管混凝土短柱中钢管的约束性能。通过对普通钢管混凝土、设直肋和开孔肋的钢管混凝土试件进行研究,并结合有限元对加劲肋的增强作用机理进行分析。研究结果表明:试件加劲后承载力都得到了有效提高,并且由于加劲肋的存在钢管鼓曲形态由单波型鼓曲变为双波型鼓曲;带肋试件侧边中部混凝土中的应力增大,混凝土受压破坏部位范围更大。从试件性能角度来看,加劲后钢管可以为核心混凝土提供更可靠的约束,其中:直肋试件承载力更高、开孔肋试件延性更大。The stiffener ribs can obviously improve the buckling performance of the square concrete-filled steel tube(CFST) members and enhance the restraint performance of the steel tube in the square CFST short columns. Through the research on the ordinary CFST, the CFST with straight ribs and CFST with perforated ribs, the strengthening mechanism of the ribs in CFST short columns was analyzed combining with the finite element analysis. The research results show that the bearing capacity of the stiffened specimens has been effectively improved, and the shape of steel tube bulging has changed from single wave bulging type to double wave bulging type due to the existence of stiffeners;the stress in the concrete in the middle of the side of the stiffened specimens increases, and the range of concrete compression failure parts is larger. From the point of view of specimen performance, the stiffened steel tube can provide more reliable constraints for the core concrete, among which, the straight rib specimen has higher bearing capacity and the perforated rib specimen has larger ductility.

关 键 词：钢管混凝土短柱 加劲肋 轴压承载力 鼓曲形态 

分 类 号：TU398[建筑科学—结构工程]