法兰加劲肋贯穿的中空夹层钢管混凝土连接节点受弯性能研究

Research on Bending Performance of Connection Joints of Concrete-Filled Double-Skin Steel Tube Members with Through Flange Stiffeners

提出了一种法兰加劲肋贯穿的中空夹层钢管混凝土连接节点。该节点在保证节点强度和刚度的同时,可有效降低施工风险。对足尺节点试件进行纯弯试验研究,分析了其破坏形态、抗弯承载力以及中和轴位置。采用有限元软件ABAQUS对试件进行数值模拟分析。结合试验和数值模拟结果,分析了法兰加劲肋贯穿的中空夹层钢管混凝土连接节点应力发展过程和螺栓受力情况。对法兰板厚度、贯穿加劲肋数量、加劲肋高度以及螺栓规格对节点受弯性能的影响规律进行了参数分析,建议了各参数的取值范围。最后,结合法兰加劲肋贯穿的中空夹层钢管混凝土连接节点受弯力学特征,提出法兰节点的设计方法。

A connection joint of concrete-filled double-skin steel tube(CFDST)with through flange stiffen-ers has been proposed,which effectively reduces construction risks while ensuring the strength and stiffness of the joints.Full-scale specimens were subjected to pure bending tests to investigate their failure modes,bending capacity,and neutral axis position.The finite element software ABAQUS was employed for numer-ical simulation analysis of the specimens.Combining experimental and numerical simulation results,the stress development process in joints of CFDST with through flange and the load on the bolts were analyzed.The influence of flange thickness,the number of through-stiffeners,stiffener height,and bolt specifications on the bending performance of the joint was analyzed,and recommended ranges for each parameter were suggested.Finally,considering the bending mechanical characteristics of joints of CFDST with through flange stiffeners,a design method for joints was proposed.