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