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A novel composite joint with corrugated web and cover plates for simultaneously improving anti‑collapse resistance and seismic behavior

Wang Jing-Xuan, Wang Wen-Qi, Gao Shan

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e77, 2023

This paper presents a numerical study on the progressive collapse response of concrete-filled steel tube (CFST) composite joint. A novel beam-column connection by using corrugated web and cover plate is proposed to enhance the collapse resistance of the joint. The simulated response is evaluated in terms of the ultimate load and deformation capacity of the joints for column removal scenario and cyclic loading. The results indicate that the corrugated web and cover plates connection can effectively delay the local buckling and fracture of the steel beam. Those configuration details have a significantly positive effect on the development of internal force, especially in the catenary mechanism stage to provide tensile force. Moreover, only after the fracture of the bottom fange, the corrugated web of the beam begins to contribute to the anti-collapse capacity of the joint. Compared with the CFST column-steel beam joint with fat beam web, the anti-collapse capacity and the vertical displacement of the joint are increased by 75.9% and 92.8%, respectively. Furthermore, a simplifed calculation method for the anti-collapse capacity of the joint is proposed according to the resistance mechanism analysis. In addition, the seismic evaluation of the novel joint based on anti-collapse design indicates that the novel connection details can signifcantly improve the collapse resistance of the joint, without impairing its seismic resistance.