Seismic behavior of assembled beam-column joints with C-shaped cantilever section

A kind of assembled steel beam-column joint with C-shaped cantilever section was proposed. The influences of the lengths of cantilever sections and cover plates on seismic performance of the joints were discussed through low-cycle reciprocating loading tests and numerical simulations. Then the sensitivity analysis of key parameters such as thickness and width of flange plate,bolt number and cover plate's length were carried out. The results show that the joint consumed energy through warping deformations of end plate and the friction slippages between flange of beam, C-shaped cantilever section and cover plate. By reasonably increasing the lengths of C-shaped cantilevers section and cover plates, it can ensure that the joints have high bearing capacities, while significantly improving energy dissipation capacities of the joints. Parameter analysis showed that increasing thickness of the flange plate can effectively improve the stress concentration at root of the cantilever section. Reducing width of flange plate has a great impact on bearing capacity and initial stiffness of the joint with the maximum drop amplitude of 13.1% and 18.9%, respectively. •A composite steel beam-column joint with a C-shaped cantilever section is proposed.•Through low-cycle reciprocating load tests,the seismic performance of the joint is discussed.•The sensitivity analysis of key parameters was carried out.•The failure mode, seismic performance and mechanical index of the specimen are recorded.•The design proposal of the joint with C-shaped cantilever section was put forward.