Shear capacity analysis of prefabricated concrete column-steel beam joints connected by tie-bars

To improve the seismic performance and shear capacity of joints between steel beams and reinforced concrete columns (RCSs), this paper proposes prefabricated concrete column-steel beam joints connected by tie bars. Five joint members were designed and fabricated for the proposed static tests, and the damage pattern, hysteresis performance, and load-carrying capacity of each specimen were investigated, with the diameter of the tensile reinforcement and the relative position of the tensile reinforcement and the flange of the steel beam as the main parameters. The test results show that the hysteresis curve shape of each specimen is fuller, the ductility coefficient is between 3.30 and 4.62, and the joints have a good capacity for plastic deformation. The bearing capacity of the joints increased as the diameter of the tie bars increased; the bearing capacity and elasticity of the joints decreased when the tie bars were arranged inside the steel beam flange. In this paper, three existing shear capacity calculation methods for RCS joints are compared and evaluated, and combined with the experimental results, a finite element calculation model for this kind of joint specimen is established and a shear capacity calculation formula for prefabricated concrete column-tension reinforcement connection joints is proposed. The new calculation method agrees with the test values and can be used to design tension reinforcement connection joints for practical engineering applications.