Research on Static and Seismic Performance of Joints Between Steel Beams and Prefabricated Reinforced Concrete Columns

A novel type of joint between steel beam and reinforced concrete column was proposed. The joint connected steel beam with prefabricated concrete column through the joint ring composed of square steel tube and ribbed plates. The inner ribbed plates of joint can be integral and separated. The static and seismic ferformance of joint with through-type ribbed plates and joint with separated-type ribbed plates were studied by monotonic and cyclic loading tests on full-scale specimens, and the corresponding ABAQUS finite element simulation was carried out. It was shown that under the monotonic loading, the failure mode of joint with through-type ribbed plates is the tension cracks at the welds of the tension flange of steel beam and square steel tube, and the joint with separated-type ribbed plates was local bucking appeared in the compression flange of steel beam and the plastic hinge formed. Compared with the joint with though-type ribbed plates, the displacement ductility ratio and bearing capacity of the joint with separated-type ribbed plates were increased by 38.24% and 22.33%, the ductility and bearing capacity were better. The failure modes of two joints under the cyclic loading both were the failure of the concrete crushed in the interior part of joint. The stiffness degradation of the joints was stable. The displacement ductility ratio and the energy dissipation coefficient of the joint with separated-type ribbed plates were increased by 21.76% and 35.05%, the ductility and energy dissipating capacity were better. The finite element models could accurately simulate the static behavior of joint under monotonic load, as well as the seismic performance under cyclic load.