ABSTRACT
The mechanical characteristics of joints affect the mechanical behavior of the entire frame structure. The joint of special-shaped concrete-filled steel tubular (CFST) column and H-shaped steel beam joint has the advantages of high stiffness, high bearing capacity, avoiding column foot protrusion, and saving building space, and is widely used in buildings. Nine numerical models of the joints between L-shaped CFST columns and two H-shaped steel beams adjacent to the column were established, and the influence of steel tube thickness, concrete strength, and stiffener inside the column on the monotonic bending behavior of the joint was investigated. The results showed that the deformation and stress distribution of all specimens was symmetrical. The performance indexes of Beam 1 and Beam 2 of all specimens were essentially identical. The stiffness of joints can be improved by increasing steel tube thickness and equipping stiffeners inside steel tubes, while changing concrete strength has little effect on joint stiffness. The thinner the steel tube, the more concrete cracks developed. The distribution of longitudinal stress in the concrete section was affected by the thickness of the steel tube, concrete strength, and stiffeners.
