Prefabricated steel-concrete composite cross joints with concrete slab: Parameter analysis and theoretical study

Nowadays, many researchers are investigating prefabricated reinforced concrete composite structural systems due to their ability to achieve the double carbon goal, which aligns with the rapid development in the construction industry. This study proposes prefabricated steel-concrete composite joints with concrete slabs, termed prefabricated composite beam joints (PCBJs). Based on existing experiments, a three-dimensional solid model of PCBJs was developed using ABAQUS. From this model, the research evaluated the influence of axial compression ratio (n), floor slab width (w), floor thickness (t), and floor reinforcement ratio (rho) on the hysteretic behavior of PCBJs, then examined the suitability of the bearing capacity calculation methods from JGJ 138-2016 and ANSI/ AISC 360-16 for PCBJs. The results indicated that n and w significantly impact the hysteresis performance of PCBJs, whereas the influence of t and pis relatively small. When n exceeds 0.4, the larger the n, the worse the joint's plastic rotation ability. The calculation method for the flexural bearing capacity presented in the JGJ 1382016 and the ANSI/AISC 360-16 are highly conservative. The modified formula for determining the flexural bearing capacity of composite beams considers gravity's second-order effect. These calculation outcomes align closely with the FEM results.