Research on mechanical properties of a new type of composite floor slab with split joint.

At present, the commonly used composite floor of steel bar truss in prefabricated buildings has the problem that the overhanging bent steel bars in the prefabricated floor collide with the reserved steel bars in other prefabricated components, which reduces the subsequent construction efficiency. In order to solve this problem, a new type of composite floor slab with split joints was designed. The bent steel bars are distributed centrally in the middle of the stitching edge of the prefabricated bottom plate, while the ends of the bottom plate are not reinforced, which reduces the contact with the reserved steel bars of other structures.This paper presents the mechanical properties of a new type of composite floor slab with split joint. Based on the loading test of full-scale specimens, finite element numerical simulation and theoretical calculation, the ultimate bearing capacity, elastoplastic properties, mechanical properties of reinforcement at the joints and other basic mechanical properties were investigated. The experiment results shown that the new type of composite floor slab with split joint exhibit better mechanical properties, and the structure of the laminated slabs can better guarantee the force transfer between the precast slabs. The theoretical, experimental, and finite element method (FEM) results are in good agreement, validating the reliability of the proposed composite floor slab design.The research content of this paper provides theoretical support for the application of the new composite floor slab in engineering practice, while its practical applications include improved construction efficiency, enhanced structural integrity, and crack resistance, making it a valuable solution for modern construction.