Research on Tight Seam Stitching Technology for Bidirectional Composite Floor Slabs

A new type of tight seam stitching technology for bidirectional composite floor slabs is proposed in this paper. Full-scale tests on the construction of slab joints were carried out and contrasted with cast-in-place slabs. The mechanical properties of a new type of joint structure were studied, including the failure mode, bearing capacity, stiffness, and crack distribution of a floor slab. Based on these tests, a refined finite element analysis was performed, and then the mechanism of the force transfer between a steel bar and the concrete at the joint was deeply studied. The results show that the mechanical performance of the new joint of the tight seam stitching was essentially the same as that of the cast-in-place structure. The numerical calculation agreed well with the experimental results. A closed annular steel bar at a joint location could effectively transfer the structural internal force.