Flexural Behavior of Tightly Spliced Concrete Composite Slabs with Diagonal Reinforcement.

To improve load transfer performance at the joints of standardized closely spaced concrete composite slabs, this study proposes two novel composite slab designs: the bent diagonal-reinforced tightly spliced slab and the ribbed diagonal-reinforced tightly spliced slab. The flexural behavior of these two types of inclined reinforcement closely spaced composite slabs was investigated through static loading tests and ABAQUS finite element simulations. The results indicate that both slab types exhibit excellent synergy between the precast base slab and the composite layer under load, achieving bending capacities at the joint sections comparable to those of cast-in-place slabs. Based on the finite element analysis, design recommendations for the Ribbed Diagonal-Reinforced Tightly Spliced Slab are provided, offering a practical reference for large-scale engineering applications.