Analysis of Mechanical Properties of Long-Span Reinforced Concrete Composite Slabs Under Different Splicing Methods

Based on the long-span slab in an assembled building project, ABAQUS is used to simulate the mechanical properties and failure modes of the slab under the condition of the whole span cast-in-place slab and the two-way composite slab with different splicing methods. The finite element simulation results show that the integrate performance of the cast-in-place slab is better than the composite slabs, but the mechanical properties of the parallel splicing twoway composite slab are not different from the cast-in-place slab; The stress concentration and the first crack are easy to appear at the cast-in-place joint of the intermediate span composite slab. With the increase of the uniform load on the slabs, the cracks will develop from the later cast-in-place joint to the side span composite slabs, and the concrete at the bottom of the slabs will crack and fail; If truss reinforcement composite slabs are used for large-span slab, two-way composite slab shall be adopted. Cast-in-place joint shall be arranged in the direction with less stress but not be arranged bidirectionally.

Keywords:Large-span; Composite slab; Mechanical property; ABAQUS; Plastic damage