Abstract
Based on the full-scale model test of ordinary concrete two-way slab and recycled concrete two-way composite slab with beam column support, the failure mode, stiffness and deflection changes of ordinary concrete two-way slab and recycled concrete two-way composite slab under concentrated load are analyzed, and the similarities and differences of bending performance of the two components under the same conditions are proposed. The results show that: under concentrated load, the failure mode and deflection change trend of recycled concrete two-way composite slab are basically the same as that of ordinary concrete two-way cast-in-place slab. The deflection of recycled concrete two-way composite slab increases greatly after cracking, which is related to the secondary stress. The bending stiffness of recycled concrete two-way composite slab before cracking can be calculated according to the elastic theory.
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