To study the influence of the mechanical performance of a unidirectional through precast concrete slab,a group of 3 unidirectional through precast slab specimens were designed to compare the bending perform-ance with that of cast-in-place slabs.By investigating the characteristics of the slab failure form,mid-span de-flection change,stress change of the reinforcement in the slab,and strain change of the concrete at the bottom of the slab,the following conclusions were drawn:No obvious brittle failure was observed during the test,and the bending resistance of each test plate was good.The crack development of the test slab shewed that the me-chanical performance of the precast wood fiber concrete slab was similar to that of cast-in-place solid slab,and the crack distribution was more uniform.The smaller the cavity size,the better the bending performance of the fully prefabricated plate was with the same penetrating type.The ultimate bearing capacity of all cavity plates was higher than core plate,and the ultimate bearing capacity of core plate was increased by about 46.1％.Compared with the prefabricated slab,the strain of reinforcement bar and concrete at the bottom of solid slab under the same load was larger,and the curve of load-tension strain at the bottom of slab turned more obviously.The ultimate compressive strain of the full prefabricated plate was between 2000～3000 microstrain,and the sol-id plate was between 1000～1500 microstrain.
Prefabricated structureBending resistanceFull precast slabCavity floorOne-way through
维普
万方数据
