Experimental Study of Laminated Slabs Connected with Bending Bars and Additional Bars in the Prefabricated Layer
One cast-in-situ slab and four laminated slabs were tested to investigate the influences of the U-shaped bars and the bending height of the prefabricated floor bars in the laminated slabs.The crack development,failure mode,deflection,bearing capacity and steel strain of the test slabs were comparatively analyzed.The results indicate that the bearing capacity and deformation capacity of the laminated slabs with U-shaped bars are similar to those of the cast-in-situ slab,and dowel effects of the U-shaped bars limit the development of cracks along the laminated slope.After cracks appear at the root of the laminated area with 90° bending bars at the bottom of the prefabricated layer,the crack develops quickly along the laminated slope as the load increases,and the unfavorable position appears at the laminated slope,leading to the decrease of the bearing capacity and stiffness of the laminated slabs.The 90° bending bars at the laminated slope position reach the yield strength when the slabs fail,indicating that the bending design schemes in the bottom plate steel bars can make full utilization of the steel bars.Finally,design suggestions are given for the laminated slabs with 90° bending bars in the bottom of the prefabricated layer.
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