Study On Mechanical Behavior Of Laminated Slab With Shear Connectors

At present, Reinforced concrete truss of laminated slab is widely used in the structure of the assembled shear wall in China. Compared with common slab, the amount of steel and concrete material and construction cost are greatly increased. To solve the above problems, A new type of laminated plate with shear connectors is presented, which can replace steel truss with shear connectors, so as to reduce the amount of reinforcement, reduce the thickness of the plate, and reduce the engineering cost.The concrete laminated slabs with shear connectors are made up of precast reinforced concrete floor, concrete shear connectors and the cast-in-place layer. The precast floor slab and the cast-in-place layer are connected with the shear connectors, and the shear force and the tension between the precast floor and the cast-in-place floor are made by the shear connectors. Shear connectors is made of reinforced concrete or plain concrete, the shear connectors is replaced by steel truss. Therefore, it can reduce the amount of steel and the thickness of the plate.Firstly, this paper is to study the failure characteristics, the shape of the shear connectors, and the layout of laminates slab under the equivalent uniform load. The experimental design of the three compared groups. In the first group, the influence of the structural form of the plate on the bearing capacity is studied. In the second group, the effect of the change of the arrangement of the arc resistance to the shear bond strength was studied. In the four plate, a plate is an anti shear connectors, and the other three plates are curved shear connectors laminated slab. In the third group, the influence of the change of the shape and structure of the shear bond on the bearing capacity of the structure is studied. In the third groups, the three plates are respectively, with the curved shear bond, a square shear bonded composite plate, a curved shear bond (with a built-in reinforcement cage). Test results show:The failure mode and failure process of the plates are the same, but the cracking load and the failure load of the plates are different. The structural form of the plate has a significant effect on the bearing capacity. The change of the distance between the small amplitude and the shear bond has little effect on the bearing capacity. The change in the shape and structure of the shear bond has a significant effect on the bearing capacity.Second, in order to study the integrity of the shear connectors and the precast floor, the whole of the precast floor slab and the cast-in-place floor. The layout displacement meter is in the prefabricated floor and the cast layer for relativing displacement measurement. The test results show that there is almost no relative displacement between the precast floor and the cast in place, and the whole is good.Finally, based on the finite element software ABAQUS, the finite element model of three sets of laminated slabs is established, The finite element simulation analysis of the stress process under the equivalent uniform load is carried out. The simulation results are verified by the experimental results. The results show that the stress process of the two tests is analyzed by finite element method. On this basis, the influence factors of bearing capacity and the development of cracks are analyzed.