Research On Mechanical Properties Of New-type Wall-floor Slab Joint In Precast Structure

In recent years,precast concrete building is a new building method which is being vigorously promoted by the state,but at this stage,the level of assembly can not reach the level of full prefabricated assembly.Among them,the connection between shear wall and floor slab mainly adopts precast floor and joint post-pouring.This method will greatly reduce the assembly rate.When the earthquake occurs,the anti-lateral force components with different stiffness need to coordinate and transmit the seismic action through the floor slab.Therefore,whether the connection between the floor and the sheer wall is reliable which is the key to whether the floor can give full play to its coordination and transmission capacity.If the joints of floor slab and shear wall are assembled by full prefabrication,there will be a large number of precasted slab slots in the joints,so whether they can transmit force well through the joints becomes an important problem to be solved.In this paper,a new-type of assembled wall slab joint is proposed.The solid model of assembled slab is established by using the large-scale general finite element analysis software ABAQUS,and its non-linear finite element numerical simulation is carried out.The important factors affecting its performance are analyzed and compared with the traditional integral cast-in-place slab.The main contents of this paper are as follows:(1)On the basis of consulting and analyzing the existing precasted of wall-floor slab joints,a new type of precasted of wall-floor slab joints is proposed,which is different from the existing precasted of wall-floor slab joints(2)The new type joints and traditional integral cast-in-situ wall-floor slab joints of the same size were numerically simulated by using ABAQUS,a large-scale general finite element software,and their mechanical properties such as carrying capacity were systematically studied.(3)The differences in mechanical properties such as load-bearing capacity between the new type ofprecased wall-floor slab joints and the integral cast-in-situ wall-floor slabjoints are compared and analyzed.At the same time,the differences in mechanical properties such as the influence of prestressing force on the carrying capacity of the new type of assembled wall-floor slab joints are analyzed.