Experimental Study And Numerical Simulation Of Prestressed Lightweight Aggregate Concrete Composite Board

The concrete composite structure has the merits of cast-in-site structure and assemble structure. But, due to its prefab and casting part both made of common concrete, this structure has some disadvantages, such as high deadweight, difficult hoist etc. In order to solve the above problems, the prefab part is made of lightweight concrete, the casting part is still made of common concrete, and then we bring forward the new type combined slab. The advanced combined slab makes full use of the lightweight and large-span merits of lightweight aggregate concrete slabs, still makes full use of the resistive pressure merit of the common concrete, and reserves the characteristics of common concrete composite slab.In order to study the mechanical capability of the combined slab, this paper mainly develops the following tasks: fist, carries through the making in tow-stage and loading in two-stage experiment of the combined slab; second, simulates the combined slab with ABAQUS, in the course of simulation, using the ABAQUS/Pre, ABAQUS/Standard and ABAQUS/Post modules, the concrete using smeared crack model, the rebar using double curves elastic-plastic model, the bond-slip between rebar and concrete using coupling cell which is content with Houde formulation, the bond-slip between new concrete and old concrete using ideal elastic-plastic spring and contact surface which is content with Coulomb, initial stress using Initial Conditions, initial stress field parameter using TYPE=STRESS, in addition, in order to exactly simulate the making in tow-stage and loading in two-stage of the combined slab, uses alive-dead cell; finally, with the above method and model, progresses simulative experiment of the combined slab based on ABAQUS. Through the above study, this paper acquires the following conclusions:1. The composite surface of the combined slab well bonds, which verifies that the combined slab has good integer capability;2. The stress in tensile steel of the combined slab exceeds;3. The strain in the compressed concrete of the compressed concrete falls behind;4. Due to the making in tow-stage and loading in two-stage of the combined slab, the compressed concrete of the pre-stress slab has formed pre-compressed field before the second stage, at the same time, the tensile concrete has formed pre-tension stress , that is to say, there is "loading pre-stress" in the combined slab;5. The experimental results agree with simulative results, which testifies that the calculating method and the finite element model is proper;6. The alteration of h1/h has significant impaction on the combined slab.