Experimental Study And Finite Element Analysis On Mechanical Performance Of Multi-Span Column-supported Assembly Box Concrete Hollow Floor

Hollow concrete floor assembly box is a prefabricated assembly and in-situ reinforcedconcrete box girder composite ribs from the new box-section ribbed floor technology. Hollowconcrete floor assembly box empty box of concrete used to make the formation of a two-wayribbed plate-like, which makes the plate thickness of the concrete translation of the sameeffective height is greatly improved, thereby increasing the stiffness significantly reduces theamount of steel; This new floor technology has overcome many problems exist in the prior artsolutions, the use of good mechanical properties of the cavity plate, effectively reducingstorey structure and steel banding is simple, easy formwork, construction speed, can beapplied to a large cross, a large bay public buildings, commercial buildings, residentialbuildings, a wide range of beam and slab floor to replace the original structure, so theassembly box concrete hollow floor structure has great value, economic value, in the actualproject has also been widely used, due to the this structure is also not complete theoreticalsystem, designed to simplify the calculation of the lack of a reasonable, therefore, theassembly box concrete hollow floor in the actual project is limited. Although there have been anumber of scholars in the field of experimental and finite element analysis of concrete hollowfloor box assembly were studied, drawn by the terms of the force in the form of floorperformance, stiffness and bearing capacity calculation to calculate the conclusions, but forcolumn bearing assembly box concrete hollow floor structure forces in the vertical distributionof static loads less research, analysis of internal force of the floor structure of the theoreticalsystem needs further improvement, in order to assemble a wider concrete hollow floor in thebox practical engineering application, its internal force distribution under load research isimperative. Firstly, on a3×2cross-column support assembly box concrete hollow floor structurespecimens of the static load test, test specimens in three load cases on the section of thecontrol strain, and draw various conditions holder or cross-sectional strain distribution curve measuring point, the analysis of the strain distribution curve, according to the constitutive relation of concrete, has been supporting the assembly of hollow concrete floor distribution boxes across multiple columns under load stress. Then using a large general-purpose finite element analysis software ANSYS to establish a static load test of concrete hollow box column support assembly floor structure finite element model and static load test in accordance with three simulated loading conditions, various conditions calculated deflection column support assembly box concrete hollow floor, strain contours, and draw a distribution curve and static load test each section of the corresponding strain data based on various conditions of strain measurement points on floor ANSYS finite element model of computing, strain curve obtained through the stress distribution in the floor of the finite element model; Finally, conclusions and finite element analysis of static load test conclusions were analyzed to obtain the distribution of internal forces floor finite element analysis and experimental study of the static load basically consistent verify the validity of the theoretical analysis, correctness; obtained through further analysis of internal force distribution floorThrough this study obtained the following conclusions:(1) column support assembly box concrete hollow floor in-situ concrete prefabricated ribbed tank and be able to work together;(2) Due to the support column assembly box designed concrete hollow floor specimens in orthotropic plate tectonic districts grid, grid plate by Dutch district cloth under vertical loads are two directions in the plane of deflection and strain were different;(3) In the vertical loads, the internal force distribution across multiple column support assembly boxes and in-situ concrete hollow floor flat solid concrete slab without beam substantially similar internal force analysis of the floor structure can be floor cover simplified cross in the column strip and strip;(4) finite element analysis of the distribution of internal forces and floor Static Load Test of the basic agreement, has been supporting pillar box hollow concrete floor assembly districts in both directions along the grid plate holder, the middle section of the column plate across the board with tape and moment distribution ratio; and gives a moment distribution coefficient box concrete hollow floor assembly design method based on the direct analysis of internal forces.Through research on the column support assembly box above concrete hollow floor specimen analysis, we want to assemble boxes of concrete hollow floor design calculations and provide some data to support the theory reference.