Study On Flexural Stiffness Of Splicing Superimposed Slabs

With the high-speed development of housing industrialization, assembled monolithic structure has been widely used in civil construction in our country It has many advantages comparing with the site casting,such as the construction being convenient, saving template, shortening the construction period, low cost, etc.In order to study the bending properties of two plates of stitching laminated spliced composite slab, we compared them by producing the same material of concrete, reinforcement ratio and size of slab and the cast-in-place board. We gained the deflection and bending stiffness of the two different slabs and compared the test data of stitching laminate floor with that of cast-in-place board through the static experiment of the two floor. The results shows that the splicing laminated floor can be designed as two-way slab by taking construction measures.We use the general purpose finite element programe ANSYS to analysis the flexural stiffness of splicing supermposed slabs.The software of MATLAB is used to calculate calculate the deflection of reinforced concrete slab, which shows that the deformation and the rigidity of cast-in-place reinforced concrete slab and splicing laminated floor concrete slab are basically consistent in elastic stage.This shows that the splicing superimposed slabs has excellent bending performance,the reiforced concrete slab of the double composite plate is standardized producted in the factories, in the actual project site or experiment has a flat-fell seam problem and flat-fell seam connecting bar problem, while the height and width of flat-fell seam, and connecting steel structure form, as well as the connecting bar spacing, the length will effect the the flexural stiffness of reinforced concrete composite plate produce. In this paper, the third chapter mainly uses the ANSYS finite element software to different flat-fell seam height and width of double composite board simulation analysis, It is concluded that the middle of the span deflection under different load cases, and according to the inverse calculation of elastic mechanics knowledge its bending stiffness, the fourth chapter mainly uses the ANSYS finite element software of connection reinforced under the different length and spacing of double reinforced concrete superimposed slab the middle of the span deflection is analyzed and calculated by the bending stiffness.Through the experimental research and ANSYS finite element analysis it shows that the seam height, length and spacing of transverse connection of reinforced are the main factors which influences the reinforced concrete laminates’ bending stiffness, while flat-fell seam width and spacing of double vertical reinforcing steel bar bending stiffness of the composite plate less affected. With the increase of flat-fell seam high, flexural stiffness of reinforced concrete composite plate decreases more, and in the case of the same height, with the increase of flat-fell seam width double composite plate bending stiffness not decrease much, relative to the decrease of the vertical bar spacing, and with the increase of transverse reinforcement length and transverse reinforcement spacing, the stiffness of reinforced concrete composite plate increases the size of the larger, and relative to the increase of transverse reinforcement length decreasing transverse reinforcement spacing of the reinforced concrete composite plate stiffness increase more effective.