Experimental Research On Flexural Behavior Of Steel Reinforced Concrete Slabs Combination Strengthened With Enlarging Section And Gluing Steel Plates

The paper is based on the experiment of flexural strengthening for eight reinforced concrete plates,the size is 2000×500×100 mm~3,and discussed the plate from the preliminary composite reinforcement ultimate flexural strength,flexural rigidity,deflection and crack development in section enlargement and bonding steel reinforced concrete composite slab reinforcement effect;analysis of laminated concrete in the same thickness and strength of laminated steel plate and carbon fiber cloth,the equivalent conditions of two kinds of composite reinforcement reinforcement method of reinforcement effect,and analysis of the data of test,the main research contents are as follows:First,the flexural behavior of steel reinforced concrete slabs combination strengthened with enlarging section and gluing steel plates were tested,the cracking load,the reinforced concrete plate yield load and ultimate load data of steel and carbon fiber cloth reinforcement effect of equivalent conditions were analyzed,for the future the increasing section composite with steel bonded reinforcement method is applied to practical engineering to provide technical solutions and reference.Second,the influence of the reinforced concrete slab on the crack growth,the deflection and the failure mode of the reinforced concrete slab with the increase of the cross section and the bonding steel is studied,and discuss the composite reinforcement plate stiffness change,etc.Third,according to the stress-strain relationship of concrete,steel bar and steel plate in the test,the results show that the deformation of the composite plate is in accord with the results of the plane section assumption.Fourth,based on the finite element software ANSYS,considering the nonlinear concrete and steel plate effect,establish the finite element model of the composite reinforcement plate,composite reinforcement plate force performance using finite element simulation analysis and comparison of finite element simulation value and test value.Fifth,based on the the relevant calculation principle of the concrete structure design code and strengthening concrete structure design code and test,this paper has developed the corresponding simplified calculation method for the ultimate flexural capacity.