Finite Element Analysis Of Strengthening The Strengthened Reinforced Concrete Beam With FRP

In order to meet the requirements of the safety and the use function of existing reinforced concrete structures, its reinforcement technology has been widely concerned. The strengthened reinforced concrete structures with FRP are the more widely used in the actual reinforcement engineering because of its convenience,safe,and efficiency. It has become a growing focus of attention and research about the issues of secondary load,fiber reinforced polymer-to-concrete bond -slip model and ultimate behavior after the reinforcement. In this paper ,the bearing performance for the strengthened reinforced concrete beam with fiber reinforce polymer is studied by the finite element and theoretical analysis methods, and based on the fiber and concrete bond-slip relationship, the influence of FRP layers and reinforcement ratio are discussed, the content is as follows:1. The lagging strain calculation methods of the strengthened reinforced concrete beam with FRP are summarized. Under the secondary load, the calculation formula of the strengthened reinforced concrete beam in different codes of foreign countries are compared and analyzed, and simple calculation program of FRP lagging strain is given.2. Considering the influence of the secondary stress, numerical simulation the whole process of the strengthened reinforced concrete beam with FRP, analysis shows that, initial bending moment reduces the yield bearing capacity and ultimate bearing capacity of reinforced beam, the finite element analysis ANSYS result and the experimental result are more consistent.3. Based on the fiber and concrete bond-slip relationship, considering the influence of the FRP layers and reinforcement ratio, the mechanical property of the strengthened reinforced concrete beam with FRP is simulated and analyzed by nonlinear finite element method,the optimal bonding layer of FRP is given; reinforced beam's supporting capacity to increase along with the textile fiber cloth layer increase, but it is not linear increase; When glues the same layer textile fiber cloth,the lower reinforcement ratio, the more efficient textile fiber cloth, the bearing capacity of reinforced beam is improved greatly.