Numerical Simulation Of ABAQUS Of Shear Behavior Of Pre-Damage Reinforced Concrete Deep Beam Strengthened With BFRP Sheet

With the development of the society and investing in civil construction, a lots of housing, bridge and other industries developed quickly. Many problems appeared with economic development, such as building in using period meet different degrees of damage, reconstruction would instead by repairing in consideration of economy and environmental effect. How to repair those constructions to be security has become a current research issue for many researchers. The fiber reinforced polymer materials(FRP) has become a new trend in the industry of reinforcement and been widely used in civil engineering, but still lack of relative researching, a lot of theory and investigation need to be completed.This paper will investigate the shear performance of 6 reinforced concrete beams strengthened with BFRP sheet by experiment and finite element numerical simulation methods. The test beams are divided into shear-span ratio of 0.76 and shear-span ratio of 1.24 two groups, each group is divided into enclosed type, U-shaped type, U-shaped and pressure layer three methods,6 models of test beams are build up by ABAQUS finite element numerical simulation. Ultimate bearing capacity value, deflection, stress cloud and cracking cloud drawings were fond according to displacement loading method and compared with the experimental data. The experiment and numerical simulation results indicate that:(1) Through the validation of test data and numerical simulation results, ultimate bearing capacity of reinforcement deep beams strengthened with BFRP sheet has obviously improved and the maximum deflection value decreased compared with RC beam.(2) Through the validation of test data and numerical simulation results, Compared the beams of shear-span ratio of 1.24 with the beams of shear-span ratio of 0.76 in same strengthen method, ultimate bearing capacity was significantly higher in bigger shear-span ratio beam. It is indicated that the size of the shear-span ratio will directly affect the effect of BFRP strengthen performance and bigger shear-span ratio beams show better performance.(3) Through the validation of test data and numerical simulation results, under the condition of the same shear-span ratio, the effect of three strengthened methods are different, the effect of enclosed type of BFRP strengthen is best and the ultimate bearing capacity was improved most. Followed by U-shaped and pressure layer type, the effect of U-shape type strengthen method was the least.(4) The stress cloud and cracking cloud drawings of damaged concrete beams strengthened with BFRP sheet by finite element numerical simulation were similar to test data, the maximum deflection value and the value of ultimate bearing capacity of finite element numerical simulation are in good agreement with the test data. Finite element numerical simulation validate the accuracy of experimental result and also has once again prove that the shear performance could improved by strengthening with BFRP sheet. But there are still some problems in the numerical simulation could affect the precision of the simulation, such as consideration of bond-slip of steel, micro-cracking in concrete, stiffness degradation of concrete in numerical simulation.