Experimental And Analytical Studies On The Failure Mechanism Of HB-FRP Strengthened RC Beam With Notches

Fiber-Reinforced Polymer /Plastics（FRP）is widely used in the reinforcement and repair of building structures because of its light weight and high strength.In recent years,hybrid bonding FRP（HB-FRP）as a simple and efficient reinforcement method,gradually applied to FRP reinforcement defective reinforced concrete beam structure,compared with the traditional Externally-bonded FRP（EB-FRP）,the anchoring system in the HB-FRP reinforcement method can enhance the adhesion between FRP and the concrete matrix,giving full play to the tensile ability of FRP.And the mechanical properties of HB-FRP reinforced concrete beams can be further enhanced by applying prestress to the anchoring system.In order to explore the failure mechanism of HB-FRP reinforced concrete beams and the influence of different reinforcement schemes on the mechanical properties of reinforcement beams,two methods are used to study them,namely,testing and finite element simulation,as follows:（1）The mechanical properties and failure mechanism of HB-FRP reinforced concrete beam under four-point bending load were explored.The results show that compared with EB-FRP reinforced concrete beams,HB-FRP reinforced concrete beams exhibit better ultimate bearing capacity,ductility and stiffness.（2）In the test,the mechanical properties of the HB-FRP reinforced concrete beam after the reinforcement of three prestress values and the size of the two anchored steel plates were compared.The experimental results show that when the width of the anchored steel plate is 6cm and the prestress torque value is 20N·m,the mechanical performance of the reinforced beam is the best.（3）The failure process of the bending test of the carbon fiber board reinforced concrete beam was simulated by using finite element software.Among them,a cohesive element is used to simulate the interfacial nonlinear bond-slip relationship between the carbon fiber board and the concrete beam matrix.The simulation results are closer to the experimental results,indicating that the proposed finite element model can accurately predict the bending resistance of carbon fiberboard reinforced concrete beams.Figure [53] Table [8] Reference [55]...