Finite Element Analysis Of The Bonding Performance Between HB-FRP And Concrete

In recent years,FRP(fiber reinforced composite material)reinforcement technology has been widely used in the field of concrete reinforcement.Studies have found that the premature stripping of FRP and concrete in FRP-reinforced concrete structures leads to low FRP utilization.HB-FRP(Hybrid Bonding FRP,HB-FRP for short)technology can effectively delay FRP stripping and greatly improve the utilization rate of FRP.In this paper,based on the test data of existing HB-FRP single-shear specimens,the local bond-slip constitutive relationship between HB-FRP and concrete is given.Then,using this constitutive relationship,the finite element simulation of HB-FRP reinforced concrete single-shear specimens was carried out using ABAQUS software,and the ultimate bond load,bond load-slip curve and FRP of HB-FRP reinforced concrete single-shear specimens were obtained.The validity of the finite element model in this paper is verified by comparing the experimental value with the calculated value.Finally,using parameter analysis,the effects of the number of FRP pasting layers and the number of anchors on the ultimate bonding load of HB-FRP single-shear specimens are analyzed.In the process of using finite element calculations,it was found that proper simplification in the simulation calculation of the component can ensure the accuracy of the calculation and effectively save time.The main conclusions reached are:1.Compare the results of the finite element and the test,adopt the EB-FEP reinforced test piece,and the ratio of the limit load test value and the calculated value of the 1st,2nd,and 3rd layers are 0.98,0.93,and 0.90,respectively;use HB-FEP For the test piece of the reinforcement method,the ratio of the number of FRP layers pasted by one anchor to the first and second layers is 1.07 and 1.03,respectively.2.When the finite element method is used to analyze the EB-FRP reinforced specimen,the ultimate load of the specimen increases with the increase of the number of FRP pasted layers: the limit load of 2 layers of FRP is 1.43 times that of 1 layer,and 3 layers The limit load of FRP is 1.16 times that of pasting 2 layers.3.When the finite element method is used to analyze the EB-FRP reinforced specimen,the ultimate load of the specimen increases with the increase of the number of FRP layers: when the number of anchors is one,the ultimate load of 2 layers of FRP is 1.27 times of pasting 1 layer,the limit load of pasting 3 layers of FRP is 1.11 times of pasting 2 layers;when the number of pasting layers of FRP is 1 layer,the limit load of 2 anchors is 1.07 times of 1 anchor,3 The limit load of each anchor is 1.25 times that of 2 anchors,and the limit load of 4 anchors is 1.29 times that of 3 anchors.4.The ultimate load of the specimen reinforced with HB-FEP is increased by 1.91 ?3.72 times than that of EB-FRP,and the strain corresponding to each measuring point of FRP is significantly greater than the strain value of EB-FRP,indicating that HB-FRP reinforcement technology can be more effective To effectively improve FRP utilization.