Research On FRP-concrete Interface Performance Control System

Fiber reinforced polymer(FRP), with its light weight, high strength, corrosion resistance and other excellent characteristics of are widely applied in the field of reinforced concrete. Externally bonded FRP(EB-FRP) is one of the most popular method at present, the low utilization ratio and ductility due to premature FRP debonding is the significant shortcomings of the technology.In order to control the FRP debonding for improving the utilization ratio of FRP, the researchers took many method to control this kind of failure mode, Hybrid bonded FRP system(HB-FRP) method is considered to be the most effective. In the anchorage system,torque is the most important factors influencing the reinforcement effect. The torque plays a key role in controlling the mechanical properties of FRP-concrete interface. However, there is little research on this aspect.So this article design of single shear test under different torque for the optimized HB-FRP technology to research its control on the interface debonding effect.In addition, in view of the problem of poor ductility in EB-FRP reinforcement technology, this paper designed a new ductility end anchorage device, and further studied the device regulation effect of the interface.In view of the present HB-FRP anchor device has such problems as insufficient out-of-plane stiffness. This paper, by using ordinary shear bolt design principle to design the HB-FRP anchor device with stiffener.Design for 4, 5, 7, 9, 11 N.m five different torque single shear test of the impact of FRP-concrete interface, at the same time for the test result analysis of the failure model, load-slip curve, strain distribution, local shear stress distribution and local slip value and the bond-slip relationship.Ductility end anchorage device was designed and studied the effectiveness of the anchorage;6 kinds of anchorages-FRP were studied;To explore the influence of different bonding regional test on the reinforcement effect, ultimately determine the optimum bonding solution which can effectively prevent significantly unload;To study control effect of the FRP-concrete interface by using different deformation section width of end anchorage device. Then,put up with a design model of ultimate bearing capacity and key points of the load-slip curve are detailed analyzed.Also the paper has analyzed the local shear stress distribution, failure model, strain distribution, local slip value and the bond-slip relationship, including through the VIC-3D software export the strain distribution of color map for the whole failure process are analyzed in detail.