| The protecting, examination and maintain to the existing structure is theconcern and research focus to the engineer all of the world. In virtue of the advantages of fiber-reinforced plastic/polymer (FRP), light-weight, high-strength, nice environmental and fatigue resistibility, it has been broadly used in structural strengthening in many countries. The bond behavior between FRP and concrete is the precondition of the load transfer and working together. And it is also an important research topic of the concrete structure strengthened with externally bonded FRPs.In this paper, the effect of the supported height, bond length, thickness and plate width of the FRP on the bond behavior between FRP and concrete are got based on a finite element analysis on the FRP-to-concrete single shear joint. At the same time, some discussions are made on the plate width coefficient and effective bond length in Chen-Teng's bond strength formula, leading to useful conclusions for further investigation on the bond strength. First, though the linear elastic finite element analysis, an overall and thorough analysis is taken to the stress components of the FRP-to-concrete joint. Second, the nonlinear analysis is taken to the maximum load of the FRP-to-concrete joint. Following conclusions are drawn from this study: (1) The effect of above factors are significant on the bond behavior of the FRP-concrete joint; (2) With the increase of the FRP plate width, the stress gradually approaches to uniform across the width. It is advantageous to transfer of the stress; (3) When the plate to concrete width ratio is larger, it is easy to fail by the concrete tension-shear failure; (4) The plate width coefficient in the Chen-Teng's bond strength formula is too small and conservative when the concrete tension -shear failure occur; (5) When bond length 1.5L_e≤L<2L_e (L_e is the effective bond length), the bond strength is increasedagain, but at the L = 2L_e, it is descend close to that of L_e. |
