Fundamental Study on Bond and Splice Behaviour of a GFRP Repairing System for Damaged GFRP Members

摘要

Fibre Reinforced Polymers, FRPs have high specific strength and corrosion resistance compared with conventional construction materials such as steel and concrete, and in recent years they have been used as not only repairing materials but also primary structural members of civil infrastructures such as hydraulic gates, bridge inspection platforms and footbridges. Under these circumstances, in order to maintain FRP structural members for longer use, it is very important to develop a proper repair method when damage or deterioration such as fibre breakage or ultraviolet deterioration occurs. Up to now there is no FRP collapse due to such damages; however, the strength of FRP depends on structural integrity of fibre. Therefore, examined in this study is the repairing technique of GFRP member damaged by fibre breakage. At first, tensile test and Finite Element Analysis, are carried out using repaired specimens by GFRP splices bonded to both sides of GFRP plate having fibre breakages. In the experiment, the type of adhesive and the length of splices are varied. It is verified that the tensile strength could be recovered as the tensile stress was transferred through the splices. Secondly, the stress distribution characteristics of GFRP splices are assessed by comparing the experimental results with the theoretical stress transfer of laminated GFRP lap connection and its FE analysis results.