Load-Bearing Capacity of Bended FRP Reinforcement with Various Anchorage Lengths

Abstract

The research builds upon the analysis of bent glass-fibre-reinforced-polymer reinforcement. The presented work focuses on examining the influence of anchor length on the overall tensile strength of bent FRP rebar. In general, to ensure secure anchoring of the reinforcement in concrete, it is necessary to determine a specific length of the straight section of the rebar beyond the bend, which prevents the reinforcement from being pulled out of the concrete. A total of 27 pieces of bent rebar were tested in the research and divided into four subgroups based on the anchor length beyond the bend. The reference value of the load-carrying capacity of the straight reinforcement was tested on four experimental samples. The research results confirmed that the reduction in tensile strength depends on the anchor length and suggest that the minimum anchorage length stated in the literature should be sufficient; exceeding it does not lead to a significant increase in the load-carrying capacity of the rebar. The research findings expand the Czech Republic’s design knowledge of FRP reinforcement and facilitate the resolution of subsequent phases of the project.