End-Anchored Externally Bonded BFRP Composites for Shear Strengthening of RC T-Beams

Abstract

This experimental study explores the behavior of shear-deficient reinforced concrete (RC) T-beams that are strengthened with externally bonded basalt fiber-reinforced polymer (EB-BFRP) composites. The primary aim of this study is to investigate the influence of various types of end-anchorage schemes on the efficacy of BFRP U-jackets. Six different anchorage schemes have been considered, varying in terms of their location and constitutive materials. Additionally, other investigative parameters include the types of strengthening schemes and the orientation of the BFRP composites. Ten RC T-beams were prepared and tested under a four-point loading system. The experimental outcomes showed that the load-carrying capacity of T-beams with EB-BFRP increased by 18–88%, and the end-anchorage schemes enhanced the performance of BFRP U-jackets by 12–44%. The rope-anchorage system located at the web-flange junction was the most effective, followed by the mechanical anchorage system, with the anchorage system comprising horizontal BFRP strips being the least effective. Finally, the test results were compared with the estimations made by ten widely considered design guidelines, revealing that the latter provided more conservative results.