نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Flexural strengthening of reinforced concrete (RC) structures using fiber-reinforced polymers (FRP) is recognized as one of the most effective methods for structural rehabilitation and performance enhancement. However, the occurrence of premature failures—such as debonding of the FRP sheet from the concrete surface and concrete cover delamination (CCD) from the tensile face of the strengthened member—prevents full utilization of the FRP capaci-ty. In this study, an experimental program consisting of 12 RC beams under four-point bending was carried out to evaluate the effectiveness of the Bar-Anchor-Fiber (BAF) technique in controlling CCD and improving flexural behavior. The specimens were divided into four main groups: control beams (REF), beams strengthened using the grooving methods such as externally bonded reinforcement on grooves (EBROG), beams strengthened with near-surface mounted (NSM) FRP without anchorage (NU), and NSM beams strengthened using the BAF method with bar lengths of 115, 150, and 200 cm (NA115, NA150, NA200). The results showed that the BAF technique completely eliminated CCD and significantly increased both the ultimate load-carrying capacity and the ductility of the beams. Moreover, increasing the anchorage length improved the perfor-mance of the Bar-Anchor-Fiber system in terms of flexural capacity and ul-timate deformation, with the NA200 beams exhibiting the highest perfor-mance. Accordingly, it can be concluded that the end-anchorage system in HMFRP bars, as well as the bar length in the BAF configuration, plays a decisive role in fully exploiting the capacity of CFRP.
کلیدواژهها [English]
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