Abstract
This study presents a detailed experimental program for reinforced concrete T-beams strengthened in shear with near-surface mounted (NSM) basalt fiber-reinforced polymer (BFRP) bars. This paper aims to introduce and evaluate a nonmechanical anchorage technique for shear strengthening using NSM-BFRP bars. T-beams were strengthened using manually manufactured closed or U-shaped hybrid BFRP stirrups (BFRP bars and BFRP sheets). The experimental program was developed to study the effects of these anchorage techniques. The results showed that the shear capacity increased by 8%–46% for beams strengthened with NSM-BFRP bars without anchorage. However, the presence of the proposed anchorage system increased the shear capacity of the strengthened beams by 39.6%–81.6%. Moreover, the maximum strains induced in the BFRP bars ranged from 27 to 59% of their ultimate strains according to the spacing between the NSM and the presence of the anchorage. The proposed anchorage technique prevented the premature debonding of the NSM-BFRP bars.
Highlights
Fiber-reinforced polymer (FRP) systems have been used worldwide for almost the last three decades and are becoming a widely accepted method for strengthening concrete structure in shear and flexure (Diab et al 2009; Bilotta et al 2015; Chen et al 2018)
5 Conclusions This study reported an experimental program that investigated the behavior of reinforced concrete (RC) T-beams strengthened in shear with near-surface mounted (NSM)-basalt fiber-reinforced polymer (BFRP) bars
The contribution of the BFRP bars in shear strengthening was experimentally assessed with six T-section RC beams
Summary
Fiber-reinforced polymer (FRP) systems have been used worldwide for almost the last three decades and are becoming a widely accepted method for strengthening concrete structure in shear and flexure (Diab et al 2009; Bilotta et al 2015; Chen et al 2018). Various experimental studies have been performed to examine the shear strengthening of concrete members using external bonding (EB) FRP sheets/strips (Kalfat et al 2013; Shekarchi et al 2018). The use of near-surface mounted (NSM) fiber-reinforced polymer (FRP) bars is an attractive method for increasing the shear strength of shear-deficient reinforced concrete members. Basalt fiber-reinforced polymer (BFRP) composites have become commercially available at a low cost and may represent an alternative to GFRP (Wang et al 2017; Elmahdy and Verleysen 2020; Lebedev et al 2020). The experimental databases available in the literature for NSM of BFRP bars are very limited, and the current study presents a contribution to this database
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