Predictive modelling of shear strength in FRP-reinforced deep concrete beams: Fid-Bau Portal

Predictive modelling of shear strength in FRP-reinforced deep concrete beams

Zinkaah, Othman Hameed / Alridha, Zainab / Alhawat, Musab / Shanbara, Hayder Kamil

In the current paper, a comprehensive database comprising a total of 83 simply supported deep beams, strengthened using FRP reinforcement, was carefully collected from the literature. The collected data served as the foundation for an investigation into the Strut-and-Tie modelling (STM) provisions presented within three international codes, namely Canadian, ACI and European codes, in addition to other techniques (i.e., Tan et al. and upper bound) proposed by (Tan et al., Magazine of Concrete Research 55:53–63, 2003) and (Ashour, Journal of Structural Engineering 126:1045–1052, 2000) for simple deep beams strengthened by steel bars, respectively. The research involved modifying a rational technique to anticipate the load capacity of simple deep beams enhanced with FRP reinforcement. The developed technique was then employed to systematically investigate the effect of a wide range of parameters including longitudinal reinforcement, concrete compressive strength of concrete, shear span-to-depth ratio, and web reinforcement. The outcomes showed that the predictions of STM according to (ACI Committee 318M-14. (2014). Building code requirements for structural concrete and commentary. ACI, Farmington Hills, MI, p. 619), Eurocode 2 (EN 1992-1-1), the upper bound technique and Tan et al. model, exhibited an overestimation tendency, while conservative predictions were obtained through (CSA Standard S806. (2012). Design and construction of building components with fiber-reinforced polymers. Canadian Standards Association, Mississauga, Ontario, Canada, p. 208). In contrast, the modified model showed superior alignment with experimental results compared with other presented techniques. The parametric studies of suggested model parametric studies indicated that for deep beams have a/d ratios exceeding 1.0, vertical web reinforcement provided higher influences, whilst ratios below 1.0 are controlled by horizontal web reinforcement. Furthermore, the results highlighted that the effect of web reinforcement on ultimate load gradually diminished as longitudinal reinforcement increased.