Title:
Developed Approach for Shear Modeling of ETS-FRP-Strengthened RC Beams (Prepublished)
Author(s):
Linh Van Hong Bui, Hidehiko Sekiya, Boonchai Stitmannaithum
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
analytical model; embedded through-section (ETS); fiber-reinforced polymer (FRP); flexural-shear deformation theory (FSDT); reinforced concrete beams; shear strengthening
DOI:
10.14359/51746674
Date:
3/17/2025
Abstract:
There is a need to model the complete responses of shear-critical beams strengthened with embedded through-section (ETS) fiber-reinforced polymer (FRP) bars. Here, a strategy is proposed to integrate two separate approaches, flexural‒shear deformation theory (FSDT) for element fields and a bonding-based method for ETS strengthening, into a comprehensive computation algorithm through localized behavior at the main diagonal crack. The use of force- and stress-based solutions in the algorithm that couple fixed and updated shear crack angle conditions for analyzing the shear resistance of ETS bars is investigated. The primary benefit of the proposed approach compared to single FSDT or existing models is that member performance is estimated in both the pre-peak and post-peak loading regimes in terms of load, deflection, strain, and cracking characteristics. All equations in the developed model are transparent, based on mechanics, and supported by validated empirical expressions. The rationale and precision of the proposed model are comprehensively verified based on the results obtained for 46 datasets. Extensive investigation of the different bond‒slip and concrete tension laws strengthens the insightfulness and effectiveness of the model.