Reinforced concrete deep beam shear retrofitted with deep embedded bars: A numerical investigation. (2022)

• Record Type: Journal Article
• Authors: Dutta, Baisali; Nath Nayak, Amar; Nanda, Bharadwaj; Dirar, Samir
• Is Part Of: Materials today. Volume 60:Part 1(2022)
• Page Start: 281
• Page End: 287
• Publication Date: 2022
• Subjects: Deep embedded technique -- Finite element modelling -- Shear retrofitting -- Deep beam -- DE bar to exiting steel stirrups ratio; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.12.563
• Languages: English
• ISSNs: 2214-7853

Abstract

Highlights: A two-dimensional FE model is developed to study the structural behaviour of deep beam. This numerical beam is then reinforced with DE bars to investigate the effect of the DE bars on the structural behavior. The FE model is validated using experimental data from two different published literatures and good agreement is achieved between the test results, FE. A numerical parametric study is carried out to investigate the effect of DE bar to existing steel stirrups ratio on the shear behavior of DE GFRP and steel bar retrofitted deep beam. Abstract: A two-dimensional finite element (FE) model of a deep beam retrofitted with deep embedded (DE) bars is presented in this research. The proposed FE model was validated with published experimental results for the prediction of cracking patterns, failure modes, and load–deflection responses. Two non-retrofitted and one retrofitted deep beam selected from two published literature were modeled using VecTor2 software. One of the above beams is converted in to the shear deficient beam by reducing the shear reinforcement ratio. The beam is then shear strengthened with DE bars to investigate the effect of the DE bars on the structural behavior. Two types of DE bars, such as glass fiber reinforced polymer (GFRP) and steel bars, were considered in this study with the varying bars to stirrup ratios. All the shear deficient beams with above DE bars to stirrup ratios exhibited the characteristic diagonal crack spreading from the loading point to the support indicating shear failure of the beams. It was observed that the shear strength of the retrofitted beams with steel DE bars has shown the improvement in shear strength in the range 17.21%−29.66% over the control beam. Similarly, the shear strength of GFRP DE bars has improved by 21.57%-35.61% as compared to the control one.