Publication: Experimental and theoretical investigations of shear strength and repair of high-strength concrete deep beams using near-surface mounted gfrp rebars
| datacite.subject.fos | oecd::Engineering and technology::Civil engineering | |
| dc.contributor.author | Azhar Ayad, Jaafar Farajallah | |
| dc.date.accessioned | 2025-11-27T21:33:47Z | |
| dc.date.available | 2025-11-27T21:33:47Z | |
| dc.date.issued | 2024-09-01 | |
| dc.description.abstract | Shear failure in reinforced concrete (RC) deep beams is a critical structural concern. There has been a rapid adoption of glass fiber-reinforced polymer (GFRP) sheets and bars for reinforcing structural concrete elements, including deep beams. This study investigated the behavior of RC deep beams strengthened and repaired using near-surface mounted (NSM) GFRP bars. Four groups of deep beams—G1, G2, G3, and G4—were examined, each with a shear span to effective depth ratio of 1.26. These groups included deep beams that were either strengthened or pre-crack repaired using various NSM GFRP bar arrangements and orientations. The study utilized two types of concrete: normal high-strength concrete (NHSC) and high strength concrete with special additives (SHSC). The NSM GFRP bars were oriented at either 0°/90° or 45°/135° with a spacing of 150 mm. Ten RC deep beams, each measuring 400 x 150 x 1700 mm, were tested. The experimental results were validated using the finite element software ABAQUS V.20, with simulations conducted using standard mechanical properties (SMP) and core mechanical properties (CMP). Results showed that NHSC and SHSC RC deep beams strengthened or repaired with NSM GFRP bars experienced a 12% to 22.5% increase in shear capacity compared to control specimens. The ACI standard model aligned well with the experimental results. Additionally, two modified empirical equations were proposed to calculate the shear capacity contribution (𝑉𝑓) of NSM GFRP bars in NHSC and SHSC RC deep beams, using different effective strain values. According to the experimental results, the enhancements in shear strength for Groups G1 & G3 and G2 & G4 ranged from 13.3% to 22.5%, 15.5% to 20.4%, 12% to 18.25% and 12% to 16.3%, respectively. In contrast, the numerical simulation results of the FE models compared to the experimental results showed an increase in maximum shear strength ranging from 2-3% for Groups G1 & G3 and 3-4% for Groups G2 & G4. Additionally, two empirical equations have been proposed with the effective strain values used for Groups G1 and G3 with NHSC were 0.0050 and 0.0038, respectively. For Groups G2 and G4 related to SHSC, the values 0.0061 and 0.0042 were employed, respectively. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/23270 | |
| dc.language.iso | en | |
| dc.title | Experimental and theoretical investigations of shear strength and repair of high-strength concrete deep beams using near-surface mounted gfrp rebars | |
| dc.type | Resource Types::text::thesis::doctoral thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |