Shear performance of RC beams strengthened via sustainable NSM-SHCC strips reinforced by high strength steel wires

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Alkhawaldeh, Ayah A., Ghalla, Mohamed, Elsamak, Galal, Badawi, Moataz, Mlybari, Ehab A. and Shaaban, Ibrahim ORCID: https://orcid.org/0000-0003-4051-341X (2025) Shear performance of RC beams strengthened via sustainable NSM-SHCC strips reinforced by high strength steel wires. Engineering Structures, 334. pp. 1-19.

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Abstract

This study investigates strengthening defective beams in shear using strain-hardening cementitious composites (SHCC) applied through the near-surface mounted (NSM) technique. It examines the risks of structural failure in elements and the use of sustainable construction materials. This technique includes embedding NSM-SHCC layers, reinforced with steel wires, onto the faces of the beams at different orientations: 30°, 45°, 60°, and 90°. Additionally, four and five strips oriented at 90° were examined with and without using an anchoring system. The study was developed in two modes, experimentally and numerically. The test findings are evaluated in terms of failure mode, load-deflection relationships, elastic stiffness index, and absorbed energy. Results revealed that a shear-defected beam strengthened using five NSM-SHCC strips at 90° with anchors succeeded in restoring the shear capacity and strength of the beam designed with sufficient shear reinforcement, with a shear capacity increase of 65 % compared to the shear-defective beam (DB). The shear capacity improvement for other beams was as follows: 11 % for DB-4–90, 19 % for DB-5–90, 40 % for DB-4–90-A, 65 % for DB-5–90-A, 21 % for DB-4–60, 52 % for DB-4–45, and 36 % for DB-4–30. Furthermore, the developed numerical models effectively estimated the ultimate load capacities and corresponding deflections for all beams, with differences between the numerical and experimental results ranging from 2 % to 6 %.

Item Type: Article
Identifier: 10.1016/j.engstruct.2025.120120
Keywords: RC beams, NSM SHCC, Shear, Strengthening, High strength steel wires, Failure risk mitigation, Construction materials
Subjects: Construction and engineering
Depositing User: Mary Blomley
Date Deposited: 25 Apr 2025 09:55
Last Modified: 25 Apr 2025 09:55
URI: https://repository.uwl.ac.uk/id/eprint/13495

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