Retrofitting of Box Section Concrete Beams to Resist Shear and Torsion Using Near-Surface-Mount (NSM) GFRP Stirrups

Ahmed Mahmoud; Moaz Nasser; Tarek Mostafa; Ahmed Khater

doi:10.3221/IGF-ESIS.67.23

Retrofitting of Box Section Concrete Beams to Resist Shear and Torsion Using Near-Surface-Mount (NSM) GFRP Stirrups

Authors

Ahmed Mahmoud Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt.
Moaz A. Nasser Civil Engineering Department, High Institute for Engineering Technology, 21K Cairo-Belbies Rd., Al-Obour, Egypt https://orcid.org/0009-0002-3014-4278
Tarek S. Mostafa Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt. https://orcid.org/0000-0003-1327-8143
Ahmed N. Khater Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt. https://orcid.org/0000-0003-4528-8979

DOI:

https://doi.org/10.3221/IGF-ESIS.67.23

Keywords:

Experimental, Analytical, Reinforced concrete box section beams, Near-surface mount (NSM), Retrofitting, Shear and torsion, glass- fiber-reinforced polymer (GFRP)

Abstract

There are a few kinds of research about box section Reinforced Concrete (RC) beams under the effect of combined shear and torsional stresses. In the present research, the concept of adding external strengthening, in the transverse direction, is adopted. The paper focuses on using Glass Fiber Reinforced Polymer GFRP ropes as near-surface mount stirrups. Nine box-section concrete specimens were decanted and tested. Three variables are adopted, (1) GFRP stirrups diameter, (2) GFRP stirrups inclination, and (3) GFRP stirrups spacing. The experimental results showed considerable enhancement in the shear capacity of the strengthened beams by 8 to 56% depending on the effectiveness of the studied parameters. Ductility and toughness were improved when more intensive strengthening schemes were adopted. The shear capacity of all tested beams based on Egyptian code ECP 208–2019 is calculated and compared with that from American code ACI 440–2019 and Canadian code CSA-A23.3-04. The shear capacity from both Egyptian and American codes compared with experimental loads. The analytical results are conservative in some cases and unconservative in others while the analytical results in general are conservative. The Canadian code CSA-A23.3-04 is unconservative compared to the experimental results for the range of the studied parameters and specimens.

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Author Biographies

Moaz A. Nasser , Civil Engineering Department, High Institute for Engineering Technology, 21K Cairo-Belbies Rd., Al-Obour, Egypt

Assistant Lecture, Civil Department, High Institute for Engineering Technology, 21K Cairo- Belbies Rd., Al-Obour, Egypt. Ph.D.
Tarek S. Mostafa , Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt.

Associate Professor, Civil Engineering Department, Faculty of Engineering (Shoubra), Benha University, Cairo, Egypt
Ahmed N. Khater , Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt.

Assistance Professor, Civil Engineering Department, Faculty of Engineering (Shoubra), Benha University, Cairo, Egypt

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Published

17-12-2023

Issue

Vol. 18 No. 67 (2024): January 2024

Section

Structural Integrity and Safety: Experimental and Numerical Perspectives

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

Retrofitting of Box Section Concrete Beams to Resist Shear and Torsion Using Near-Surface-Mount (NSM) GFRP Stirrups. (2023). Frattura Ed Integrità Strutturale, 18(67), 319-336. https://doi.org/10.3221/IGF-ESIS.67.23