Enhancement of punching shear behavior of reinforced concrete flat slabs using GFRP grating

Ahmed Mahmoud; Haitham Mostafa; Tarek Mostafa; Ahmed Khater

doi:10.3221/IGF-ESIS.68.02

Enhancement of punching shear behavior of reinforced concrete flat slabs using GFRP grating

Authors

Ahmed Mahmoud Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt
Haitham F. Mostafa Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt https://orcid.org/0009-0004-2287-7564
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.68.02

Keywords:

Punching shear, GFRP grating, RC flat slab, Numerical analysis, Experimental investigation, Code provisions

Abstract

The literature review showed insufficient relevant research on the application of Glass-Fiber-Reinforced-Polymers (GFRP) gratings in the structural elements, while GFRP bars, laminate, sheets, and strips, have been extensively explored. This research aims to present a proposal for a new reinforcing system using GFRP gratings to improve the punching shear resistance of RC flat slabs. Results of seven specimens tested experimentally under vertical static loading are displayed, taking into account the influence of the gratings variables. Test results revealed an improvement in the ultimate load ranging between 9.03% and 27.67% for the specimens strengthened by the proposed GFRP grating system. A Nonlinear Finite Element Analysis (NLFEA) was carried out using the ANSYS program with correlational evaluation using load-deflection response and cracking pattern, which resulted in a good convergence of numerical simulations and experimental performance results ranging from 1.0% to 8.0%. Key parameters, namely the concrete compressive strength, steel reinforcement yield strength, main steel reinforcement ratio, secondary steel reinforcement ratio, column dimensions, slab thickness, concrete cover, and GFRP gratings characteristics, were investigated through a parametric study adopting NLFEA by the ANSYS program, where the output results were compared to the recent code provisions.

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Author Biographies

Haitham F. Mostafa, Benha University, Faculty of Engineering at Shoubra, Civil Engineering Department, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt

Research Assistant , Civil Engineering Department, Faculty of Engineering (Shoubra), Benha University, Cairo, Egypt
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

15-02-2024

Issue

Vol. 18 No. 68 (2024): April 2024

Section

Integrity of materials and structures

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

Enhancement of punching shear behavior of reinforced concrete flat slabs using GFRP grating. (2024). Frattura Ed Integrità Strutturale, 18(68), 19-44. https://doi.org/10.3221/IGF-ESIS.68.02