Influence of cut–out openings on the flexural behavior of one–way concrete slabs strengthened with NSM–FRP bars and EB–CFRP strips
<p>Strengthening concrete slabs with cut-out openings is critical to maintain structural integrity in many retrofitting and repair applications. This paper presents both experimental and numerical findings on the flexural performance of reinforced concrete (RC) one–way slabs with cut–out openi...
محفوظ في:
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| مؤلفون آخرون: | , |
| منشور في: |
2025
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| الموضوعات: | |
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| الملخص: | <p>Strengthening concrete slabs with cut-out openings is critical to maintain structural integrity in many retrofitting and repair applications. This paper presents both experimental and numerical findings on the flexural performance of reinforced concrete (RC) one–way slabs with cut–out openings. The slabs were strengthened using either near–surface mounted fiber–reinforced polymer (NSM–FRP) bars or externally bonded carbon fiber–reinforced polymer (EB–CFRP) strips. Twelve one–way RC slabs were tested, the key experimental variables included the strengthening technique (NSM and EB), NSM reinforcement ratio (0.17 and 0.35 %), NSM bar material (stainless–steel, basalt FRP, carbon FRP, glass FRP bars), and the number of cut–out openings (one and two). Experimental findings revealed substantial improvements in the ultimate capacity, with enhancements of 71–190 % for NSM-strengthened slabs and 164–183 % for EB-strengthened slabs compared to unstrengthened slabs with cut-out openings. Notably, NSM-strengthened slabs achieved up to 18 % higher ductility than the control slab without cut-out openings, while EB-strengthened slabs exhibited a significant ductility reduction of 62–63 % due to debonding failures in the EB-CFRP strips. The improved flexural capacity in NSM-strengthened slabs was attributed to the better anchorage and confinement of bars within the concrete cover, which delayed debonding and allowed for more effective stress transfer. Basalt FRP–NSM bars demonstrated performance comparable to glass FRP–NSM bars, while the number of cut-out openings had a negligible effect on ultimate capacity. Finally, finite element models were developed using Abaqus software package. The developed models reasonably predicted the nonlinear structural performance of the strengthened slabs.</p><h2>Other Information</h2> <p> Published in: Structures<br> License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.istruc.2025.109547" target="_blank">https://dx.doi.org/10.1016/j.istruc.2025.109547</a></p> |
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