Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems
Abstract This research investigates the flexural performance of strengthened rubberized concrete beams via bottom, side, and hybrid near-surface mounted (NSM) approaches using GFRP/steel rebars. Eleven strengthened specimens, alongside one control, were subjected to four-point loading setup till fai...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-07-01
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| Series: | International Journal of Concrete Structures and Materials |
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| Online Access: | https://doi.org/10.1186/s40069-025-00795-z |
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| _version_ | 1849344723436699648 |
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| author | Mohamed Emara Abdulrahman H. Mostafa Heba A. Mohamed Mahmoud Zaghlal |
| author_facet | Mohamed Emara Abdulrahman H. Mostafa Heba A. Mohamed Mahmoud Zaghlal |
| author_sort | Mohamed Emara |
| collection | DOAJ |
| description | Abstract This research investigates the flexural performance of strengthened rubberized concrete beams via bottom, side, and hybrid near-surface mounted (NSM) approaches using GFRP/steel rebars. Eleven strengthened specimens, alongside one control, were subjected to four-point loading setup till failure. The investigation focused on three key parameters: strengthening technique (bottom, side, or hybrid), NSM bar area, and bar type (GFRP or steel). The results revealed significant improvements across various performance metrics. It was demonstrated that NSM strengthening enhanced the beam’s cracking loads by up to 90%. Correspondingly, the strengthened beam’s yield and ultimate loads witnessed enhancements up to 48% and 79%, respectively. Notably, the load-carrying ability of GFRP bars consistently outperformed steel bars. Additionally, increasing the quantity of NSM strengthening proved beneficial, with bottom placement offering a slight advantage due to a larger internal lever arm. The proposed hybrid NSM technique, employing three 8-mm-diameter GFRP bars, emerged as the most effective strengthening scheme. However, utilizing four bars resulted in decreased effectiveness due to overlapping tensile stresses and accelerated debonding failure. Finally, the experimental results were compared to analytical predictions, with close agreement observed. The experimental-to-predicted analytical result ratio varies from 0.84 to 1.01%, indicating the validity of the analytical approach. |
| format | Article |
| id | doaj-art-32ed890594544f1cb87f9abed3a80cb4 |
| institution | Kabale University |
| issn | 2234-1315 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Concrete Structures and Materials |
| spelling | doaj-art-32ed890594544f1cb87f9abed3a80cb42025-08-20T03:42:37ZengSpringerOpenInternational Journal of Concrete Structures and Materials2234-13152025-07-0119111710.1186/s40069-025-00795-zPerformance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted SystemsMohamed Emara0Abdulrahman H. Mostafa1Heba A. Mohamed2Mahmoud Zaghlal3Structural Engineering Department, Faculty of Engineering, Zagazig UniversityStructural Engineering Department, Faculty of Engineering, Zagazig UniversityStructural Engineering Department, Faculty of Engineering, Zagazig UniversityStructural Engineering Department, Faculty of Engineering, Zagazig UniversityAbstract This research investigates the flexural performance of strengthened rubberized concrete beams via bottom, side, and hybrid near-surface mounted (NSM) approaches using GFRP/steel rebars. Eleven strengthened specimens, alongside one control, were subjected to four-point loading setup till failure. The investigation focused on three key parameters: strengthening technique (bottom, side, or hybrid), NSM bar area, and bar type (GFRP or steel). The results revealed significant improvements across various performance metrics. It was demonstrated that NSM strengthening enhanced the beam’s cracking loads by up to 90%. Correspondingly, the strengthened beam’s yield and ultimate loads witnessed enhancements up to 48% and 79%, respectively. Notably, the load-carrying ability of GFRP bars consistently outperformed steel bars. Additionally, increasing the quantity of NSM strengthening proved beneficial, with bottom placement offering a slight advantage due to a larger internal lever arm. The proposed hybrid NSM technique, employing three 8-mm-diameter GFRP bars, emerged as the most effective strengthening scheme. However, utilizing four bars resulted in decreased effectiveness due to overlapping tensile stresses and accelerated debonding failure. Finally, the experimental results were compared to analytical predictions, with close agreement observed. The experimental-to-predicted analytical result ratio varies from 0.84 to 1.01%, indicating the validity of the analytical approach.https://doi.org/10.1186/s40069-025-00795-zStrengtheningNSMSNSMFlexural behaviorGFRP barsRubberized concrete |
| spellingShingle | Mohamed Emara Abdulrahman H. Mostafa Heba A. Mohamed Mahmoud Zaghlal Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems International Journal of Concrete Structures and Materials Strengthening NSM SNSM Flexural behavior GFRP bars Rubberized concrete |
| title | Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems |
| title_full | Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems |
| title_fullStr | Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems |
| title_full_unstemmed | Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems |
| title_short | Performance of Rubberized RC Beams Flexural-Strengthened Using Near-Surface Mounted Systems |
| title_sort | performance of rubberized rc beams flexural strengthened using near surface mounted systems |
| topic | Strengthening NSM SNSM Flexural behavior GFRP bars Rubberized concrete |
| url | https://doi.org/10.1186/s40069-025-00795-z |
| work_keys_str_mv | AT mohamedemara performanceofrubberizedrcbeamsflexuralstrengthenedusingnearsurfacemountedsystems AT abdulrahmanhmostafa performanceofrubberizedrcbeamsflexuralstrengthenedusingnearsurfacemountedsystems AT hebaamohamed performanceofrubberizedrcbeamsflexuralstrengthenedusingnearsurfacemountedsystems AT mahmoudzaghlal performanceofrubberizedrcbeamsflexuralstrengthenedusingnearsurfacemountedsystems |