Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams
This study delves into the efficacy of external strengthening methods in improving the shear behavior of defected reinforced concrete (RC) beams that lack shear stirrups, utilizing both experimental and numerical methodologies. Failure risk of such beams is a potential threat which is mitigated care...
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Frontiers Media S.A.
2024-10-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2024.1373292/full |
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| author | Alireza Bahrami Mohamed Ghalla Galal Elsamak Moataz Badawi Ehab A. Mlybari Fathi A. Abdelmgeed |
| author_facet | Alireza Bahrami Mohamed Ghalla Galal Elsamak Moataz Badawi Ehab A. Mlybari Fathi A. Abdelmgeed |
| author_sort | Alireza Bahrami |
| collection | DOAJ |
| description | This study delves into the efficacy of external strengthening methods in improving the shear behavior of defected reinforced concrete (RC) beams that lack shear stirrups, utilizing both experimental and numerical methodologies. Failure risk of such beams is a potential threat which is mitigated carefully to increase building safety and sustainability to avoid risk of construction failure. Ten RC beams underwent three-point experimental testing to assess the influence of the strengthening scheme and the presence of mechanical anchors. Two beams were designated as control specimens, while eight beams were strengthened with the application of additional strain-hardening cementitious composite (SHCC) layer in various configurations. These configurations encompassed single-sided, two-sided, and strip applications, with the inclusion of mechanical anchors. The study found that employing a single-sided SHCC, incorporating vertically bent bars into the RC beam, is recognized for its efficient alleviation of degradation in shear reinforcement. The incorporation of three SHCC strips to partially reinforce the compromised beams demonstrated a modest impact on the initial stiffness. Nevertheless, noteworthy enhancements of 46% and 42% were observed in both cracking and ultimate loads, respectively. Furthermore, increasing the number of the SHCC strips to four resulted in a more significant improvement in the load–deflection responses. Enhancing the compromised beams by applying four SHCC strips to the beams using bolts offers a feasible alternative to the configuration where SHCC was uniformly attached along the entire defected zone. Moreover, a numerical model was created to simulate the tested beams. The model effectively anticipated the progression of cracks, ultimate capacity, and deflection, indicating excellent agreement with the experimental observations. |
| format | Article |
| id | doaj-art-bb7ee4677a17475baed1e845aa631de1 |
| institution | OA Journals |
| issn | 2296-8016 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Materials |
| spelling | doaj-art-bb7ee4677a17475baed1e845aa631de12025-08-20T01:54:25ZengFrontiers Media S.A.Frontiers in Materials2296-80162024-10-011110.3389/fmats.2024.13732921373292Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beamsAlireza Bahrami0Mohamed Ghalla1Galal Elsamak2Moataz Badawi3Ehab A. Mlybari4Fathi A. Abdelmgeed5Department of Building Engineering, Energy Systems and Sustainability Science, Faculty of Engineering and Sustainable Development, University of Gävle, Gävle, SwedenCivil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, EgyptCivil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, EgyptDepartment of Civil Engineering, College of Engineering and Architecture, Umm Al-Qura University, Makkah, Saudi ArabiaDepartment of Civil Engineering, College of Engineering and Architecture, Umm Al-Qura University, Makkah, Saudi ArabiaCivil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, EgyptThis study delves into the efficacy of external strengthening methods in improving the shear behavior of defected reinforced concrete (RC) beams that lack shear stirrups, utilizing both experimental and numerical methodologies. Failure risk of such beams is a potential threat which is mitigated carefully to increase building safety and sustainability to avoid risk of construction failure. Ten RC beams underwent three-point experimental testing to assess the influence of the strengthening scheme and the presence of mechanical anchors. Two beams were designated as control specimens, while eight beams were strengthened with the application of additional strain-hardening cementitious composite (SHCC) layer in various configurations. These configurations encompassed single-sided, two-sided, and strip applications, with the inclusion of mechanical anchors. The study found that employing a single-sided SHCC, incorporating vertically bent bars into the RC beam, is recognized for its efficient alleviation of degradation in shear reinforcement. The incorporation of three SHCC strips to partially reinforce the compromised beams demonstrated a modest impact on the initial stiffness. Nevertheless, noteworthy enhancements of 46% and 42% were observed in both cracking and ultimate loads, respectively. Furthermore, increasing the number of the SHCC strips to four resulted in a more significant improvement in the load–deflection responses. Enhancing the compromised beams by applying four SHCC strips to the beams using bolts offers a feasible alternative to the configuration where SHCC was uniformly attached along the entire defected zone. Moreover, a numerical model was created to simulate the tested beams. The model effectively anticipated the progression of cracks, ultimate capacity, and deflection, indicating excellent agreement with the experimental observations.https://www.frontiersin.org/articles/10.3389/fmats.2024.1373292/fullfailure risk mitigationstrengtheningshearstrain-hardening cementitious compositeexternally bondedreinforced concrete beam |
| spellingShingle | Alireza Bahrami Mohamed Ghalla Galal Elsamak Moataz Badawi Ehab A. Mlybari Fathi A. Abdelmgeed Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams Frontiers in Materials failure risk mitigation strengthening shear strain-hardening cementitious composite externally bonded reinforced concrete beam |
| title | Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams |
| title_full | Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams |
| title_fullStr | Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams |
| title_full_unstemmed | Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams |
| title_short | Various configurations of externally bonded strain-hardening cementitious composite reducing shear failure risk of defected RC beams |
| title_sort | various configurations of externally bonded strain hardening cementitious composite reducing shear failure risk of defected rc beams |
| topic | failure risk mitigation strengthening shear strain-hardening cementitious composite externally bonded reinforced concrete beam |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2024.1373292/full |
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