Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams
The present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-03-01
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| Series: | Journal of the Mechanical Behavior of Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/jmbm-2022-0243 |
| _version_ | 1797848631216177152 |
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| author | Ayaad Noor Oukaili Nazar |
| author_facet | Ayaad Noor Oukaili Nazar |
| author_sort | Ayaad Noor |
| collection | DOAJ |
| description | The present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An experimental program was conducted on spandrel beams considering different key parameters including the cross-sectional aspect ratio (i.e., web height/web thickness), and the availability of the CFRP strengthening system. The ledge of the spandrel beams was exposed during testing to a very high eccentric load, which was transferred to the web of the spandrel beam causing high shear, torsion, and bending moments. Consequently, the applied load resulted in in-plane and out-of-plane deformations of the web accompanied by flexural and shear cracks. This article demonstrates the advantage of using CFRP sheets to strengthen the mentioned members. The applied CFRP sheets increased the failure torsional load by about 37% compared to the identical L-spandrels without strengthening. The outcomes indicate that using CFRP sheets show improvement in restricting the deflections and rotation of L-spandrels due to increasing spandrel stiffness. The reduction in the degree of rotation attained more than 33% in comparison to the spandrel beams without strengthening. The experimental program confirmed the applicability of the proposed strengthening technique for compacted and slender L-shaped spandrel-reinforced concrete beams. |
| first_indexed | 2024-04-09T18:31:40Z |
| format | Article |
| id | doaj.art-2564086e69a44d1d8630ec0c2f8f8867 |
| institution | Directory Open Access Journal |
| issn | 2191-0243 |
| language | English |
| last_indexed | 2024-04-09T18:31:40Z |
| publishDate | 2023-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Journal of the Mechanical Behavior of Materials |
| spelling | doaj.art-2564086e69a44d1d8630ec0c2f8f88672023-04-11T17:07:17ZengDe GruyterJournal of the Mechanical Behavior of Materials2191-02432023-03-013218811210.1515/jmbm-2022-0243Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beamsAyaad Noor0Oukaili Nazar1Department of Civil Engineering, University of Baghdad, Baghdad10070, IraqDepartment of Civil Engineering, University of Baghdad, Baghdad10070, IraqThe present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An experimental program was conducted on spandrel beams considering different key parameters including the cross-sectional aspect ratio (i.e., web height/web thickness), and the availability of the CFRP strengthening system. The ledge of the spandrel beams was exposed during testing to a very high eccentric load, which was transferred to the web of the spandrel beam causing high shear, torsion, and bending moments. Consequently, the applied load resulted in in-plane and out-of-plane deformations of the web accompanied by flexural and shear cracks. This article demonstrates the advantage of using CFRP sheets to strengthen the mentioned members. The applied CFRP sheets increased the failure torsional load by about 37% compared to the identical L-spandrels without strengthening. The outcomes indicate that using CFRP sheets show improvement in restricting the deflections and rotation of L-spandrels due to increasing spandrel stiffness. The reduction in the degree of rotation attained more than 33% in comparison to the spandrel beams without strengthening. The experimental program confirmed the applicability of the proposed strengthening technique for compacted and slender L-shaped spandrel-reinforced concrete beams.https://doi.org/10.1515/jmbm-2022-0243l-shaped spandrel beamscfrp strengtheningshear and torsion stressesload–rotation angle response |
| spellingShingle | Ayaad Noor Oukaili Nazar Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams Journal of the Mechanical Behavior of Materials l-shaped spandrel beams cfrp strengthening shear and torsion stresses load–rotation angle response |
| title | Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams |
| title_full | Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams |
| title_fullStr | Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams |
| title_full_unstemmed | Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams |
| title_short | Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams |
| title_sort | efficiency of cfrp torsional strengthening technique for l shaped spandrel reinforced concrete beams |
| topic | l-shaped spandrel beams cfrp strengthening shear and torsion stresses load–rotation angle response |
| url | https://doi.org/10.1515/jmbm-2022-0243 |
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