Title:
Cyclic Performance of Carbon Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Beams in Flexure
Author(s):
S. Alshamrani, F. H. Salahat, H. A. Rasheed, G. Shapack, and M. T. Albahttiti
Publication:
Structural Journal
Volume:
122
Issue:
2
Appears on pages(s):
161-174
Keywords:
backbone curve; carbon fiber anchors; flexural members; hysteresis modeling; seismic strengthening
DOI:
10.14359/51744397
Date:
3/1/2025
Abstract:
The behavior of carbon fiber-reinforced polymer (CFRP) flexurally strengthened reinforced concrete (RC) beams under reversed cyclic loading is not sufficiently studied. In this paper, normal-strength concrete is used with a typical steel ratio (0.5%) to build full-scale rectangular beams strengthened on top and bottom with flexural unanchored and anchored CFRP sheets. Five identical beams were examined under fully reversed cycles up to failure following the AC 125 displacement loading protocol. The first beam was tested as an unstrengthened control specimen. The second and third beams were tested as strengthened specimens using thin sheets with and without fiber anchors. On the other hand, the fourth and fifth beams were tested when strengthened using thick sheets with and without fiber anchors. Specimens with thin sheets underwent higher ductility and lower hysteresis pinching relative to the thick ones. The results are comparatively discussed and compared to a phenomenological cyclic analysis model showing promising correspondence.
Related References:
1. Esmaeili, J.; Aghdam, O. R.; Andalibi, K.; Kasaei, J.; and Gencel, O., “Experimental and Numerical Investigations on a Novel Plate Anchorage System to Solve FRP Debonding Problem in the Strengthened RC Beams,” Journal of Building Engineering, V. 45, 2022, p. 103413. doi: 10.1016/j.jobe.2021.103413
2. Ceroni, F.; Pecce, M.; Matthys, S.; and Taerwe, L., “Debonding Strength and Anchorage Devices for Reinforced Concrete Elements Strengthened with FRP Sheets,” Composites Part B: Engineering, V. 39, No. 3, 2008, pp. 429-441. doi: 10.1016/j.compositesb.2007.05.002
3. Liu, D.; Qin, F.; Di, J.; and Zhang, Z., “Flexural Behavior of Reinforced Concrete (RC) Beams Strengthened With Carbon Fiber Reinforced Polymer (CFRP) and ECC,” Case Studies in Construction Materials, V. 19, 2023, p. e02270. doi: 10.1016/j.cscm.2023.e02270
4. Liu, L.; Yu, S.; and Ma, X., “Flexural Capacity of RC Beams Reinforced with ECC Layer and Steel Plate,” Journal of Building Engineering, V. 65, 2023, p. 105781. doi: 10.1016/j.jobe.2022.105781
5. Li, X.; Deng, J.; Liu, Z.; Zhu, M.; and Luo, S., “Cracking Behavior of Prestressed CFRP Strengthened RC Beams Subjected to Wetting/Drying Cycling under Flexural Load,” Construction and Building Materials, V. 398, 2023, p. 132403. doi: 10.1016/j.conbuildmat.2023.132403
6. Alabdulhady, M. Y.; Ojaimi, M. F.; and Chkheiwer, A. H., “The Efficiency of CFRP Strengthening and Repair System on the Flexural Behavior of RC Beams Constructed with Different Concrete Compressive Strength,” Results in Engineering, V. 16, 2022, p. 100763. doi: 10.1016/j.rineng.2022.100763
7. Jawdhari, A.; Peiris, A.; and Harik, I., “Experimental Study on RC Beams Strengthened with CFRP Rod Panels,” Engineering Structures, V. 173, 2018, pp. 693-705. doi: 10.1016/j.engstruct.2018.06.105
8. Abdulrahman, B. Q., “Precise Finite Element Verification of the Unreliability of Using Multi-Layers of FRP on CFRP-Debonding in RC Beams,” Engineering Research Express, V. 4, No. 2, 2022, p. 025048. doi: 10.1088/2631-8695/ac7945
9. Dias, S. J.; Barros, J. A.; and Janwaen, W., “Behavior of RC Beams Flexurally Strengthened with NSM CFRP Laminates,” Composite Structures, V. 201, 2018, pp. 363-376. doi: 10.1016/j.compstruct.2018.05.126
10. Anil, Ö., “Strengthening of RC T-Section Beams with Low Strength Concrete Using CFRP Composites Subjected to Cyclic Load,” Construction and Building Materials, V. 22, No. 12, 2008, pp. 2355-2368. doi: 10.1016/j.conbuildmat.2007.10.003
11. Capani, F.; D’Ambrisi, A.; De Stefano, M.; Focacci, F.; Luciano, R.; Nudo, R.; and Penna, R., “Experimental Investigation on Cyclic Response of RC Elements Repaired by CFRP External Reinforcing Systems,” Composites Part B: Engineering, V. 112, 2017, pp. 290-299. doi: 10.1016/j.compositesb.2016.12.053
12. Saqan, E. I.; Rasheed, H. A.; and Alkhrdaji, T., “Evaluation of the Seismic Performance of Reinforced Concrete Frames Strengthened with CFRP Fabric and NSM Bars,” Composite Structures, V. 184, 2018, pp. 839-847. doi: 10.1016/j.compstruct.2017.10.069
13. Saqan, E. I.; Rasheed, H. A.; and Alkhrdaji, T., “Seismic Behavior of Carbon Fiber-Reinforced Polymer-Strengthened Reinforced Concrete Members with Various Anchors,” ACI Structural Journal, V. 117, No. 4, July 2020, pp. 3-14.
14. Alkhawaldeh, A. A., and Alrousan, R. Z., “Improving Cyclic Response of Heat-Damaged Non-Ductile RC Joints Using CFRP Hybrid Systems,” Construction and Building Materials, V. 377, 2023, p. 131150. doi: 10.1016/j.conbuildmat.2023.131150
15. Kaya, E.; Kütan, C.; Sheikh, S.; and İlki, A., “Flexural Retrofit of Support Regions of Reinforced Concrete Beams with Anchored FRP Ropes Using NSM and ETS Methods Under Reversed Cyclic Loading,” Journal of Composites for Construction, ASCE, V. 21, No. 1, 2017, p. 04016072. doi: 10.1061/(ASCE)CC.1943-5614.0000732
16. Bai, Y. L.; Bai, S. C.; Mei, S. J.; Jia, J. F.; and Yang, K., “Seismic Behavior of RC Square Columns Strengthened with LRS FRP Under High Axial Load Ratio,” Structures, V. 56, 2023, p. 104867.
17. Zaki, M. A., Rasheed, H. A. and Alkhrdaji, T., “Performance of CFRP-Strengthened Concrete Beams Fastened with Distributed CFRP Dowel and Fiber Anchors,” Composites Part B: Engineering, V. 176, Nov. 2019, p. 107117.
18. Kang, T. H. K.; Howell, J.; Kim, S.; and Lee, D. J., “A State-of-the-Art Review on Debonding Failures of FRP Laminates Externally Adhered to Concrete,” International Journal of Concrete Structures and Materials, V. 6, No. 2, 2012, pp. 123-134. doi: 10.1007/s40069-012-0012-1
19. Büyüköztürk, O., and Yu, T. Y., “Understanding and Assessment of Debonding Failures in FRP-Concrete Systems,” Seventh International Congress on Advances in Civil Engineering, 2006, pp. 11-13.
20. Vu, H. D., and Phan, D. N., “A Framework for Predicting the Debonding Failure Modes of RC Beams Strengthened Flexurally with FRP Sheets,” Innovative Infrastructure Solutions, V. 7, No. 292, 2022, p. 292. doi: 10.1007/s41062-022-00890-0
21. Seracino, R.; Raizal Saifulnaz, M. R.; and Oehlers, D. J., “Generic Debonding Resistance of EB and NSM Plate-to-Concrete Joints,” Journal of Composites for Construction, ASCE, V. 11, No. 1, 2007, pp. 62-70. doi: 10.1061/(ASCE)1090-0268(2007)11:1(62)
22. Iovinella, I.; Prota, A.; and Mazzotti, C., “Influence of Surface Roughness on the Bond of FRP Laminates to Concrete,” Construction and Building Materials, V. 40, 2013, pp. 533-542. doi: 10.1016/j.conbuildmat.2012.09.112
23. Mazzotti, C.; Bilotta, A.; Carloni, C.; Ceroni, F.; D’Antino, T.; Nigro, E.; and Pellegrino, C., Design Procedures for the Use of Composites in Strengthening of Reinforced Concrete Structures, Springer, Dordrecht, the Netherlands, 2016, pp. 39-96.
24. Coelho, M. R. F.; Sena-Cruz, J. M.; and Neves, L. A. C., “A Review on the Bond Behavior of FRP NSM Systems in Concrete,” Construction and Building Materials, V. 93, 2015, pp. 1157-1169. doi: 10.1016/j.conbuildmat.2015.05.010
25. Soares, S.; Sena-Cruz, J.; Cruz, J. R.; and Fernandes, P., “Influence of Surface Preparation Method on the Bond Behavior of Externally Bonded CFRP Reinforcements in Concrete,” Materials (Basel), V. 12, No. 3, 2019, p. 414. doi: 10.3390/ma12030414
26. Mazzotti, C.; Savoia, M.; and Ferracuti, B., “An Experimental Study on Delamination of FRP Plates Bonded to Concrete,” Construction and Building Materials, V. 22, No. 7, 2008, pp. 1409-1421. doi: 10.1016/j.conbuildmat.2007.04.009
27. Al-Saadi, N. T. K.; Mohammed, A.; Al-Mahaidi, R.; and Sanjayan, J., “A State-of-the-Art Review: Near-Surface Mounted FRP Composites for Reinforced Concrete Structures,” Construction and Building Materials, V. 209, 2019, pp. 748-769. doi: 10.1016/j.conbuildmat.2019.03.121
28. Salahat, F. H.; Rasheed, H. A.; and Ashqar, H. I., “Explaining Concrete Cover Delamination Failure Mechanisms in CFRP Strengthened RC Beams to Propose Mechanics-Based Design Approach,” Structures, V. 63, 2024, p. 106295.
29. Al-Zu’bi, M.; Fan, M.; and Anguilano, L., “Advances in Bonding Agents for Retrofitting Concrete Structures with Fibre Reinforced Polymer Materials: A Review,” Construction and Building Materials, V. 330, 2022, p. 127115. doi: 10.1016/j.conbuildmat.2022.127115
30. Alwash, D.; Kalfat, R.; Du, H.; and Al-Mahaidi, R., “Development of a New Nano Modified Cement Based Adhesive for FRP Strengthened RC Members,” Construction and Building Materials, V. 277, 2021, p. 122318. doi: 10.1016/j.conbuildmat.2021.122318
31. Correia, L.; Teixeira, T.; Michels, J.; Almeida, J. A.; and Sena-Cruz, J., “Flexural Behaviour of RC Slabs Strengthened with Prestressed CFRP Strips Using Different Anchorage Systems,” Composites Part B: Engineering, V. 81, 2015, pp. 158-170. doi: 10.1016/j.compositesb.2015.07.011
32. Wang, Q.; Zhu, H.; Zhang, B.; Tong, Y.; Teng, F.; and Su, W., “Anchorage Systems for Reinforced Concrete Structures Strengthened with Fiber-Reinforced Polymer Composites: State-of-the-Art Review,” Journal of Reinforced Plastics and Composites, V. 39, No. 9-10, 2020, pp. 327-344. doi: 10.1177/0731684420905010
33. Kalfat, R.; Al-Mahaidi, R.; and Smith, S. T., “Anchorage Devices Used to Improve the Performance of Reinforced Concrete Beams Retrofitted with FRP Composites: State-of-the-Art Review,” Journal of Composites for Construction, ASCE, V. 17, No. 1, 2013, pp. 14-33. doi: 10.1061/(ASCE)CC.1943-5614.0000276
34. Pham, H. B., and Al-Mahaidi, R., “Prediction Models for Debonding Failure Loads of Carbon Fiber Reinforced Polymer Retrofitted Reinforced Concrete Beams,” Journal of Composites for Construction, ASCE, V. 10, No. 1, 2006, pp. 48-59. doi: 10.1061/(ASCE)1090-0268(2006)10:1(48)
35. Wu, Y. F., and Huang, Y., “Hybrid Bonding of FRP to Reinforced Concrete Structures,” Journal of Composites for Construction, ASCE, V. 12, No. 3, 2008, pp. 266-273. doi: 10.1061/(ASCE)1090-0268(2008)12:3(266)
36. Zhang, H. W.; Smith, S. T.; and Kim, S. J., “Optimization of Carbon and Glass FRP Anchor Design,” Construction and Building Materials, V. 32, 2012, pp. 1-12. doi: 10.1016/j.conbuildmat.2010.11.100.
37. Shekarchi, W. A.; Pudleiner, D. K.; Alotaibi, N. K.; Ghannoum, W. M.; and Jirsa, J. O., “Carbon Fiber-Reinforced Polymer Spike Anchor Design Recommendations,” ACI Structural Journal, V. 117, No. 6, Nov. 2020, pp. 171-182.
38. Saeed, Y. M.; Aules, W. A.; Rad, F. N.; and Raad, A. M., “Tensile Behavior of FRP Anchors Made from CFRP Ropes Epoxy-Bonded to Uncracked Concrete for Flexural Strengthening of RC Columns,” Case Studies in Construction Materials, V. 13, 2020, p. e00435. doi: 10.1016/j.cscm.2020.e00435
39. Zaki, M. A., and Rasheed, H. A., “Impact of Efficiency and Practicality of CFRP Anchor Installation Techniques on the Performance of RC Beams Strengthened with CFRP Sheets,” Canadian Journal of Civil Engineering, V. 46, No. 9, 2019, pp. 796-809. doi: 10.1139/cjce-2018-0560
40. Llauradó, P. V.; Porres, R. C.; Blázquez, A. S.; Olalla, F. S.; and Álvarez, F. G., “Flexural Tests for Efficiency Evaluation of Spike Anchors on CFRP-Strengthened Concrete,” Materials, V. 16, No. 1, 2022, p. 164. doi: 10.3390/ma16010164
41. Mhanna, H. H.; Hawileh, R. A.; and Abdalla, J. A., “Effect of FRP Anchor Inclination Angle on Shear Strengthening of Reinforced Concrete T-Beams,” 10th International Conference on FRP Composites in Civil Engineering, 2022, pp. 2169-2179.
42. Zaki, M. A.; Rasheed, H. A.; Roukerd, R. R.; and Raheem, M., “Performance of Reinforced Concrete T Beams Strengthened with Flexural CFRP Sheets and Secured Using CFRP Splay Anchors,” Engineering Structures, V. 210, 2020, p. 110304. doi: 10.1016/j.engstruct.2020.110304.
43. Llauradó, V.; Paula, J. F. G.; and González Ramos, F. J., “Influence of the Anchor Fan Position on the Performance of FRP Anchors,” High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, Maastricht, the Netherlands, 2018, pp. 191-198.
44. Esmaeeli, E., and Shadan, P., “Effectiveness of Fan Anchors in Preventing Debonding in FRP-Strengthened Steel Members,” International Journal of Steel Structures, V. 23, No. 1, 2023, pp. 96-119. doi: 10.1007/s13296-022-00681-4
45. Chen, C.; Chen, J.; Zhou, Y.; Sui, L.; and Hu, B., “Design of Ductile H-Anchorage for Strengthening Reinforced Concrete Beams with Prestressed FRP,” Construction and Building Materials, V. 307, 2021, p. 124883. doi: 10.1016/j.conbuildmat.2021.124883
46. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19) (Reapproved 2022),” American Concrete Institute, Farmington Hills, MI, 2019, 624 pp.
47. Rasheed, H. A.; Decker, B. R.; Esmaeily, A.; Peterman, R. J.; and Melhem, H. G., “The Influence of CFRP Anchorage on Achieving Sectional Flexural Capacity of Strengthened Concrete Beams,” Fibers, V. 3, No. 4, 2015, pp. 539-559. doi: 10.3390/fib3040539
48. del Rey Castillo, E.; Kanitkar, R.; Smith, S. T.; Griffith, M. C.; and Ingham, J. M., “Design Approach for FRP Spike Anchors in FRP-Strengthened RC Structures,” Composite Structures, V. 214, 2019, pp. 23-33. doi: 10.1016/j.compstruct.2019.01.100
49. ICC ES AC125, “Acceptance Criteria for Concrete and Reinforced and Unreinforced Masonry Strengthening Using Externally Bonded Fiber-
Reinforced Polymer (FRP) Composite Systems,” International Code Council Evaluation Services, Brea, CA, 2021.
50. Alshamrani, S.; Saleem, S. M.; Rasheed, H. A.; and Salahat, F. H., “Modeling Cyclic Response of CFRP Strengthened Fiber Anchored RC Frame Members to Failure,” Proceedings of the 16th International Symposium on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures (FRPRCS-16), SP-360, American Concrete Institute, Farmington Hills, MI, 2024, pp. 423-441.
51. Charkas, H.; Rasheed, H.; and Melhem, H., “Rigorous Procedure for Calculating Deflections of Fiber Reinforced Polymer-Strengthened Reinforced Concrete Beams,” ACI Structural Journal, V. 100, No. 4, July-Aug. 2003, pp. 529-539.
52. ACI Committee 440, “Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures—Guide (ACI PRC-440.2-23),” American Concrete Institute, Farmington Hills, MI, 2023, 109 pp.