Investigation of the Stiffness and Ductility of Pre-Cracked RC Beams after repairing with CFRP using Different Strengthening Methods
Received: 23 October 2023 | Revised: 11 November 2023 | Accepted: 13 November 2023 | Online: 5 December 2023
Corresponding author: Abbas Yahya Turki
Abstract
This study investigated the stiffness and ductility of rectangular Reinforced Concrete (RC) beams. The beams were obtained through an experimental program that included one reference and eight RC beams, divided into two separate groups strengthened with Externally Bonded Reinforcement (EBR) and Near-Surface Mounted (NSM) reinforcement in flexural using Carbon Fiber Reinforced Polymer (CFRP) laminate after they were pre-cracked or damaged at different levels. The comparison results of the reference and the strengthened beams showed that the latter had a higher degree of stiffness. The stiffness in the yielding stage increased by 6.43% to 19.81% for the EBR-strengthened group and by 31.08% to 105.8% for the NSM-strengthened group. At the 140 kN loading stage, the stiffness increased by 33 to 101.5% for the EBR-strengthened group and by 136.5% to 332.25% for the NSM-strengthened group. At the ultimate load stage, the stiffness increased by 12.72% to 46.13% for the EBR-strengthened group and by 56.85% to 122.94% for the NSM-strengthened group. On the other hand, the comparison revealed that the ductility of the reference beam was much better than that of the reinforced beams.
Keywords:
CFRP, stiffness, ductility, pre-cracked, reinforced concrete, flexural strengtheningDownloads
References
A. Y. Turki and M. H. Al-Farttoosi, "Flexural Strength of Damaged RC Beams Repaired with Carbon Fiber-Reinforced Polymer (CFRP) Using Different Techniques," Fibers, vol. 11, no. 7, 2023.
T. H. Ibrahim and A. A. Allawi, "The Response of Reinforced Concrete Composite Beams Reinforced with Pultruded GFRP to Repeated Loads," Journal of Engineering, vol. 29, no. 1, pp. 158–174, Jan. 2023.
H. A. Al-Baghdadi and A. Sabah, "Behavior of RC Beams Strengthened with NSM-CFRP Strips Subjected to Fire Exposure: A Numerical Study," Engineering, Technology & Applied Science Research, vol. 11, no. 6, pp. 7782–7787, Dec. 2021.
A. J. Daraj and A. H. Al-Zuhairi, "The Combined Strengthening Effect of CFRP Wrapping and NSM CFRP Laminates on the Flexural Behavior of Post-Tensioning Concrete Girders Subjected to Partially Strand Damage," Engineering, Technology & Applied Science Research, vol. 12, no. 4, pp. 8856–8863, Aug. 2022.
T. H. Ibrahim, A. A. Allawi, and A. El-Zohairy, "Impact Behavior of Composite Reinforced Concrete Beams with Pultruded I-GFRP Beam," Materials, vol. 15, no. 2, 2022.
H. Al-Quraishi, M. Al-Farttoosi, and R. Abdulkhudhur, "Compression Splices of Reinforcing Bars in Reactive Powder Concrete," Civil Engineering Journal, vol. 5, no. 10, pp. 2221–2232, Oct. 2019.
A. Kareem and S. D. Mohammed, "The Experimental and Theoretical Effect of Fire on the Structural Behavior of Laced Reinforced Concrete Deep Beams," Engineering, Technology & Applied Science Research, vol. 13, no. 5, pp. 11795–11800, Oct. 2023.
R. M. Abbas and R. K. Rakaa, "Structural Performance of Lightweight Fiber Reinforced Polystyrene Aggregate Self-Compacted Concrete Beams," Engineering, Technology & Applied Science Research, vol. 13, no. 5, pp. 11865–11870, Oct. 2023.
H. Q. Abbas and A. H. Al‐Zuhairi, "Impact of Anchored CFRP Composites on the Strengthening of Partially Damaged PC Girders," Journal of Engineering, vol. 29, no. 08, pp. 106–120, Aug. 2023.
Z. Wu, Y. Shao, K. Iwashita, and K. Sakamoto, "Strengthening of Preloaded RC Beams Using Hybrid Carbon Sheets," Journal of Composites for Construction, vol. 11, no. 3, pp. 299–307, Jun. 2007.
N. Ali, A. A. A. Samad, N. Mohamad, and J. Jayaprakash, "Shear Behaviour of Pre-cracked Continuous Beam Repaired using Externally Bonded CFRP Strips," Procedia Engineering, vol. 53, pp. 129–144, Jan. 2013.
N. Zhuang, H. Dong, D. Chen, and Y. Ma, "Experimental Study of Aged and Seriously Damaged RC Beams Strengthened Using CFRP Composites," Advances in Materials Science and Engineering, vol. 2018, Oct. 2018, Art. no. e6260724.
S. M. Samindi, M. K. Samarakoon, B. Piatek, and G. H. M. J. Subashi De Silva, "Investigation of the Flexural Behavior of Preloaded and Pre-Cracked Reinforced Concrete Beams Strengthened with CFRP Plates," Materials, vol. 16, no. 1, Art. no. 22, Jan. 2023.
A. M. Morsy, E.-T. M. El-Tony, and M. El-Naggar, "Flexural repair/strengthening of pre-damaged R.C. beams using embedded CFRP rods," Alexandria Engineering Journal, vol. 54, no. 4, pp. 1175–1179, Dec. 2015.
M. R. Gaber and H. A. Al-Baghdadi, "Response of Damaged Reinforced Concrete Beams Strengthened with NSM CFRP Strips," Key Engineering Materials, vol. 857, pp. 3–9, 2020.
T. Imjai, M. Setkit, R. Garcia, and F. P. Figueiredo, "Strengthening of damaged low strength concrete beams using PTMS or NSM techniques," Case Studies in Construction Materials, vol. 13, Dec. 2020, Art. no. e00403.
K. A. Abbood and R. A. Daud, "Experiment Investigation of Behavior of Preloaded Thick One –Way Slabs Repaired by NSM CFRP Plate," Mathematical Statistician and Engineering Applications, vol. 71, no. 4, pp. 3695–3708, Sep. 2022.
J. Xie and R. Hu, "Experimental study on rehabilitation of corrosion-damaged reinforced concrete beams with carbon fiber reinforced polymer," Construction and Building Materials, vol. 38, pp. 708–716, Jan. 2013.
R. Z. Al-Rousan and A. Alkhawaldeh, "Behavior of heated damaged reinforced concrete beam-column joints strengthened with FRP," Case Studies in Construction Materials, vol. 15, Dec. 2021, Art. no. e00584.
A. Al-khreisat, M. Abdel-Jaber, and A. Ashteyat, "Shear Strengthening and Repairing of Reinforced Concrete Deep Beams Damaged by Heat Using NSM-CFRP Ropes," Fibers, vol. 11, no. 4, 2023.
F. M. Mukhtar and M. E. Shehadah, "Shear behavior of flexural CFRP-strengthened RC beams with crack-induced delamination: Experimental investigation and strength model," Composite Structures, vol. 268, Jul. 2021, Art. no. 113894.
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