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Aljazaari, Rasha A., Vaseghi Amiri, Javad, Alghazali, Hayder. (1405). Experimental Assessment for Restoring the Flexural Strength of Severely Damaged RC Beams Using NSM Steel Bars and External Confinement. پژوهشنامه مدیریت اجرایی, (), 161-178. doi: 10.22080/ceas.2026.31548.1090
Rasha A. Aljazaari; Javad Vaseghi Amiri; Hayder Alghazali. "Experimental Assessment for Restoring the Flexural Strength of Severely Damaged RC Beams Using NSM Steel Bars and External Confinement". پژوهشنامه مدیریت اجرایی, , , 1405, 161-178. doi: 10.22080/ceas.2026.31548.1090
Aljazaari, Rasha A., Vaseghi Amiri, Javad, Alghazali, Hayder. (1405). 'Experimental Assessment for Restoring the Flexural Strength of Severely Damaged RC Beams Using NSM Steel Bars and External Confinement', پژوهشنامه مدیریت اجرایی, (), pp. 161-178. doi: 10.22080/ceas.2026.31548.1090
Aljazaari, Rasha A., Vaseghi Amiri, Javad, Alghazali, Hayder. Experimental Assessment for Restoring the Flexural Strength of Severely Damaged RC Beams Using NSM Steel Bars and External Confinement. پژوهشنامه مدیریت اجرایی, 1405; (): 161-178. doi: 10.22080/ceas.2026.31548.1090

Experimental Assessment for Restoring the Flexural Strength of Severely Damaged RC Beams Using NSM Steel Bars and External Confinement

Civil Engineering and Applied Solutions
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 20 خرداد 1405
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22080/ceas.2026.31548.1090
نویسندگان
Rasha A. Aljazaari1؛ Javad Vaseghi Amiri* 2؛ Hayder Alghazali1
1Department of Civil Engineering, Engineering College/ Kufa University, Najaf, Iraq
2Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
تاریخ دریافت: 26 فروردین 1405،  تاریخ بازنگری: 13 اردیبهشت 1405،  تاریخ پذیرش: 20 خرداد 1405 
چکیده
Reinforced concrete beams may require repair to regain lost capacity due to unforeseen events, such as accidents or loading exceeding the limits that weren't predicted in the design. The purpose of this research is to restore the load capacity of RC beams after severe mid-span damage. Eight reinforced concrete beams were utilized in this study. A near-surface mounting (NSM) technique was examined, with various variables including the configuration of repair bars, adhesive materials, diameter of repair bars, as well as externally bonded repair with a steel plate in the damaged zone. The result revealed that straight bars restored up to 94.5% of ultimate strength, while hooked bars slightly exceeded the control by 5%. Epoxy bonds achieved up to 105.6% recovery, surpassing cementitious systems that ranged from 66.8% to 110.6%. Larger repairing bars of 16 mm restored capacities up to 115.6%, significantly higher than the recovery range from 66.8% to 82.4% for 12 mm bars. Confinement raised the ultimate load marginally above control, of 5.4%, while unconfined beams recovered only 82.4%. Cementitious adhesives offered an economical repair option for moderate-demand applications; however, both bonding systems reduced ductility by up to 55.6% and energy absorption by up to 89.3%. Straight bars improved stiffness and ductility compared with hooked bars, while larger bar diameters of 16 mm reduced performance losses and enhanced stiffness. Confinement improved service stiffness and partially limited energy-absorption losses, although ductility remained below that of the control beam.
کلیدواژه‌ها
Repairing؛ Near-surface mounting (NSM)؛ Hooked bar configuration؛ Epoxy؛ Cementitious material؛ External bonding
مراجع
  1. Ivanova, I., Assih, J., Dontche, D. Repairing of short reinforced concrete corbel by bonding composite material under continuous load. In: 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures; 2019; Porto (PT). p. 1–6. doi:10.21012/FC10.235590.
  2. Cerullo, D., Sennah, K., Azimi, H., Lam, C., Fam, A., Tharmabala, B. Experimental Study on Full-Scale Pretensioned Bridge Girder Damaged by Vehicle Impact and Repaired with Fiber-Reinforced Polymer Technology. Journal of Composites for Construction, 2013; 17: 662–672. doi:10.1061/(ASCE)CC.1943-5614.0000383.
  3. Al-Rifaie, W. N., Ismaeel, N. N., Riyad, H. Rehabilitation of Damaged Reinforced Concrete Beams. IOSR Journal of Mechanical and Civil Engineering 2017; 14: 58–70. doi:10.9790/1684-1403065870
  4. Nounu, G., Chaudhary, Z.-U. L. H. Reinforced concrete repairs in beams. Construction and Building Materials, 1999; 13: 195–212. doi:10.1016/S0950-0618(99)00014-8.
  5. Fayyadh, M. M., Abdul Razak, H. Assessment of effectiveness of CFRP repaired RC beams under different damage levels based on flexural stiffness. Construction and Building Materials, 2012; 37: 125–134. doi:10.1016/j.conbuildmat.2012.07.021.
  6. Haddad, R. H., Al-Mekhlafy, N., Ashteyat, A. M. Repair of heat-damaged reinforced concrete slabs using fibrous composite materials. Construction and Building Materials, 2011; 25: 1213–1221. doi:10.1016/j.conbuildmat.2010.09.033.
  7. Elkhatib, L., Khatib, J., Fırat, S., El Hassan, H., Elkordi, A. Rehabilitation of Concrete Structures - A Review. Gazi University Journal of Science, 2025; 38: 665–685. doi:10.35378/gujs.1503207.
  8. Alaee, F. J., Karihaloo, B. L. Retrofitting of Reinforced Concrete Beams with CARDIFRC. Journal of Composites for Construction, 2003; 7: 174–186. doi:10.1061/(ASCE)1090-0268(2003)7:3(174).
  9. Sevil Yaman, T. Behaviour of precast concrete beams prestressed with CFRP strands. Građevinar, 2016; 68: 775–786. doi:10.14256/JCE.1624.2016.
  10. Mashreia, M. A., Makkia, J. S., Sultana, A. A. Flexural Strengthening of Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymer (CFRP) Sheets with Grooves. Latin American Journal of Solids and Structures, 2019; 16: e176. doi:10.1590/1679-78255514.
  11. Wu, H. C., Eamon, C. D. Strengthening of concrete structures using fiber reinforced polymers (FRP): design, construction and practical applications. 1st ed. Cambridge (UK): Woodhead Publishing; 2017.
  12. American Concrete Institute (ACI). ACI 440.2R-02: Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Farmington Hills (MI): ACI; 2005. doi:10.1061/40753(171)159.
  13. Mostofinejad, D., Esfahani, M. R., Shomali, A. Experimental and numerical study of the RC beams shear-strengthened with NSM technique. Journal of Composite Materials, 2019; 53: 2377–2389. doi:10.1177/0021998319830777.
  14. Mirabi Banadaki, H., Eslami, A., Ronagh, H. Near-surface-mounted retrofitting of damaged/undamaged adobe walls using steel bars: Analytical evaluation of experimental results. Structures, 2020; 28: 2111–2121. doi:10.1016/j.istruc.2020.10.020.
  15. Rahman, M., Jumat, M., Hosen, M. A., Islam, A. B. M. Effect of adhesive replacement with cement mortar on NSM strengthened RC Beam. Revista de la construcción, 2016; 15: 61–72. doi:10.4067/S0718-915X2016000100006.
  16. Mobin, M. N., Haque, M. F. Re-strengthening of reinforced concrete (RC) beam using near surface mounted (NSM) steel re-bars. In: 4th International Conference on Civil Engineering for Sustainable Development; 2018; Khulna (BD). p.
  17. Sabah, S., Hamza, D. Flexural behavior of reinforced concrete beams strengthened with hybrid Steel-FRP reinforcements by using near surface mounted technique. Journal of Applied Engineering Science, 2023; 21: 1–9. doi:10.5937/jaes0-39645.
  18. Kholil, M., Shakib, S., Rakib, M., Morshed, A. Finite element modeling of RC beams retrofitted with near surface mounted steel bars. 2023; 21: 1–9. doi:10.1063/5.0130156.
  19. Olajumoke, A. M., Dundu, M. Methods for flexural strengthening of reinforced concrete elements using steel plates. In: International Conference on Construction Materials and Structures; 2014; Johannesburg, (ZA). p. 1080–1085.
  20. Abuodeh, O. R., Abdalla, J. A., Hawileh, R. A. The flexural behavior of bolting and bonding Aluminum Alloy plates to RC beams. Procedia Structural Integrity, 2019; 17: 395–402. doi:10.1016/j.prostr.2019.08.052.
  21. Zhang, Y., Wang, H., Qin, Y., Huang, S., Fan, W. Experimental and analytical studies on the flexural behavior of steel plate-UHPC composite strengthened RC beams. Engineering Structures, 2023; 283: 115834. doi:10.1016/j.engstruct.2023.115834.
  22. Looney, T. J. Bond behavior of high-volume fly ash and self-consolidating concrete [Master Thesis]. Rolla (MO): Missouri University of Science and Technology; 2012.
  23. American Concrete Institute (ACI). ACI 318-19: Building code requirements for structural concrete and commentary. Framington Hills (MI): ACI 318-19; 2019.
  24. American Concrete Institute (ACI). ACI 211-91: Standard Practice for Selecting Proportions for Normal, Heavyweight and Mass Concrete. Framington Hills (MI): ACI; 1991.
  25. ASTM International. ASTM A615/A615M-24: Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement. West Conshohocken (PA): ASTM International; 2024. doi:10.1520/A0615_A0615M-24
  26. ASTM International. ASTM A370-17: Standard test methods and definitions for mechanical testing of steel products. West Conshohocken (PA): ASTM International; 2017. doi:10.1520/A0370-17
  27. ASTM International. ASTM A36/A36M-19: Standard Specification for Carbon Structural Steel. West Conshohocken (PA): ASTM International; 2019. doi:10.1520/A0036_A0036M-19
  28. ASTM International. ASTM C39/C39M-24: Standard test method for compressive strength of cylindrical concrete specimens. West Conshohocken (PA): ASTM International; 2024. doi:10.1520/C0039_C0039M-24
  29. ASTM International. ASTM C496/C496M-17: Standard test method for splitting tensile strength of cylindrical concrete specimens. West Conshohocken (PA): ASTM International; 2017. doi:10.1520/C0496_C0496M-17
  30. ASTM International. ASTM C78/C78M-22: Standard test method for flexural strength of concrete. West Conshohocken (PA): ASTM International; 2022. doi:10.1520/C0078_C0078M-22.
  31. Specifications and Guidelines for Self-Compacting Concrete. Flums, (CH): EFNARC; 2002.
  32. Park, R. Evaluation of ductility of structures and structural assemblages from laboratory testing. Bulletin of the New Zealand Society for Earthquake Engineering, 1989; 22: 155–166. doi:10.5459/bnzsee.22.3.155-166.
  33. Kristiawan, S., Supriyadi, A., Sangadji, S., Santosa, D. Cracking behaviour and its effect on the deflection of patched-reinforced concrete beam under flexural loading. In: MATEC web of conferences; 2017; p. 02021. doi:10.1051/matecconf/201713802021.
  34. Porter, N. M., Stallings, J. M. Flexural strengthening of reinforced concrete beams with externally bonded CFRP plates with lap splices. Highway Research Center Auburn University; 2001. Report No.:1.
  35. Hamed, T., Said, A. Shear Strength and Serviceability of GFRP-Reinforced Concrete Beams: A Study on Varying Reinforcement Ratios. Civil Engineering Journal, 2025; 11: 857–883. doi:10.28991/CEJ-2025-011-03-04.
  36. Jomaah, M. M., Ghaidan, D. J. Energy Absorption Capacity Of Layered Lightweight Reinforced Concrete Beams With Openings In Web. Civil Engineering Journal, 2019; 5: 690–701. doi:10.28991/cej-2019-03091279.
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