Abstract
Several techniques were considered to retrofit the reinforced concrete members suffering damages or design mistakes. The present study investigates experimentally using a tightened bar system as an externally applied reinforcement installed straightly to provide additional strength to the partially or completely damaged concrete beams. The study involves testing 13 reinforced concrete beams classified into two groups based on the location of the externally applied reinforcement, either one bar installed beneath the lower face of the beam or two bars added to both sides of the beam. The study also investigates changing the loading ratio during the first stage of loading (40, 80, and 100) % of the ultimate load capacity of the control specimen. The third adopted parameter was the location of anchorage system devices for the beam edges, which was 10 cm or 25 cm. The results exhibited that the externally straight threaded tighten steel bar enhanced the ability of partially or completely damaged concrete beams to withstand additional loading in the range of (4–69) % above the original ultimate load capacity of the beam. Furthermore, the anchorage system on the bottom side of the beam was more efficient than the anchorage system on both sides.
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References
Kaur H, Singh J (2017) A review on external prestressing in concrete. Int Res J Eng Technol 4:1801–1805
Effiong JU, Ede AN (2022) Experimental investigation on the strengthening of reinforced concrete beams using externally bonded and near-surface mounted natural fibre reinforced polymer composites—a review. Materials 15(17):5848
Abdallah M, Al Mahmoud F, Boissiere R, Khelil A, Mercier J (2020) Experimental study on strengthening of RC beams with Side Near Surface Mounted technique-CFRP bars. Compos Struct 234:111716
Alkhateeb MY, Hejazi F (2022) Reinforced concrete beams externally strengthened by CFRP rods with steel plate, anchorage bolts, and concrete jacketing. In: Structures vol 46. Elsevier, pp. 1994–2013
Azeez AA, Jaafar AA, Yussof MM, Blash AAA (2023) Study of the behavior of reactive powder concrete RC deep beams by strengthening shear using near-surface mounted CFRP bars. Open Engineering 13(1):20220433
Nordin H (2005) Strengthening structures with externally prestressed tendons: literature review.
Naser AF, Zonglin W (2013) Evaluating the performance of skewed prestressed concrete bridge after strengthening. Cent Eur J Eng 3:329–347
Gul A, Alam B, Ahmed W, Wahab N, Shahzada K, Irfan Badrashi Y, Khan MNA (2021) Strengthening and characterization of existing Reinforced concrete beams for flexure by effective utilization of external steel elements. Adv Struct Eng 24(2):243–251
Lee SH, Shin KJ, Lee HD (2018) Post-tensioning steel rod system for flexural strengthening in damaged reinforced concrete (RC) beams. Appl Sci 8(10):1763
Lee SH, Shin KJ, Kang THK (2015) Flexural strengthening of continuous concrete beams using external prestressed steel bars. PCI J 60(1):68–86
Kwon SJ, Yang KH, Mun JH (2018) Flexural tests on externally post-tensioned lightweight concrete beams. Eng Struct 164:128–140
Mohamed GA, Eisa AS, Purcz P, Ručinský R, El-Feky MH (2022) Effect of external tendon profile on improving structural performance of RC beams. Buildings 12(6):789
Li Y, Li DY, Tian YY (2022) Model construction and simulation study on bending performance of strengthened RC beam in externally prestressing industrial reclaimed steel wire. Math Probl Eng. https://doi.org/10.1155/2022/8104602
El-Basiouny AM, Askar HS, El-Zoughiby ME (2021) Experimental and numerical study on the performance of externally prestressed reinforced high strength concrete beams with openings. SN Appl Sci 3:1–19
ASTM C150/C150M-20. (2020). Standard specification for Portland cement. ASTM: West Conshohocken, PA, USA.
British Standards Institution (B.S.8110) (1997) Code of Practice for Design and Construction. Part 1, London
ASTM C496/C496M (2011) Standard test method for splitting tensile strength of cylindrical concrete specimens. ASTM International, USA. p.1-5
ACI Committee 318 (2019) Building code requirements for structural concrete (ACI 318-19) and commentary (ACI 318R-19). American Concrete Institute, Farmington Hills, MI, USA,
Abu-Sena AB, Shaaban IG, Soliman MS, Gharib KAAM (2020) Effect of geometrical properties on strength of externally prestressed steel–concrete composite beams. Proc Inst Civil Eng Struct Build 173(1):42–62
Park R (1988) Ductility evaluation from laboratory and analytical testing. In: Proceedings of the 9th world conference on earthquake engineering, vol 8. Tokyo-Kyoto Japan, pp 605–616
Shaaban IG, Shaheen YB, Elsayed EL, Kamal OA, Adesina PA (2018) Flexural characteristics of lightweight ferrocement beams with various types of core materials and mesh reinforcement. Constr Build Mater 171:802–816. https://doi.org/10.1016/j.conbuildmat.2018.03.167
Shaaban IG, Shaheen YB, Elsayed EL, Kamal OA, Adesina PA (2018) Flexural behaviour and theoretical prediction of lightweight ferrocement composite beams. Case Stud Constr Mater 9:e00204. https://doi.org/10.1016/j.cscm.2018.e00204
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by [AAA], [MAH], and [HAAT]. The first draft of the manuscript was written by [AAA], and all authors commented on previous versions. All authors read and approved the final manuscript.
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Alalikhan, A.A., Habelalmateen, M.A. & Al-Tameemi, H.A. Retrofitting of the reinforced concrete beams using external tightened steel bars. J Build Rehabil 9, 38 (2024). https://doi.org/10.1007/s41024-024-00389-4
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DOI: https://doi.org/10.1007/s41024-024-00389-4