Shear Strengthening of Deep Beams Using Polymer-Based CFRP Bars via the Near-Surface Mounting (NSM) Technique
DOI:
https://doi.org/10.6000/1929-5995.2026.15.01Keywords:
Polymer, carbon fiber-reinforced polymer, Optimization, reinforcement concretAbstract
Near-surface-mounted strengthening with polymer-based carbon fiber-reinforced polymer (CFRP) bars has been proved as one of the efficient techniques in enhancing the shear capacity of reinforced concrete RC deep beams. This paper presents an experimental investigation on the shear behavior of RC deep beams strengthened with NSM CFRP bars. Five identical RC deep beam specimens with the same geometry and internal steel reinforcement were tested under two-point loading. One specimen was left un-strengthened as a control beam; while four specimens have been strengthened by CFRP bars embedded in the shear zone with two orientations, 0°/90° and 45°/135°, and two spacing configurations, 100 and 150 mm. Response parameters of prime interest included first shear cracking load, ultimate shear capacity, crack pattern, and mid-span deflection. The findings of the experiment demonstrated that NSM CFRP strengthening improved the shear performance of deep beams; depending on the orientation and spacing of the CFRP bars, shear capacity augmentation ranged from about 14% to 47% in comparison to the control specimen. Additionally, at similar load levels, strengthened beams demonstrated a 10% to 40% decrease in mid-span deflections and fracture widths. The test results demonstrate how well polymer-based CFRP bars inserted using the NSM technology improve the stiffness and shear strength of RC deep beams.
References
Rajgopal A, Karunakaran M. Advanced Functional Materials for Next-Generation Energy Storage and Conversion Technologies: Design Principles, Performance Enhancement Strategies, and Future Prospects. Journal of Research in Applied Chemistry 2026; 8(2).
Subramani R. Commercialization of additive manufacturing material extrusion process parameter selection and optimization-a solar absorber housing fabrication application. Journal of Mechanical Science and Technology 2025; 1-11. DOI: https://doi.org/10.1007/s12206-025-1246-6
Subramani R, Sekhar K, Dwivedi JN, Reddy Maddike R, Venkateswarlu V, Kumar AP. Explainable AI for Structure–Property Analysis of FDM-Printed Biodegradable Polymer Nanocomposites. Journal of Composites and Biodegradable Polymers 2025; 13: 202-209. DOI: https://doi.org/10.12974/2311-8717.2025.13.17
Li Y, Xu X, Ma L, Wang B. Direct two-scale finite element modeling of progressive failure in carbon fiber reinforced polymer composites with a localizing gradient damage model. Computers & Structures 2026; 321: 108087. DOI: https://doi.org/10.1016/j.compstruc.2025.108087
Raja S, Iliyas AJM, Vishnu PS, Rajan AJ, Rusho MA, Refaai MR, Adebimpe OA. Sustainable manufacturing of FDM-manufactured composite impellers using hybrid machine learning and simulation-based optimization. Materials Science in Additive Manufacturing 2025; 4(3): 025200033. DOI: https://doi.org/10.36922/MSAM025200033
Subramani R. Optimizing process parameters for enhanced mechanical performance in 3D printed impellers using graphene-reinforced polylactic acid (G-PLA) filament. Journal of Mechanical Science and Technology 2025; 1-11. DOI: https://doi.org/10.1007/s12206-025-0231-4
Elsupikhe FR, Abuissa MH, Alfazani ST, Elzawi FN. Production of AgNPs by Chemical Method in Seaweed Extracted Media. NanoNEXT 2025; 6(2): 1-5. DOI: https://doi.org/10.54392/nnxt2521
Sujitha VSN, Raja S. Synergistic enhancement of geopolymer concrete using graphene oxide and nano nickel oxide: RSM‐optimized multifunctional composites for sustainable infrastructure. Structural Concrete.
Vedhasakthi K, Chithra R. A Proposed Model and Performance Study on Prefabricated Cage-Reinforced Self-compacting Concrete Deep Beams. Iranian Journal of Science and Technology. Transactions of Civil Engineering 2025; 49(1): 73-103. DOI: https://doi.org/10.1007/s40996-024-01440-7
Akinnodi BO, Alabi OO, Aramide OF, Gbadamosi EY. Chemical and Mineralogical Characterization of Isanlu-Isin Columbite for Effective Beneficiation Towards Niobium Pentoxide Recovery. NanoNEXT 2025; 6(2): 6-13. DOI: https://doi.org/10.54392/nnxt2522
Padalu PKVR, Trivedi S, Gaulkar S, Vashisht R, Kumar V. Seismic retrofitting systems for unreinforced masonry from a rural community perspective: an overview. Iranian Journal of Science and Technology. Transactions of Civil Engineering 2025; 49(4): 3293-3363. DOI: https://doi.org/10.1007/s40996-024-01654-9
Rehman AU, Siddiqi ZA, Yasin M, Aslam HMS, Noshin S, Aslam HMU. Experimental study on the behavior of damaged CFRP and steel rebars RC columns retrofitted with externally bonded composite material. Advanced Composite Materials 2025; 34(1): 93-139. DOI: https://doi.org/10.1080/09243046.2024.2358262
Raja S, Jayalakshmi M, Rusho MA, Selvaraj VK, Subramanian J, Yishak S, Kumar TA. Fused deposition modeling process parameter optimization on the development of graphene enhanced polyethylene terephthalate glycol. Scientific Reports 2024; 14(1): 30744. DOI: https://doi.org/10.1038/s41598-024-80376-4
Raja S, Praveenkumar V. Optimizing additive manufacturing parameters for graphene-reinforced PETG impeller production: a fuzzy AHP-TOPSIS approach. Results in Engineering 2024; 24: 103018. DOI: https://doi.org/10.1016/j.rineng.2024.103018
Subramani R, Vijayakumar P, Rusho MA, Kumar A, Shankar KV, Thirugnanasambandam AK. Selection and optimization of carbon-reinforced polyether ether ketone process parameters in 3D printing—a rotating component application. Polymers 2024; 16(10): 1443. DOI: https://doi.org/10.3390/polym16101443
Al-Saadi NTK, Mohammed A, Al-Mahaidi R, Sanjayan J. A state-of-the-art review: Near-surface mounted FRP composites for reinforced concrete structures. Construction and Building Materials 2019; 209: 748-769. DOI: https://doi.org/10.1016/j.conbuildmat.2019.03.121
Zulfiqar N, Khalid F, Haleem A, Asad Ali M, Inam F. Role of Nano-based Plant Growth Regulators in Enhancing Essential Oil Yield and Agronomic Performance of Basil (Ocimum basilicum). NanoNEXT 2025; 6(3): 9-22. DOI: https://doi.org/10.54392/nnxt2532
Gupta S, Sharma A, Varma RK, Kushvaha V. A review on performance of near surface mounted-carbon fiber- reinforced polymer laminates bonded into slits. Polymer Composites 2022; 43(10): 6782-6802. DOI: https://doi.org/10.1002/pc.26795
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Policy for Journals/Articles with Open Access
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are permitted and encouraged to post links to their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work
Policy for Journals / Manuscript with Paid Access
Authors who publish with this journal agree to the following terms:
- Publisher retain copyright .
- Authors are permitted and encouraged to post links to their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work .
