Stress–strain relationship of ductile materials and flexural behavior of ductile over-reinforced concrete beams

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Hussein M. DUHAIM
Mohammed A. MASHREI

Keywords : ductile materials, SFRC, SIFCON, UHPFRC, over-reinforced beam, flexural behavior, ductility

This paper aimed to investigate the effect of using ductile materials in the compression zone on the flexural performance of over-reinforced concrete beams. In order to avoid brittle compression failure, partial replacement of concrete with ductile materials layer in the compression zone was used. Four over-reinforced concrete beams of size 120 × 180 × 1,300 mm were cast and tested under three-point loading conditions. The steel fibers reinforced concrete (SFRC), slurry infiltrated fiber concrete (SIFCON), and ultra-high performance fiber reinforced concrete (UHPFRC) were used as ductile materials. The flexural capacity of the beams, failure modes, crack patterns, load-deflection relationships, ductility index, and toughness were investigated. The results showed that using ductile materials in the compression zone is an effective technique to increase the ultimate load, ductility, and toughness by up to 52.46, 84.78 and 279.93%, respectively, compared to the reference beam. In addition, the failure mode changed from brittle to ductile failure. Noting that the use of SFRC layer enhanced the ductility of over-reinforced concrete beams more than using UHPFRC and SIFCON layers. Also, one of the main advantages of this technique is led to increase the tensile reinforcement ratio up to 8.548% without needing the compressive reinforcement. Thus, ductile composite beams with a high flexural capacity were generated using an economical amount of ductile materials.

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DUHAIM, H. M., & MASHREI, M. A. (2022). Stress–strain relationship of ductile materials and flexural behavior of ductile over-reinforced concrete beams. Scientific Review Engineering and Environmental Sciences (SREES), 31(4), 225–237.

Abeer, S. Z., Dawood, M. B. & Ghalib, M. H. (2020). Flexural behavior of continuous beams consisting of normal concrete and SIFCON under static and repeated loads. IOP Conference Series: Materials Science and Engineering, 870 (1), 1–14. (Crossref)

Ahmed, M. M., Farghal, O. A., Nagah, A. K. & Haridy, A. A. (2007). Effect of confining method on the ductility of over-reinforced concrete beams. Journal of Engineering Sciences, 35 (3), 617–633. (Crossref)

Alasadi, S., Shafigh, P. & Ibrahim, Z. (2020). Experimental study on the flexural behavior of over reinforced concrete beams bolted with compression steel plate: Part I. Applied Sciences (Switzerland), 10 (3), 1–20. (Crossref)

Ali, A. M. & Tarkhan, M. A. (2015). Experimental investigation of confining the compression zone in over-reinforced beams. International Journal of Engineering Sciences and Research Technology, 4 (11), 611–617.

American Association State Highway and Transportation [ASTM] (2015). Standard specification for deformed and plain carbon-steel bars for concrete reinforcement (ASTM A615/A615M). Washington: American Association State Highway and Transportation.

American Concrete Institute [ACI] (2014). Building code requirements for structural concrete (ACI 318). Farmington Hills: American Concrete Institute.

Atta, A. M. & Khalil, A. E. H. (2016). Improving the failure mode of over-rinforced concrete beams using strain-hardening cementitious composites. Journal of Performance of Constructed Facilities, 30 (5), 04016003. (Crossref)

Balaji, S. & Thirugnanam, G. S. (2018). Behaviour of reinforced concrete beams with SIFCON at various locations in the beam. KSCE Journal of Civil Engineering, 22 (1), 161–166. (Crossref)

Deng, M., Ma, F., Ye, W. & Li, F. (2018). Flexural behavior of reinforced concrete beams strengthened by HDC and RPC. Construction and Building Materials, 188, 995–1006. (Crossref)

Deng, M., Zhang, M., Ma, F., Li, F. & Sun, H. (2021). Flexural strengthening of over-reinforced concrete beams with highly ductile fiber-reinforced concrete layer. Engineering Structures, 231, 111725. (Crossref)

Germano, F., Plizzari, G. A. & Tiberti, G. (2013). Experimental study on the behavior of SFRC columns under seismic loads. In J. G. M. Van Mier, G. Ruiz, C. Andrade, R. C. Yu & X. X. Zhang (Eds). Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-8 (pp. 1171–1182). Barcelona: Cimne.

Khalil, W. I. & Tayfur, Y. R. (2013). Flexural strength of fibrous ultra high performance reinforced concrete beams. ARPN Journal of Engineering and Applied Sciences, 8 (3), 200–214.

Khamees, S. S., Kadhum, M. M. & Alwash, N. A. (2020). Effects of steel fibers geometry on the mechanical properties of SIFCON concrete. Civil Engineering Journal (Iran), 6 (1), 21–33. (Crossref)

Kobayashi, K. (1976). Steel Fiber Reinforced Concrete. Zairyo/Journal of the Society of Materials Science, Japan, 25 (277), 937–945. (Crossref)

Liu, K. & Wu, Y. F. (2007). Compression yielding by sifcon block for FRP-reinforced concrete beams. Proceedings of the 1st Asia-Pacific Conference on FRP in Structures, 1, 411–416.

Mohamed, H. A. (2018). Improvement in the ductility of over-reinforced NSC and HSC beams by confining the compression zone. Structures, 16 (2), 129–136. (Crossref)

Orouji, M., Zahrai, S. M. & Najaf, E. (2021). Effect of glass powder & polypropylene fibers on compressive and flexural strengths, toughness and ductility of concrete: an environmental approach. Structures, 33, 4616–4628. (Crossref)

Pam, H. J., Kwan, A. K. H. & Islam, M. S. (2001). Flexural strength and ductility of reinforced normal- and high-strength concrete beams. Proceedings of the Institution of Civil Engineers: Structures and Buildings, 146 (4), 381–389. (Crossref)

Park, R. (1989). Evaluation of ductility of structures and structural assemblages from laboratory testing. Bulletin of the New Zealand Society for Earthquake Engineering, 22 (3), 155–166. (Crossref)

Priastiwi, Y. A., Imran, I., Nuroji & Hidayat, A. (2014). Behavior of ductile beam with addition confinement in compression zone. Procedia Engineering, 95, 132–138. (Crossref)

Qadir, H. H., Faraj, R. H., Sherwani, A. F. H., Mohammed, B. H. & Younis, K. H. (2020). Mechanical properties and fracture parameters of ultra high performance steel fiber reinforced concrete composites made with extremely low water per binder ratios. SN Applied Sciences, 2(9), 1594. (Crossref)

Salih, S., Frayyeh, Q. & Ali, M. (2018). Fresh and some mechanical properties of sifcon containing silica fume. MATEC Web of Conferences, 162, 1–7. (Crossref)

Shelorkar, A. P. (2021). Slurry Infiltrated Fibrous Concrete (SIFCON) – a review. International Journal of Research Publication and Reviews, 2 (8), 780–787.

Siddiqi, Z. A. (2016). Concrete Structures. Part 1 (3rd ed.). Lahore: Help Civil Engineering Publisher.

Tee, H. H., Al-Sanjery, K. & Chiang, J. C. L. (2017). Behaviour of reinforced concrete beams with confined concrete related to ultimate bending and shear strength. AIP Conference Proceedings, 1, 020060. (Crossref)

Whitehead, P. A. & Ibell, T. J. (2004). Deformability and ductility in over-reinforced concrete structures. Magazine of Concrete Research, 56 (3), 167–177. (Crossref)

Wu, Y. F. (2008). Ductility demand of compression yielding fiber-reinforced polymer-reinforced concrete beams. ACI Structural Journal, 105 (1), 104–110. (Crossref)

Ziara, M. M., Haldane, D. & Hood, S. (2000). Proposed changes to flexural design in BS 8110 to allow over-reinforced sections to fail in a ductile manner. Magazine of Concrete Research, 52 (6), 443–454. (Crossref)



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