International journal of

ADVANCED AND APPLIED SCIENCES

EISSN: 2313-3724, Print ISSN:2313-626X

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 Volume 5, Issue 11 (November 2018), Pages: 61-66

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 Original Research Paper

 Title: Nonlinear analysis of RC deep beams strengthened with NSM CFRP anchor bars

 Author(s): Douread R. Hassen 1, 2, *, Abdul Aziz Abdul Samad 1, Noridah Mohamad 1, Ali N. Attiyah 2, Thaer M. Mezher 2, Alyaa A. Azeez 1, 2

 Affiliation(s):

 1Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Malaysia
 2Faculty of Civil Engineering, University of Kufa, Kufa, Iraq

 https://doi.org/10.21833/ijaas.2018.11.008

 Full Text - PDF          XML

 Abstract:

Studies on the effect of using externally bonded fiber reinforced polymer (FRP) laminates and near surface mounted (NSM) FRP bars on the shear strengthening of reinforced concrete (RC) beams has been widely conducted by various researchers globally. However, an innovative technique using NSM CFRP as anchor bars on the shear strengthening of RC deep beams has never been conducted. Current experimental work on NSM anchor bars has shown good enhancement in the shear capacity for the RC deep beams. This paper presents results obtained from the analytical model of the RC deep beams shear strengthened by NSM CFRP Anchor bars. The study comprises of developing four analytical models using finite element method software ANSYS Version 14. Results of the analytical model and experimental findings were compared for validation. All deep beams were simply supported and subjected to four point bending test with shear span to depth ratio av/d of 0.864. CFRP NSM bars of 5 mm diameter with 450 mm length and spaced at 100 mm (for beams R1 and R2) and 150 mm (for beams R3 and R4) were anchors into their respective beams. Similar properties from the experimental work were adopted for the analytical model. Results from the analytical model such as crack pattern, failure mode and load displacement profile were observed to have good agreement with the experimental findings. Shear capacity shows proximity between the analytical model and experimental results observed at 15 % for beams R1 and R2, and 7 % for beams R3 and R4. 

 © 2018 The Authors. Published by IASE.

 This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

 Keywords: RC deep beam, CFRP, NSM, ANSYS

 Article History: Received 15 October 2017, Received in revised form 28 August 2018, Accepted 15 September 2018

 Digital Object Identifier: 

 https://doi.org/10.21833/ijaas.2018.11.008

 Citation:

 Hassen DR, Samad AAA, and Mohamad N et al. (2018). Nonlinear analysis of RC deep beams strengthened with NSM CFRP anchor bars. International Journal of Advanced and Applied Sciences, 5(11): 61-66

 Permanent Link:

 http://www.science-gate.com/IJAAS/2018/V5I11/Hassen.html

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 References (19) 

  1. Al-Zaid RZ, Al-Negheimish AI, Al-Saawani MA, and El-Sayed AK (2012). Analytical study on RC beams strengthened for flexure with externally bonded FRP reinforcement. Composites: Part B: Engineering, 43(2): 129-141. https://doi.org/10.1016/j.compositesb.2011.11.015   [Google Scholar]
  1. Barros JAO, Dias SJE, and Lima JLT (2007). Efficacy of CFRP-based techniques for the flexural and shear strengthening of concrete beams. Cement and Concrete Composites, 29(3): 203-217. https://doi.org/10.1016/j.cemconcomp.2006.09.001   [Google Scholar]
  1. Camata G, Spacone E, and Zarnic R (2007). Experimental and nonlinear finite element studies of RC beams strengthened with FRP plates. Composites: Part B: Engineering, 38(2): 277–288. https://doi.org/10.1016/j.compositesb.2005.12.003   [Google Scholar]
  1. Ehsan A, Habibur RS, and Norsuzailina MS (2011). Flexural performance of CFRP strengthened RC beams with different degrees of strengthening schemes. International Journal of the Physical Sciences, 6(9): 2229-2238.   [Google Scholar]
  1. El-Ghandour AA (2011). Experimental and analytical investigation of CFRP flexural and shear strengthening efficiencies of RC beams. Construction and Building Materials, 25(3): 1419-1429. https://doi.org/10.1016/j.conbuildmat.2010.09.001   [Google Scholar]
  1. Godat A, Qu Z, Lu XZ, Labossiere P, Ye LP, and Neale KW (2010). Size effects for reinforced concrete beams strengthened in shear with CFRP strips. Journal of Composites for Construction, 14(3): 260-271. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000072   [Google Scholar]
  1. Ibrahim AM and Mahmood MS (2009). Finite Element Modeling of Reinforced Concrete beams strengthened with FRP laminates. European Journal of Scientific Research, 30(4): 526-541.   [Google Scholar]
  1. Islam MR, Mansur MA, and Maalej M (2005). Shear strengthening of RC deep beams using externally bonded FRP systems. Cement and Concrete Composites, 27(3): 413–420. https://doi.org/10.1016/j.cemconcomp.2004.04.002   [Google Scholar]
  1. Khalifa A, Gold WJ, Nanni A, and Abdel Aziz MI (1998). Contribution of externally bonded FRP to shear capacity of RC flexural members. ASCE Journal for Composite of Construction, 2(4): 195-202. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:4(195)   [Google Scholar]
  1. Maaddawy ET and Sherif S (2009). FRP composites for shear strengthening of reinforced concrete deep beams with openings. Composite Structures, 89(1): 60-69. https://doi.org/10.1016/j.compstruct.2008.06.022   [Google Scholar]
  1. Mofidi A, Thivierge S, Chaallal O, and Shao Y (2013). Behavior of reinforced concrete beams strengthened in shear using L-shaped CFRP plates: Experimental investigation. Journal of Composites for Construction, 18(20): 0401-3033.   [Google Scholar]
  1. Rabinovich O and Frostig Y (2000). Closed-form high-order analysis of RC beams strengthened with FRP strips. Journal of Composites for Construction, 4(2): 65-74. https://doi.org/10.1061/(ASCE)1090-0268(2000)4:2(65)   [Google Scholar]
  1. Rahimi H and Hutchinson A (2001). Concrete beams strengthened with externally bonded FRP plates. Journal of Composites for Construction 5(1): 44-56. https://doi.org/10.1061/(ASCE)1090-0268(2001)5:1(44)   [Google Scholar]
  1. Samad AAA, Hassen DR, Mohamad N, Attiyah AN, Jayaprakash J, and Mendis P (2017). Shear rehabilitation of RC deep beams using NSM CFRP anchor bars. In the International Symposium on Civil and Environmental Engineering (MATEC Web of Conferences), EDP Sciences, 103: 02010. https://doi.org/10.1051/matecconf/201710302010   [Google Scholar]
  1. Santhakumar R, Dhanaraj R, and Chandrasekaran E (2007). Behaviour of retrofitted reinforced concrete beams under combined bending and torsion: A numerical study. Electronic Journal of Structural Engineering, 7: 1-7.   [Google Scholar]
  1. Supaviriyakit T, Pornpongsaroj P, and Pimanmas A (2004). Finite element analysis of FRP-strengthened RC beams. Songklanakarin Journal of Science and Technology, 26(4): 497-507.   [Google Scholar]
  1. Tavarez FA, Bank LC, and Plesha ME (2003). Analytical of fiber-reinforced polymer composite grid reinforced concrete beams. ACI Structural Journal, 100(2): 250-258.   [Google Scholar]
  1. Yang ZJ, Chen JF, and Proverbs D (2003). Finite element modelling of concrete cover separation failure in FRP plated RC beams. Construction and Building Materials, 17(1): 3-13. https://doi.org/10.1016/S0950-0618(02)00090-9   [Google Scholar]
  1. Zhang Z, Hsu CTT, and Moren J (2004). Shear strengthening of reinforced concrete deep beams using carbon fiber reinforced polymer laminates. Journal of Composites for Construction, 8(5): 403-414. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:5(403)   [Google Scholar]