Volume 3, Issue 3, June 2018, Page: 64-77
Behavior of Axially Loaded CFRP Confined Large-Scale Capsule-Shaped RC Short Columns with Higher Cross-Sectional Aspect Ratio
Abd El Rahman Megahid Ahmed, Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
Omar Ahmed Farghal, Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
Walied Ahmed Bazar, Civil Engineering Department, Hadhramout University, Hadhramout, Yemen
Received: Jul. 4, 2018;       Accepted: Jul. 12, 2018;       Published: Aug. 7, 2018
DOI: 10.11648/j.jccee.20180303.13      View  907      Downloads  64
This paper aimed to experimentally and analytically investigate the behavior of reinforced concrete (RC) short capsule-shaped columns confined with carbon fiber-reinforced polymer (CFRP) sheets. The efficiency of FRP-confined strengthening system depends mainly on different encountered parameters such as the FRP confinement ratio, shape and size of cross-section, and cross sectional aspect ratio of non-circular columns. The effects of varying the aspect ratio (h/b=2, 2.5, 3 and 4), FRP confinement ratio (number of FRP layers), and FRP-wrapping configuration (full and partial system) are examined in this study. The experiment results showed that the efficiency of FRP confined system was proven to be lower with higher aspect ratio than that with the lower aspect ratio. Confinement by CFRP sheets enhances the performance of capsule-shaped RC columns subjected to axial compressive loads, and it is an efficient technique to improve the strength and ductility of capsule shaped RC columns regardless the cross sectional aspect ratio and the type of confinement. Analytical model was proposed by the authors to predict the axial load carrying capacity of short capsule-shaped reinforced concrete columns. The proposed model is compared with the existing model, showing good agreement with the experimental results and it is improved performance and gives reasonable predictions of load carrying capacity of FRP-confined columns.
Capsule-Shaped, Axial Load, Aspect Ratio, Short Column, CFRP
To cite this article
Abd El Rahman Megahid Ahmed, Omar Ahmed Farghal, Walied Ahmed Bazar, Behavior of Axially Loaded CFRP Confined Large-Scale Capsule-Shaped RC Short Columns with Higher Cross-Sectional Aspect Ratio, Journal of Civil, Construction and Environmental Engineering. Vol. 3, No. 3, 2018, pp. 64-77. doi: 10.11648/j.jccee.20180303.13
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
ACI Committee 440 (2008), Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures, (ACI 440. 2R-08 (2008)), American Concrete Institute, Farmington Hills, MI.
Chaallal, O., Shahawy, M., Hassan, M. (2003), Performance of axially loaded short rectangular columns strengthened with Carbon fiber-reinforced polymer wrapping, J. of Compos. Constr., 7(3), 200-208.
Harajli, M. H. (2006), axial stress-strain relationship for FRP confined circular and rectangular concrete columns, Cement & Contraction Composites, 28, 938-948.
Ilki A, Peker O, Karamuk E, Demir C, Kumbasar. N, (2008), FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns, J Mater Civil Eng. 20(2):169–188.
Lam L and Teng JG (2003a), Design-oriented stress–strain model for FRP-confined concrete in rectangular columns, Journal of Reinforced Plastics and Composites 22(13): 1149–1186.
Rochette, P.; Labossiere, P. (2000), Axial testing of rectangular columns models confined with composites, Journal of Composites for Construction, ASCE, vol. 4, no. 3, pp. 129-136.
Tao, Z & Zhong YZ, (2008), Compressive behaviour of CFRP-confined rectangular concrete columns. Magazine of Concrete Research, vol. 60, no. 10, pp. 735-745.
Wu, Y.-F. and Y.-Y. Wei, (2010), Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns, Engineering Structures 32(1): 32-45.
Triantafillou TC, Choutopoulou E, Fotaki E et al. (2016), FRP confinement of wall like reinforced concrete columns, Materials and Structures 49(1): 651–664.
Saravanan S, Sakthieswaran N, Shiny Brintha G, (2015), A Study on Hybrid FRP Wrapped Axially Loaded RC Capsule Column, International Journal of Research in Advent Technology, Vol. 3, No. 6, June.
Tan K. H, T. Bhowmik, et al (2013), Confinement model for FRP-bonded capsule-shaped concrete columns, Engineering Structures 51, 51-59.
SIKA (2006); Technical Report: Prouduct Data Sheet, Edition 2006.
Megahid A., Farghal Omar A., Mohamed M., and Bazar W., (2018), Effect of Cross-Sectional Aspect ratio on the Behavior of CFRP-Confined Rectangular Reinforced Concrete Columns, Proceedings of the Second International Conference on Multidisciplinary Research (ICMR), Faculty of Science, Assiut University, Assiut, Egypt, 28-30 January.
Wang, Lei-Ming and Wu, Yu Fei (2008), Effect of corner radius on the performance of CFRP-confined square concrete columns, Engineering Structures, 30, 493-505.
Rocca S, Galati N and Nanni A (2008), Experimental evaluation of non-circular reinforced concrete columns strengthened with CFRP, ACI Structural Journal 258(SP3): 37–56.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988a), Observed Stress-Strain Behaviour of Confined Concrete, Journal of Structural Engineering, 114(8), 1827-1849.
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