Axial and Flexural Strength of Square RC Columns with No-rounded Corners Wrapped with CFRP under Eccentric Loading
This paper presents the results of a study on the axial and flexural strength of reinforced concrete (RC) columns with no-rounded corners wrapped with Carbon Fiber Reinforced Polymer (CFRP) under eccentric loading based on an experimental program. The main parameters under investigation are the number of layers of CFRP wrap. Thirty-six concrete cylinders with a standard size of (150×300) mm were cast and tested in this study to get the modulus of elasticity and compressive strength of concrete. Of these 36 concrete cylinders were divided into four groups, unwrapped, wrapped with one layer of CFRP, wrapped with two layers of CFRP, and wrapped with three layers of CFRP. Twelve rectangular reinforced concrete columns were also cast and tested in this study. The column specimens had dimensions (75×75×750) mm with no-rounded corners of the column section. The column specimens were also divided into four groups, unwrapped, wrapped with one layer of CFRP, wrapped with two layers of CFRP, and wrapped with three layers of CFRP. The experiment results show that the load-carrying capacity of the wrapped column increased by the increasing number of CFRP layers. Comparing the experimental results with the compressive strength concrete and the maximum load-carrying capacity of wrapped RC Column predicted by the theories proposed by several researchers with the concern of no-rounded corners were also presented.
M. I. Ary and T. H. K. Kang, “Shear-strengthening of reinforced and pre-stressed concrete beams using FRP: Part I-review of previous research,” International Journal of Concrete Structures and Materials, vol. 6, no. 1, pp. 41-47, March 2012.
T. H. K. Kang, J. Howell, S. Kim, and D. J. Lee, “A state-of-the art review on debonding failures of FRP laminates externally adhered to concrete,” International Journal of Concrete Structures and Materials, vol. 6, no. 2, pp. 123-134, June 2012.
R. He, L. H. Sneed, and A. Belarbi, “Rapid repair of severely damaged RC columns with different damage conditions: an experimental study,” International Journal of Concrete Structures and Materials, vol. 7, no. 1, pp. 35-50, March 2013.
A. Mofidi and O. Chaallal, “Tests and design provisions for reinforced-concrete beams strengthened in shear using FRP sheets and strips,” International Journal of Concrete Structures and Materials, vol. 8, no. 2, pp. 117-128, June 2014.
S. F. Brena and G. N. McGuirk, “Advances on the behavior characterization of FRP-anchored carbon fiber-reinforced polymer (CFRP) sheets used to strengthen concrete elements,” International Journal of Concrete Structures and Materials, vol. 7, no. 1, pp. 3-16, March 2013.
L. Lam and J. G. Teng, “Strength model for fiber-reinforced plastic-confined concrete,” Journal of Structural Engineering, vol. 128, no. 5, pp. 612-623, May 2002.
J. G. Teng and L. Lam, “Behavior and modeling of fiber reinforced polymer-confined concrete,” Journal of Structural Engineering, vol, 130, no. 11, pp. 1713-1723, November 2004.
R. Kumutha, R. Yaidyanathan, and M. S. Palanichamy, “Behaviour of reinforced concrete rectangular columns strengthening using GFRP,” Cement and Concrete Composites, vol. 29, no. 8, pp. 609-615, September 2007.
T. C. Rousakis, A. I. Karabinis, and P. D. Kiousis, “FRP-confined concrete members: axial compression experiments and plasticity modeling,” Engineering Structures, vol. 29, no. 7, pp. 1343-1353, July 2007.
L. M. Wang and Y. F. Wu, “Effect of corner radius on the performance of CFRP-confined square concrete columns: tests,” Engineering Structures, vol. 30, no. 2, pp. 493-505, February 2008.
J. Li and M. N. S. Hadi, “Behaviour of externally confined high strength concrete columns under eccentric loading,” Composite Structures, vol. 62, no. 2, pp. 145-153, November 2003.
M. N. S. Hadi, “Behaviour of FRP wrapped normal strength concrete columns under eccentric loading,” Composite Structures, vol. 72, no. 4, pp. 503-511, April 2006.
M. N. S. Hadi, “Comparative study of eccentrically loaded FRP wrapped columns,” Composite Structures, vol. 74, no. 2, pp. 127-135, July 2006.
L. Bisby and M. Ranger, “Axial-flexural interaction in circular FRP-confined reinforced concrete columns,” Construction Building Materials, vol. 24, no. 9, pp. 1672-1681, September 2010.
A. Parvin and W. Wang, “Behavior of FRP jacketed concrete columns under eccentric loading,” Journal of Composites for Construction, vol. 5, no. 3, pp. 146-152, August 2001.
T. E. Maaddawy, “Strengthening of eccentrically loaded reinforced concrete columns with fiber-reinforced polymer wrapping system,” Journal of Composites for Construction, vol. 13, no. 1, pp. 13-24, February 2009.
M. N. S. Hadi and I. B. R. Widiarsa, “Axial and flexural performance of square RC columns wrapped with CFRP under eccentric loading,” Journal of Composites for Construction, vol. 16, no. 6, pp. 640-649, December 2012.
L. S. D. Santos, I. I. R. Damasceno, L. C. N. Ribeiro, and D. R. C. D. Oliviera,”Rounded corners columns strengthened with CFRP,” Acta Scientiarum Technology, vol. 35, no. 3, pp. 463-468, July-September 2013.
SNI 2847-2013, “Building Code Requirement for Structural Concrete,” Badan Standardisasi Nasional (BSN), Jakarta, 2013.
ASTM, American society for testing and materials annual book of ASTM standards, vol. 04.09, West Conshohocken, PA, 2008.
F. E. Richart, A. Brandtzaeg, and R. L. Brown, “A study of the failure of concrete under combined compressive stresses,” Univ. of Illinois. Engineering Experiment Station. Bulletin, Technical Report, 1928.
J. G. Teng, J. F. Chen, S. T. Smith, and L. Lam, FRP-strengthened RC structures, West Sussex; John Wiley & Sons Inc., 2002.
L. Lam and J. G. Teng, “Design-oriented stress-strain model for FRP-confined concrete in rectangular columns,” Journal of Reinforced Plastics and Composites, vol. 22, no. 13, pp. 1149-1186, September 2003.
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