Size Effect of Concrete Short Columns Confined with Aramid FRP Jackets
Publication: Journal of Composites for Construction
Volume 15, Issue 4
Abstract
Most previous studies on concrete short columns confined with fiber-reinforced polymer (FRP) composites were based on small-scale testing, and size effect of the columns still has not been studied thoroughly. In this study, 99 confined concrete short columns wrapped with aramid FRP (AFRP) jackets and 36 unconfined concrete short columns with circular and square cross sections were tested under axial compressive loading. The circular specimens were divided into six groups, and the square specimens were divided into five groups, with each group containing different levels of the AFRP’s confinement. In each group, the specimens were geometrically similar to one another and had three different scaling dimensions. Statistical analyses were used to evaluate the size and interaction effects between the specimen size and the AFRP’s confinement, and a size-dependent model for predicting the strength of the columns was developed by modifying Bazănt’s size-effect law. The experimental results showed that the size of a specimen had a significant effect on the strength of AFRP-confined concrete short columns, lesser effect on the axial stress-strain curves, and slight effect on the failure modes. The modified Bazănt model was in good agreement with the experimental data.
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Acknowledgments
The authors acknowledge the financial support provided by the National Natural Science Foundation of China under Grant No. NNSFC50378002 and by the Science and Technology Program for Western Transportation Construction of the Ministry of Communications of China under Grant No. UNSPECIFIED200431800058. The authors are grateful to Beijing Jiaotong University and China Railway Co. Laboratory for the use of their testing facilities and to Shenzhen Ocean Power Engineering Technology Co., Ltd., who contributed the AFRP materials.
References
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI-440, ACI-440 Committee, Detroit.
Bazănt, Z. P. (1984). “Size effect in blunt fracture: Concrete, rock, metal.” J. Eng. Mech., 110(4), 518–535.
Bazănt, Z. P., and Kwon, Y. W. (1994). “Failure of slender and stocky reinforced concrete columns: Tests of size effect.” Mater. Struct., 27(2), 79–90.
Canadian Standard Association (CSA). (2002). “Design and construction of building components with fibre-reinforced polymers.” CSA-S806-2002, Rexdale BD, Toronto.
Carey, S. A., and Harries, K. A. (2005). “Axial behavior and modeling of confined small-, medium-, and large-scale circular sections with carbon fiber-reinforced polymer jackets.” ACI Struct. J., 102-S61(4), 596–604.
Elkadi, A. S., and van Mier, J. G. M. (2006). “Experimental investigation of size effect in concrete fracture under multiaxial compression.” Int. J. Fract., 140(4), 55–71.
Gonnerman, H. F. (1925). “Effect of size and shape of test specimen on compressive strength of concrete.” Proc., ASTM, West Conshohocken, PA, 237–250.
Gu, X., Li, Y., Zhang, W., and Ouyang, Y. (2006). “Compressive stress-strain relationship of concrete confined by carbon fiber composites sheets.” Struct. Eng., 22(2), 50–56 (in Chinese).
Jia, M.-Y., and Cheng, H. (2003). “Experimental research of size effect of RC circular columns reinforced by CFRP.” Build. Sci. Res. Sichuan, 29(1), 35–36 (in Chinese).
Kim, J. K., Yi, S. T., Park, C. K., and Eo, S. H. (1998). “Size effect on compressive strength of plain and spirally reinforced concrete cylinders.” ACI Struct. J., 96(1), 88–94.
Koike, S., Hatanaka, S., Mizuno, E., and Tanigawa, Y. (2000). “Size effect on compressive behavior of normal and high-strength confined concrete.” J. Struct. Constr. Eng., AIJ, 538, 131–138 (in Japanese).
Lejano, B. A., Adachi, H., Shirai, N., Nakanishi, M., Tanaka, K., and Yagenji, A. (1993). “Size effect on stress-strain characteristics of high strength reinforced concrete columns confined by lateral reinforcement.” Size effect in concrete structures, E & FN Spon, London.
Lin, Chih-Tsung., and Li, Yeou-Fong. (2003). “An effective peak stress formula for concrete confined with carbon fiber reinforced plastics.” Can. J. Civ. Eng., 30, 882–889.
Lorenzis, L. D., Micelli, F., and Tegola, A. L. (2002). “Influence of specimen size and resin type on the behavior of FRP-confined concrete cylinders.” Proc., Advanced Composites for Structural Applications in Construction (ACIC-2002), Univ. of Southampton, Southampton, UK, 46–53.
Masia, M. J., Gale, T. N., and Shrive, N. G. (2004). “Size effects in axially loaded square-section concrete prisms strengthened using carbon fibre reinforced polymer wrapping.” Can. J. Civ. Eng., 31, 1–13.
Mirmiran, A., Shahawy, M., Samaan, M., Echary, H. E., Mastrapa, J. C., and Pico, O. (1998). “Effect of column parameters on FRP-confined concrete.” J. Compos. Constr., 2(4), 175–185.
Miyaushi, K., Nishibayashi, S., and Inous, S. (1997). “Estimation of strengthening effects with carbon fiber sheet for concrete column.” Proc., 3rd Int. Symp. on Non-Metallic (FRP) Reinforcement for Concrete Structures, Japan Concrete Institute, Tokyo, 27–32.
Montgomery, D. C. (1983). Design and analysis of experiments, 2nd Ed., Wiley, New York.
Owen, L. M. (1998). “Stress-strain behavior of concrete confined by carbon fiber jacketing.” M.S. thesis, Univ. of Washington, Seattle.
Peng, P., et al. (1998). “A study on the size effect of concrete strength confined by CFRP.” Ind. Mater., 142, 129–134 (in Chinese).
Rochette, P., and Labossiere, P. (2000). “Axial testing of rectangular column models confined with composites.” J. Compos. Constr., 4(3), 129–136.
Şener, S., Barr, B. I. G., and Abusiaf, H. F. (2004). “Size effect in axially loaded reinforced concrete columns.” J. Struct. Eng., 130(4), 662–670.
Shehata, I. M. E. M., Carneiro, L. A. V., and Shehata, L. C. D. (2002). “Strength of short concrete columns confined with CFRP sheets.” Mater. Struct., 35(1), 50–58.
Silva, M. A. G., and Rodrigues, C. C. (2006). “Size and relative stiffness effects on compressive failure of concrete columns wrapped with glass FRP.” J. Mater. Civ. Eng., 18(3), 334–342.
Teng, J. G., Chen, J. F., and Lam, L. (2002). FRP-strengthened RC structures, Wiley, London.
Théiault, M., Neale, K. W., and Claude, S. (2004). “Fiber-reinforced polymer-confined circular concrete columns: Investigation of size and slenderness effects.” J. Compos. Constr., 8(4), 323–331.
Tong, G. S., Liu, Y. S., and Wu, Q. L. (2009). “Size effect on square section column concrete confined with basalt fiber sheets.” Concrete, 233, 6–8 (in Chinese).
Wu, H.-L., Wang, Y.F., Yu, L., and Li, X.-R. (2009). “Experimental and computational studies on high-strength concrete circular columns confined by aramid fiber-reinforced polymer sheets.” J. Compos. Constr., 13(2), 125–134.
Yamamoto, T., Kawaguchi, J., and Morino, S. (2002). “Experimental study of the size effect on the behavior of concrete filled circular steel tube columns under axial compression.” J. Struct. Constr. Eng., AIJ, 561, 237–244 (in Japanese).
Yamamoto, T., Kawaguchi, J., Morino, S., and Koike, S. (2005). “Study on the size effect on compressive strength of concrete-filled square steel short tube.” J. Constr. Steel, 13, 509–514 (in Japanese).
Zhu, Z., Ahmad, I., and Mirmiran, A. (2005). “Effect of column parameters on axial compression behavior of concrete-filled FRP tubes.” Adv. Struct. Eng., 8(4), 443–449.
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Published In
Journal of Composites for Construction
Volume 15 • Issue 4 • August 2011
Pages: 535 - 544
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 12, 2010
Published online: Oct 1, 2010
Accepted: Oct 5, 2010
Published in print: Aug 1, 2011
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