Unified Strength Model for Square and Circular Concrete Columns Confined by External Jacket
Publication: Journal of Structural Engineering
Volume 135, Issue 3
Abstract
When the corner radius ratio is defined as (corner radius divided by half breadth of column), circular and sharp cornered square columns are just two special cases when and 0, respectively. It is quite logical that a confined concrete strength model for columns with a corner radius should degenerate into a model for circular and sharp cornered square columns when and 0, respectively. However, this is not the case in any of the existing models, except for the early one by Mirmiran et al. in 1998. Extensive experimental testing on fiber-reinforced polymer (FRP)-confined concrete columns that have a continuous variation of from 0 to 1 has been undertaken by the writers. Based on the experimental findings, a rational procedure is proposed for developing a unified strength model for FRP-confined concrete columns with an arbitrary corner radius. A comprehensive database has been established by collecting all of the available experimental results from the open literature for evaluation of the unified model. The proposed procedure is applicable to concrete columns confined not only by FRP materials but also other materials such as steel plates.
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Acknowledgments
The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CityU UNSPECIFIED1113/04E).
References
Al-Salloum, Y. A. (2007). “Influence of edge sharpness on the strength of square concrete columns confined with FRP composite laminates.” Composites, Part B, 38, 640–650.
American Concrete Institute (ACI) Committee 440. (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” Rep., Technical Committee Document 440.2R-02, Detroit.
Campione, G., and Miraglia, N. (2003). “Strength and strain capacities of concrete compression members reinforced with FRP.” Cem. Concr. Compos., 25, 31–41.
Comité Euro-International du Beton/Fedeŕation International Précontrainle (CEB-FIP). (2001). “Externally bonded FRP reinforcement for RC structures.” Bulletin 14, Paris.
Cole, C., and Belarbi, A. (2001). “Confinement characteristics of rectangular FRP jacketed RC columns.” Proc., 5th Int. Symp. on Fiber Reinforced Polymer for Reinforce Concrete Structures (FRPRCS-5), Cambridge, 823–832.
Fardis, M. N., and Khalili, H. (1982). “FRP-encased concrete as a structural material.” Mag. Concrete Res., 34(121), 191–202.
Ilki, A., Kumbasar, N., and Koc, V. (2004). “Low strength concrete members externally confined with FRP sheets.” Int. J. Struct. Eng. Mech., 18(2), 167–194.
Karabinis, A. I., and Rousakis, T. C. (2001). “Carbon FRP confined concrete elements under axial load.” Proc., Int. Conf. on FRP Composites in Civil Engineering, J. G. Teng ed., Hong Kong, 309–316.
Kono, S., Inazumi, M., and Kaku, T. (1998). “Evaluation of confining effects of CFRP sheets on reinforced concrete members.” Proc., 2nd ICCI, Tucson, Ariz., 343–355.
Kumutha, R., Vaidyanathan, R., and Palanichamy, M. S. (2007). “Behaviour of reinforced concrete rectangular columns strengthened using GFRP.” Cem. Concr. Compos., 29(8), 609–615.
Lam, L., and Teng, J. G. (2001). “A new stress-strain model for FRP-confined concrete.” Proc., Int. Conf. on FRP Composites in Civil Engineering, J. G. Teng, ed., Hong Kong, 283–292.
Lam, L., and Teng, J. G. (2003a). “Design-oriented stress-strain model for FRP-confined concrete.” Constr. Build. Mater., 17, 471–489.
Lam, L., and Teng, J. G. (2003b). “Design-oriented stress-strain model for FRP-confined concrete in rectangular columns.” J. Reinf. Plast. Compos., 22(13), 1149–1186.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 114(8), 1804–1826.
Marques, S. P. C., Marques, D. C. D. C., daSilva, J. L., and Cavalcante, M. A. A. (2004). “Model for analysis of concrete confined by fiber-reinforced polymer.” J. Compos. Constr., 8(4), 332–340.
Matthys, S., Toutanji, H., Audenaert, K., and Taerwe, L. (2005). “Axial load behavior of large-scale columns confined with FRP composites.” ACI Struct. J., 102(2), 258–267.
Mirmiran, A., and Shahawy, M. (1997). “Behavior of concrete columns confined by fiber composite.” J. Struct. Eng., 123(5), 583–590.
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.
Miyauchi, K., Inoue, S., Kuroda, T., and Kobayashi, A. (1999). “Strengthening effects with carbon fiber sheet for concrete column.” Proc., Jpn. Concr. Inst., 21(3), 1453–1458.
Miyauchi, K., Nishibayashi, S., and Inoue, S. (1997). “Estimation of strengthening effects with carbon fiber sheet for concrete column.” Proc., FRPRCS-3, Vol. 1, Sapporo, Japan, 217–224.
Moran, D. A., and Pantelides, C. P. (2002). “Stress-strain model for fiber-reinforced polymer-confined concrete.” J. Compos. Constr., 6(4), 233–240.
Razvi, S., and Saatcioglu, M. (1999). “Confinement model for high strength concrete.” J. Struct. Eng., 125(3), 281–289.
Restrepo, J. I., and De Vino, B. (1996). “Enhancement of the axial load-capacity of reinforced concrete columns by means of fiberglass-epoxy jackets.” Proc., 2nd Int. Conf. on Advanced Composite Materials in Bridges and Structures, Montreal, 547–553.
Richart, F. E., Brandtzaeg, A., and Brown, R. L. (1928). “A study of the failure of concrete under combined compressive stresses.” Engineering Experiment Bulletin No., 185, Univ. of Illinois, Urbana, Ill.
Rochette, P., and Labossière, P. (2000). “Axial testing of rectangular column models confined with composites.” J. Compos. Constr., 4(3), 129–136.
Saafi, M., Toutanji, H. A., and Li, Z. (1999). “Behavior of concrete columns confined with fiber reinforced polymer tubes.” ACI Struct. J., 96(4), 500–509.
Saenz, N., and Pantelides, C. P. (2007). “Strain-based confinement model for FRP-confined concrete.” J. Struct. Eng., 133(6), 825–833.
Samaan, M., Mirmiran, A., and Shahawy, M. (1998). “Model of concrete confined fiber composite.” J. Struct. Eng., 124(9), 1025–1031.
Shehata, L. A. E. M., Carneiro, L. A. V., and Shehata, L. C. D. (2002). “Strength of short concrete columns confined with CFRP sheets.” Mater. Struct., 35, 50–58.
Spoelstra, M. R., and Monti, G. (1999). “FRP-confined concrete model.” J. Compos. Constr., 3(3), 143–150.
Suter, R., and Pinzelli, R. (2001). “Confinement of concrete columns with FRP sheets.” Proc., 5th Int. Conf. on Fibre Reinforced Plastics for Reinforced Concrete Structures, Cambridge, U.K., 793–802.
Toutanji, H. A. (1999). “Stress-strain characteristics of concrete columns externally confined with advanced fiber composite sheets.” ACI Mater. J., 96(3), 397–404.
Wang, L. M., and Wu, Y. F. (2008). “Effect of corner radius on the performance of CFRP-confined square concrete columns: Test.” Eng. Struct., 30(2), 493–505.
Wu, Y. F., Tao, L., and Oehlers, D. J. (2006). “Fundamental principles that govern retrofitting of reinforced concrete columns by steel and FRP jacketing.” Adv. Struct. Eng., 9(4), 507–533.
Xiao, Y., and Wu, H. (2000). “Compressive behavior of concrete confined by carbon fiber composite jackets.” J. Mater. Civ. Eng., 12(2), 139–146.
Xiao, Y., and Wu, H. (2003). “Compressive behavior of concrete confined by various types of FRP composite jackets.” J. Reinf. Plast. Compos., 22(13), 1187–1201.
Yan, Z., and Pantelides, C. P. (2006). “Fiber-reinforced polymer jacketed and shape modified compression members. II—Model.” ACI Struct. J., 103(6), 894–903.
Yang, X. B., Wei, J., Nanni, A., and Dharani, L. R. (2004). “Shape effect on the performance of carbon fiber reinforced polymer wraps.” J. Compos. Constr., 8(5), 444–451.
Youssef, M. N., Feng, Q., and Mosallam, A. S. (2007). “Stress-strain model for concrete confined by FRP composites.” Composites, Part B, 38, 614–628.
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© 2009 ASCE.
History
Received: Jan 12, 2008
Accepted: Oct 6, 2008
Published online: Mar 1, 2009
Published in print: Mar 2009
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