Stress–Strain Relation of FRP-Confined Predamaged Concrete Prisms with Square Sections of Different Corner Radii Subjected to Monotonic Axial Compression
Publication: Journal of Composites for Construction
Volume 23, Issue 2
Abstract
This paper presents the results of an experimental study on the behavior of predamaged concrete prisms that were strengthened with fiber-reinforced polymer (FRP) jackets. Tests were conducted on 46 concrete columns involving variations of corner radius ratios, damage levels, and confinement pressure. This paper investigates the effect of corner radii on the main parameters of the stress–strain curve for FRP-strengthened predamaged specimens, such as compressive strength, strain capacity, and initial elastic modulus. The test results demonstrated that the efficiency of repairing damaged columns greatly depends on the corner radius ratio. The strength gains after FRP strengthening decrease as the corner radius ratio reduces. Furthermore, this paper extends a well-established stress–strain model originally proposed for FRP-confined predamaged circular concrete columns to square columns. More accurate expressions for the strength, deformation capacity, and stress–strain relationship were developed considering both the corner radius ratio and predamaged level. The proposed model was verified by test results and can predict the stress–strain behavior of a FRP-confined predamaged concrete column with good accuracy.
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Acknowledgments
The work described in this paper was financially supported by the National Natural Science Foundation of China (Grant Nos. 51622808, 51578337, 51578338, and 51778371) and the Shenzhen Basic Research Project (Grant No. JCYJ20170817100253542), for which the authors are grateful.
References
ACI (American Concrete Institute). 2002. Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. Farmington Hills, MI: ACI.
ASTM. 1995. Standard test method for tensile properties of polymer matrix composite materials. ASTM D3039. West Conshohocken, PA: ASTM.
Bai, Y. L., J. G. Dai, and J. G. Teng. 2017. “Monotonic stress–strain behavior of steel rebars embedded in FRP-confined concrete including buckling.” J. Compos Constr. 21 (5): 04017043. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000823.
Cao, Y. G., C. Jiang, and Y. F. Wu. 2016. “Cross-sectional unification on the stress–strain model of concrete subjected to high passive confinement by fiber-reinforced polymer.” Polymers 8 (5): 186. https://doi.org/10.3390/polym8050186.
Chen, L., and T. Ozbakkaloglu. 2016. “Corner strengthening of square and rectangular concrete-filled FRP tubes.” Eng. Struct. 117: 486–495. https://doi.org/10.1016/j.engstruct.2016.03.031.
Csuka, B., and L. P. Kollár. 2012a. “Analysis of FRP confined columns under eccentric loading.” Compos. Struct. 94 (3): 1106–1116. https://doi.org/10.1016/j.compstruct.2011.10.012.
Csuka, B., and L. P. Kollár. 2012b. “Fiber-reinforced plastic-confined rectangular columns subjected to axial loading.” J. Reinf. Plast. Comp. 31 (7): 481–493. https://doi.org/10.1177/0731684412439942.
Dai, J. G., Y. L. Bai, and J. G. Teng. 2011. “Behavior and modeling of concrete confined with FRP composites of large deformability.” J. Compos. Constr. 15 (6): 963–973. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000230.
Fardis, M. N., and H. H. Khalili. 1982. “FRP-encased concrete as a structural material.” Mag. Concrete Res. 34 (121): 191–202. https://doi.org/10.1680/macr.1982.34.121.191.
Ferrotto, M. F., O. Fischer, and L. Cavaleri. 2018. “Analysis-oriented stress–strain model of CRFP-confined circular concrete columns with applied preload.” Mater. Struct. 51 (2): 44. https://doi.org/10.1617/s11527-018-1169-0.
Iacobucci, R. D., S. A. Sheikh, and O. Bayrak. 2003. “Retrofit of square concrete columns with carbon fiber-reinforced polymer for seismic resistance.” ACI Struct. J. 100 (6): 785–794.
Ilki, A., O. Peker, E. Karamuk, C. Demir, and N. Kumbasar. 2008. “FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns.” J. Mater. Civ. Eng. 20 (2): 169–188. https://doi.org/10.1061/(ASCE)0899-1561(2008)20:2(169).
Jiang, C., Y. F. Wu, and J. F. Jiang. 2017a. “Effect of aggregate size on stress–strain behavior of concrete confined by fiber composites.” Compos. Struct. 168: 851–862. https://doi.org/10.1016/j.compstruct.2017.02.087.
Jiang, J. F., and Y. F. Wu. 2012. “Identification of material parameters for Drucker-Prager plasticity model for FRP confined circular concrete columns.” Int. J. Solids Struct. 49 (3): 445–456. https://doi.org/10.1016/j.ijsolstr.2011.10.002.
Jiang, J. F., and Y. F. Wu. 2015. “Plasticity-based criterion for confinement design of FRP jacketed concrete columns.” Mater. Struct. 49 (6): 2035–2051. https://doi.org/10.1617/s11527-015-0632-4.
Jiang, J. F., P. C. Xiao, and B. B. Li. 2017c. “Ture-triaxial compressive behavior of concrete under passive confinement.” Constr. Build. Mater. 156: 584–598. https://doi.org/10.1016/j.conbuildmat.2017.08.143.
Jiang, T., and J. G. Teng. 2007. “Analysis-oriented stress–strain models for FRP-confined concrete.” Eng. Struct. 29 (11): 2968–2986. https://doi.org/10.1016/j.engstruct.2007.01.010.
Lam, L., and J. G. Teng. 2003. “Design-oriented stress–strain model for FRP-confined concrete in rectangular columns.” J. Reinf. Plast. Comp. 22 (13): 1149–1186. https://doi.org/10.1177/0731684403035429.
Li, G., S. Hedlund, S. S. Pang, W. Alaywan, J. Eggers, and C. Abadie. 2003. “Repair of damaged RC columns using fast curing FRP composites.” Compos. Part B Eng. 34 (3): 261–271. https://doi.org/10.1016/S1359-8368(02)00101-4.
Li, P., and Y. F. Wu. 2015. “Stress–strain model of FRP confined concrete under cyclic loading.” Compos. Struct. 134: 60–71. https://doi.org/10.1016/j.compstruct.2015.08.056.
Li, P., and Y. F. Wu. 2016. “Stress–strain behavior of actively and passively confined concrete under cyclic axial load.” Compos. Struct. 149: 369–384. https://doi.org/10.1016/j.compstruct.2016.04.033.
Li, P., Y. F. Wu, and R. Gravina. 2016. “Cyclic response of FRP-confined concrete with post-peak strain softening behavior.” Constr. Build. Mater. 123: 814–828. https://doi.org/10.1016/j.conbuildmat.2016.07.065.
Li, P., Y. F. Wu, Y. Zhou, and F. Xing. 2018. “Cyclic stress–strain model for FRP-confined concrete considering post-peak softening.” Compos. Struct. 201: 902–915. https://doi.org/10.1016/j.compstruct.2018.06.088.
Lim, J. C., and T. Ozbakkaloglu. 2014a. “Confinement model for FRP-confined high-strength concrete.” J. Compos. Constr.18 (4): 04013058. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000376.
Lim, J. C., and T. Ozbakkaloglu. 2014b. “Design model for FRP-confined normal- and high-strength concrete square and rectangular columns.” Mag. Concrete Res. 66 (20): 1020–1035. https://doi.org/10.1680/macr.14.00059.
Memon, M. S., and S. A. Sheikh. 2005. “Seismic resistance of square concrete columns retrofitted with glass fiber-reinforced polymer.” ACI Struct. J. 102 (5): 774–783.
Mirmiran, A., M. Shahawy, M. Samaan, H. E. Echary, J. C. Mastrapa, and O. Pico. 1998. “Effect of column parameters on FRP-confined concrete.” J. Compos. Constr. 2 (4): 175–185. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:4(175).
Ozbakkaloglu, T. 2013a. “Axial compressive behavior of square and rectangular high-strength concrete-filled FRP tubes.” J. Compos. Constr. 17 (1): 151–161. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000321.
Ozbakkaloglu, T. 2013b. “Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression.” Compos. Part B Eng. 54: 97–111. https://doi.org/10.1016/j.compositesb.2013.05.007.
Ozbakkaloglu, T., and T. Vincent. 2014. “Axial compressive behavior of circular high-strength concrete-filled FRP tubes.” J. Compos. Constr. 18 (2): 04013037. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000410.
Pessiki, S., K. A. Harries, J. T. Kestner, R. Sause, and J. M. Ricles. 2001. “Axial behavior of reinforced concrete columns confined with FRP jackets.” J. Compos. Constr. 5 (4): 237–245. https://doi.org/10.1061/(ASCE)1090-0268(2001)5:4(237).
Pham, T. M., and M. N. Hadi. 2014. “Stress prediction model for FRP confined rectangular concrete columns with rounded corners.” J. Compos. Constr. 18 (1): 04013019. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000407.
Richart, F. E., A. Brandtzaeg, and R. L. Brown. 1928. A study of the failure of concrete under combined compressive stresses: University of Illinois Bulletin; v. 26, no. 12. Urbana, IL: Univ. of Illinois.
Richart, F. E., A. Brandtzæg, and R. L. Brown. 1929. Failure of plain and spirally reinforced concrete in compression: University of Illinois. Engineering Experiment Station. Bulletin; no. 190. Urbana, IL: Univ. of Illinois.
Rochette, P., and P. Labossiere. 2000. “Axial testing of rectangular column models confined with composites.” J. Compos. Constr. 4 (3): 129–136. https://doi.org/10.1061/(ASCE)1090-0268(2000)4:3(129).
Saadatmanesh, H., M. R. Ehsani, and L. Jin. 1997. “Repair of earthquake-damaged RC columns with FRP wraps.” ACI Struct. J. 94 (2): 206–215.
Saiidi, M. S., and Z. Cheng. 2004. “Effectiveness of composites in earthquake damage repair of reinforced concrete flared columns.” J. Compos. Constr. 8 (4): 306–314. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:4(306).
Sheikh, S. A., and G. Yau. 2002. “Seismic behavior of concrete columns confined with steel and fiber-reinforced polymers.” ACI Struct. J. 99 (1): 72–80.
Smith, S. T., S. J. Kim, and H. Zhang. 2010. “Behavior and effectiveness of FRP wrap in the confinement of large concrete cylinders.” J. Compos. Constr. 14 (5): 573–582. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000119.
Stoppenhagen, D. R., J. O. Jirsa, and L. A. Wyllie. 1995. “Seismic repair and strengthening of a severely damaged concrete frame.” ACI Struct. J. 92 (2): 177–187.
Teng, J. G., T. Jiang, L. Lam, and Y. Z. Luo. 2009. “Refinement of a design-oriented stress–strain model for FRP-confined concrete.” J. Compos. Constr. 13 (4): 269–278. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000012.
Van Den Einde, L., L. Zhao, and F. Seible. 2003. “Use of FRP composites in civil structural applications.” Constr. Build. Mater. 17 (6): 389–403. https://doi.org/10.1016/S0950-0618(03)00040-0.
Wang, L. M., and Y. F. Wu. 2008. “Effect of corner radius on the performance of CFRP-confined square concrete columns: Test.” Eng. Struct. 30 (2): 493–505. https://doi.org/10.1016/j.engstruct.2007.04.016.
Wei, Y. Y., and Y. F. Wu. 2012. “Unified stress–strain model of concrete for FRP-confined columns.” Constr. Build. Mater. 26 (1): 381–392. https://doi.org/10.1016/j.conbuildmat.2011.06.037.
Wu, Y. F., and C. Jiang. 2013. “Effect of load eccentricity on the stress–strain relationship of FRP-confined concrete columns.” Compos. Struct. 98: 228–241. https://doi.org/10.1016/j.compstruct.2012.11.023.
Wu, Y. F., T. Liu, and D. J. Oehlers. 2006. “Fundamental principles that govern retrofitting of reinforced concrete columns by steel and FRP jacketing.” Adv. Struct. Eng. 9 (4): 507–533. https://doi.org/10.1260/136943306778812769.
Wu, Y. F., and Y. Y. Wei. 2010. “Effect of cross-sectional aspect ratio on the strength of CFRP-confined rectangular concrete columns.” Eng. Struct. 32 (1): 32–45. https://doi.org/10.1016/j.engstruct.2009.08.012.
Wu, Y. F., Y. Yun, Y. Wei, and Y. Zhou. 2014. “Effect of predamage on the stress–strain relationship of confined concrete under monotonic loading.” J. Struct. Eng. 140 (12): 04014093. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001015.
Yang, X., J. Wei, A. Nanni, and L. R. Dharani. 2004. “Shape effect on the performance of carbon fiber reinforced polymer wraps.” J. Compos. Constr. 8 (5): 444–451. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:5(444).
Yu, T., B. Zhang, and J. Teng. 2015. “Unified cyclic stress–strain model for normal and high strength concrete confined with FRP.” Eng. Struct. 102: 189–201. https://doi.org/10.1016/j.engstruct.2015.08.014.
Zhou, A., C. L. Chow, and D. Lau. 2017. “Structural behavior of GFRP reinforced concrete columns under the influence of chloride at casting and service stages.” Compos. Part B Eng. 136: 1–9. https://doi.org/10.1016/j.compositesb.2017.10.011.
Zhou, Y., J. Hu, M. Li, L. Sui, and F. Xing. 2016a. “FRP-confined recycled coarse aggregate concrete: Experimental investigation and model comparison.” Polymers 8 (10): 375. https://doi.org/10.3390/polym8100375.
Zhou, Y., M. Li, L. Sui, and F. Xing. 2016b. “Effect of sulfate attack on the stress–strain relationship of FRP-confined concrete.” Constr. Build. Mater. 110: 235–250. https://doi.org/10.1016/j.conbuildmat.2015.12.038.
Zhou, Y., X. Liu, F. Xing, H. Cui, and L. Sui. 2016c. “Axial compressive behavior of FRP-confined lightweight aggregate concrete: An experimental study and stress–strain relation model.” Constr. Build. Mater. 119: 1–15. https://doi.org/10.1016/j.conbuildmat.2016.02.180.
Zhou, Y., and Y. F. Wu. 2012. “General model for constitutive relationships of concrete and its composite structures.” Compos. Struct. 94 (2): 580–592. https://doi.org/10.1016/j.compstruct.2011.08.022.
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Published In
Journal of Composites for Construction
Volume 23 • Issue 2 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 2, 2018
Accepted: Aug 22, 2018
Published online: Jan 3, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 3, 2019
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