Modified Plastic-Damage Model for Fiber Reinforced Polymer-Confined Repaired Concrete Columns
Concrete Damaged Plasticity Model (CDPM) is capable of modeling the stress-strain behavior of confined concrete. Nevertheless, the accuracy of the model largely depends on its parameters. To date, most research works mainly focus on the identification and modification of the parameters for fiber reinforced polymer (FRP) confined concrete prior to damage. And, it has been established that the FRP-strengthened concrete behaves differently to FRP-repaired concrete. This paper presents a modified plastic damage model within the context of the CDPM in ABAQUS for modelling of a uniformly FRP-confined repaired concrete under monotonic loading. The proposed model includes infliction damage, elastic stiffness, yield criterion and strain hardening rule. The distinct feature of damaged concrete is elastic stiffness reduction; this is included in the model. Meanwhile, the test results were obtained from a physical testing of repaired concrete. The dilation model is expressed as a function of the lateral stiffness of the FRP-jacket. The finite element predictions are shown to be in close agreement with the obtained test results of the repaired concrete. It was observed from the study that with necessary modifications, finite element method is capable of modeling FRP-repaired concrete structures.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3462055Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 405
 Jiang, J. F. and Y. F. Wu, “Identification of material parameters for Drucker–Prager plasticity model for FRP confined circular concrete columns,” Int. J. Solids Struct., vol. 49, no. 3–4, pp. 445–456, Feb. 2012.
 Pekau, A. O., Z. X. Zhang, and G. T. Liu, “Constitutive model for concrete in strain space,” J. Eng. Mech., vol. 118, pp. 1907–1927, 1992.
 Tijani, I. A., Y. F. Wu, and C. W. Lim, “Aggregate size effects and general static loading response on mechanical behavior of passively confined concrete,” Constr. Build. Mater., vol. 205, pp. 61–72, 2019.
 Tsonos, A. G., “Effectiveness of CFRP-jackets and RC-jackets in post-earthquake and pre-earthquake retrofitting of beam–column subassemblages,” Eng. Struct., vol. 30, no. 3, pp. 777–793, Mar. 2008.
 Wu, Y.-F., Y. Yun, Y. Wei, and Y. Zhou, “Effect of predamage on the stress-strain relationship of confined concrete under monotonic loading,” J. Struct. Eng., vol. 140, no. 12, p. 04014093, Dec. 2014.
 Li, P., L. Sui, F. Xing, M. Li, Y. Zhou, and Y.-F. Wu, “Stress–strain relation of FRP-confined predamaged concrete prisms with square sections of different corner radii subjected to monotonic axial compression,” J. Compos. Constr., vol. 23, no. 2, p. 04019001, 2019.
 Mohammadi, M. and Y.-F. Wu, “Modified plastic-damage model for passively confined concrete based on triaxial tests,” Compos. Part B Eng., vol. 159, pp. 211–223, Feb. 2019.
 Yu, T., J. G. Teng, Y. L. Wong, and S. L. Dong, “Finite element modeling of confined concrete-I: Drucker–Prager type plasticity model,” Eng. Struct., vol. 32, no. 3, pp. 665–679, Mar. 2010.
 Yu, T., J. G. Teng, Y. L. Wong, and S. L. Dong, “Finite element modeling of confined concrete-II: Plastic-damage model,” Eng. Struct., vol. 32, no. 3, pp. 680–691, Mar. 2010.
 Kabir, M. Z. and E. Shafei, “Plasticity modeling of FRP-confined circular reinforced concrete columns subjected to eccentric axial loading,” Compos. Part B Eng., vol. 43, no. 8, pp. 3497–3506, 2012.
 Shahawy, M., A. Mirmiran, and T. Beitelman, “Tests and modeling of carbon-wrapped concrete columns,” Compos. Part B Eng., vol. 31, no. 6–7, pp. 471–480, Oct. 2000.
 Karabinis, A. I. and P. D. Kiousis, “Effects of confinement on concrete columns: Plasticity approach,” J. Struct. Eng., vol. 120, no. 9, pp. 2747–2767, Sep. 1994.
 Jiang, J., Y. Wu, and X. Zhao, “Application of Drucker-Prager plasticity model for stress-strain modeling of FRP confined concrete columns,” Procedia Eng., vol. 14, pp. 687–694, 2011.
 Youssef, M. N., M. Q. Feng, and A. S. Mosallam, “Stress–strain model for concrete confined by FRP composites,” Compos. Part B Eng., vol. 38, no. 5–6, pp. 614–628, 2007.
 Zhou, Y. W. and Y. F. Wu, “General model for constitutive relationships of concrete and its composite structures,” Compos. Struct., vol. 94, no. 2, pp. 580–592, 2012.
 Hoshikuma, J., K. Kawashima, K. Nagaya, and A. W. Taylor, “Stress-strain model for confined reinforced concrete in bridge piers,” J. Struct. Eng., vol. 123, no. 5, pp. 624–633, 1997.
 Ozbakkaloglu, T., A. Gholampour, and J. C. Lim, “Damage-plasticity model for FRP-confined normal-strength and high-strength concrete,” J. Compos. Constr., vol. 20, no. 6, p. 04016053, 2016.
 Richart, F. E., A. Brandtzaeg, and R. L. Brown, “The failure of plain and spirally reinforced concrete in compression,” Bull. 190, Univ. Illinois, Eng. Exp. Station. Champaign, 1929.
 Richart, F. E., A. Brandtzaeg, and R. L. Brown, “A study of the failure of concrete under combined compressive stresses,” Bull. 185, Univ. Illinois, Eng. Exp. Station. Champaign, IL., 1928.
 Hany, N. F., E. G. Hantouche, and M. H. Harajli, “Finite element modeling of FRP-confined concrete using modified concrete damaged plasticity,” Eng. Struct., vol. 125, pp. 1–14, Oct. 2016.