Use of Mixed-Mode Fracture Interfaces for the Modeling of Large-Scale FRP-Strengthened Beams
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
In this study, numerical models of fiber-reinforced polymer (FRP)-strengthened beams were developed using nonlinear fracture mechanics for the modeling of the concrete-FRP (longitudinal and U-wrap) interfaces. Mode 1, Mode 2, and mixed-mode interfacial behaviors were considered. Results from the finite-element models were compared with experimental tests of large-scale strengthened beams using FRP U-wraps as anchors. The numerical program assessed the effect of the interfacial modeling in the global and local responses. A parametric study was conducted to determine the effect of additional longitudinal FRP sheets in strengthened beams with and without FRP U-wraps. Results from this study indicate that the use of a mixed-mode concrete-FRP interface is a robust numerical approach for the prediction of the global and local responses of large-scale FRP-strengthened beams. The parametric study shows that the use of FRP U-wraps could improve the strength and ductility of the FRP-strengthened beams by changing their failure mode and deflection response. Appropriate modeling of the concrete-FRP interfaces is needed to successfully predict these effects.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The research activities described in this paper have been supported by a CAREER Grant from the National Science Foundation (Grant No. NSFCMS-0330592).
References
American Concrete Institute (ACI). (2007). “Report on fiber-reinforced polymer (FRP) reinforcement for concrete structures.” ACI 440R-07, Farmington Hill, Mich.
American Concrete Institute (ACI). (2008). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 4402R-08, Farmington Hill, Mich.
Au, C., and Büyüköztürk, O. (2006). “Debonding of FRP plated concrete: A tri-layer fracture treatment.” Eng. Fract. Mech., 73(3), 348–365.
Baky, H. A., Ebead, U. A., and Neale, K. W. (2007). “Flexural and interfacial behavior of FRP-strengthened reinforced concrete beams.” J. Compos. Constr., 11(6), 629–639.
Boyajian, D. M., Davalos, J. F., and Ray, I. (2005). “Appraisal of the novel single contoured-cantilever beam.” Materials and Structures/Materiaux Et Constructions, 38(275), 11–16.
Brena, S. F., Bramblett, R. M., Wood, S. L., and Kreger, M. E. (2003). “Increasing flexural capacity of reinforced concrete beams using carbon fiber-reinforced polymer composites.” ACI Struct. J., 100(1), 36–46.
Büyüköztürk, O., and Hearing, B. (1998). “Failure behavior of precracked concrete beams retrofitted with FRP.” J. Compos. Constr., 2(3), 138–144.
Coronado, C. A. (2006). “Characterization, modeling and size effect of concrete-epoxy interfaces.” Ph.D. thesis, Pennsylvania State Univ., University Park, Pa.
Coronado, C. A., and Lopez, M. A. (2008). “Experimental characterization of concrete-epoxy interfaces.” J. Mater. Civ. Eng., 20(4), 303–312.
Coronado, C. A., and Lopez, M. A. (2010). “Numerical modeling of concrete-FRP debonding using a crack band.” J. Compos. Constr., 14(1), 11–21.
Coronado, C. A., and Lopez, M. M. (2007). “Damage approach for the prediction of debonding failure on concrete elements strengthened with FRP.” J. Compos. Constr., 11(4), 391–400.
Daniel, I. M., and Ishai, O. (2006). Engineering mechanics of composite materials, 2nd Ed., Oxford University Press, New York.
Fédération Internationale du Béton (FIB). (2001). “Externally bonded FRP reinforcement for RC structures.” fib Bulletin 14, Lausanne, Switzerland.
Hashin, Z., and Rotem, A. (1973). “Fatigue failure criterion for fiber reinforced materials.” J. Compos. Mater., 7(4), 448–464.
Hibbitt, Karlsson and Sorensen. (2007). ABAQUS/Explicit: User’s manual, Hibbitt Karlsson and Sorenson Inc., Pawtucket, R.I.
Higgins, C., Yim, S. C., Miller, T. H., Robelo, M. J., and Potisuk, T. (2004). “Remaining life of reinforced concrete beams with diagonal-tension cracks.” Final Rep. No. SPR 341, DOT, Ore.
Jiang, W. G., Hallett, S. R., Green, B. G., and Wisnom, M. R. (2007). “A concise interface constitutive law for analysis of delaminating and splitting in composite materials and its application to scaled notched tensile specimens.” Int. J. Numer. Methods Eng., 69(9), 1982–1995.
Jones, M. I., Wisnom, M. R., and Cui, W. (1994). “Effect of through thickness tensile and compressive stresses on delamination propagation fracture energy.” J. Compos. Technol. Res., 16(4), 329–335.
Lee, J. H., Lopez, M. M., and Bakis, C. E. (2009). “Slip effects in reinforced concrete beams with mechanically fastened FRP strip.” Cem. Concr. Compos., 31(7), 496–504.
Lu, X. Z., Teng, J. G., Ye, L. P., and Jiang, J. J. (2005). “Bond-slip models for FRP sheets/plates bonded to concrete.” Eng. Struct., 27(6), 920–937.
Lubliner, J., Oliver, J., Oller, S., and Onate, E. (1989). “Plastic-damage model for concrete.” Int. J. Solids Struct., 25(3), 299–326.
Pellegrino, C., Maiorana, E., and Modena, C. (2009). “FRP strengthening of steel and steel-concrete composite structures: An analytical approach.” Materials and Structures/Materiaux Et Constructions, 42(3), 353–363.
Qiao, P., and Xu, Y. (2004). “Evaluation of fracture energy of composite-concrete bonded interfaces using three-point bend tests.” J. Compos. Constr., 8(4), 352–359.
Todeschini, C. E., Bianchini, A. C., and Kesler, C. E. (1964). “Behavior of concrete columns reinforced with high strength steels.” ACI J., 61(6), 701–716.
Triantafillou, T. C., and Antonopoulos, C. P. (2000). “Design of concrete flexural members strengthened in shear with FRP.” J. Compos. Constr., 4(4), 198–205.
Wang, J. (2007). “Cohesive-bridging zone model of FRP-concrete interface debonding.” Eng. Fract. Mech., 74(17), 2643–2658.
Yuan, H., Teng, J. G., Seracino, R., Wu, Z. S., and Yao, J. (2004). “Full-range behavior of FRP-to-concrete bonded joints.” Eng. Struct., 26(5), 553–565.
Information & Authors
Information
Published In
Copyright
© 2010 ASCE.
History
Received: Sep 30, 2009
Accepted: May 21, 2010
Published online: Jun 8, 2010
Published in print: Dec 2010
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.