USE OF COHESIVE INTERFACE IN FE SIMULATIONS OF PRFC STRENGTHENED BEAMS
Abstract
This research had as objective evaluate the efforts acting on the adhesive interface
and the reinforced concrete beam strengthened in shear with carbon fiber composite (CFRP),
through numerical simulations. In addition, it is intended to predict the debonding of this
interface. For this, FE analysis were performed using ABAQUS software, based on
experimental tests by Obaidat, Heyden and Dahlblom (2010). In the strengthened interface,
cohesive elements were adopted to represent the chemical adhesive. The treatment of the data
was through load x displacement graphs and images that illustrate the program outputs, such
as tensions, damages and plastic deformations. The results showed good agreement with the
real ones, which provided pertinent conclusions to the analyzes. The damage to the cohesive
element was similar to that of the experimental debonding region, which proves the efficiency
of the adopted model. Their analyzes proved complex and required large studies on damage
mechanics and numerical models. These relied on the ease of varying various parameters,
which provides more refined and complex studies. It was possible to evaluate and predict the
regions of loss of adhesion, which may contribute to future work to develop techniques that
prevent premature debonding of shear strengthened beams.
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References
AMERICAN CONCRETE INSTITUTE - ACI 440.2R-08. Guide for the Design and
Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures.
Farmington Hills, MI, USA, 2008.
AMERICAN CONCRETE INSTITUTE - ACI 318-14. Building Code Requirements for
Structural Concrete. Farmington Hills, MI, USA, 2014.
BARBERO, E. J. Finite element analysis of composite materials using Abaqus (2013). 2 ed.
New York: CRC Press, 2013.
BENZEGGAGH, M.L.; KENANE, M. Measurement of Mixed-mode Delamination Fracture
Toughness of Unidirectional glass/epoxy Composites with Mixed-mode Bending Apparatus.
Composites Science and Technology, v. 56, p. 439-449, 1996.
CAMANHO, P. P.; DÁVILA, C. G. Mixed-Mode Decohesion Finite Elements for the
Simulation of Delamination in Composite Materials. Nasa/Tm-2002-211737, p. 42, 2002.
CHI, Y. et al. Finite element modeling of steel-polypropylene hybrid fiber reinforced concrete
using modified concrete damaged plasticity. Engineering Structures, v. 148, p. 23–35, 2017.
COELHO, A. M. G. Finite Element Guidelines for Simulation of Delamination Dominated
Failures in Composite Materials Validated by Case Studies. Archives of Computational
Methods in Engineering, v. 23, n. 2, p. 363–388, 2016.
COLALILLO, M. A.; SHEIKH, S. A. Behavior of shear-critical reinforced concrete beams
strengthened with fiber-reinforced polymer-Experimentation. ACI Structural Journal, v. 111,
n. 6, p. 1373–1384, 2014.
DEMIN, W.; FUKANG, H. Investigation for plastic damage constitutive models of the concrete
material. Procedia Engineering, v. 210, p. 71–78, 2017.
GUO, Z. Principles of reinforced concrete. Pequim: Butterworth-Heinemann, 2014.
KEZMANE, A.; BOUKAIS, S.; HAMIZI, M. Numerical simulation of squat reinforced
concrete wall strengthened by FRP composite material. Frontiers of Structural and Civil
Engineering, v. 10, n. 4, p. 445–455, 2016.
LEE, J.; FENVES, G. L. Plastic-damage model for cyclic loading of concrete structures.
Journal of Engineering Mechanics, v. 124, n. 8, p. 892–900, 1998.
LUBLINER, J.; OLIVER, J.; OLLER, S.; OÑATE, E. A plastic-damage model for concrete.
International Journal of Solids and Structures, v. 25, n. 3, p. 299–326, 1989.
OBAIDAT, Y. T.; HEYDEN, S.; DAHLBLOM, O. Nonlinear FE modelling of shear behaviour
in RC beam retrofitted with CFRP. Computational Modelling of Concrete Structures, v. 17,
n. 5, p. 671–677, 2010.
PIGGOT, M. Load Bearing Fibre Composites. 2 ed. Toronto: Kluwer Academic Publishers,
PANIGRAHI, A. K.; BISWAL, K. C.; BARIK, M. R. Strengthening of shear deficient RC Tbeams with externally bonded GFRP sheets. Construction and Building Materials, v. 57, p.
–91, 2014.
SAMWAYS, M. C. Análise numérica de juntas adesivadas pelo Método dos Elementos
Finitos considerando o início e a evolução do dano. Dissertação de Mestrado, Pontifícia
Universidade Católica do Paraná, Curitiba. p. 165, 2013.
SIMULIA ABAQUS. ABAQUS 6.14: Analysis User’s Guide. Vol. 1, 2, 3, 4 e 5. Dassault
Systèmes Simulia Corp, Providence, RI, USA, 2014.
YE, L. P.; LU, X. Z.; CHEN, J. F. Design proposals for the debonding strengths of FRP
strengthened RC beams in the Chinese design code. Proceedings of International Symposium
on Bond Behaviour of FRP in Structures, January, p. 45–54, 2005.
YU, F. et al. Experimental study on high pre-cracked RC beams shear-strengthened with CFRP
strips. Composite Structures, v. 225, May, p. 111163, 2019.
Os autores podem manter os direitos autorais pelo seu trabalho, mas repassam direitos de primeira publicação à revista. A revista poderá usar o trabalho para fins não-comerciais, incluindo direito de enviar o trabalho em bases de dados de Acesso Livre.
