Structural Engineering and Mechanics

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Modeling of RC shear walls strengthened by FRP composites

  • Sakr, Mohammed A. (Department of Structural Engineering, Tanta University) ;
  • El-khoriby, Saher R. (Department of Structural Engineering, Tanta University) ;
  • Khalifa, Tarek M. (Department of Structural Engineering, Tanta University) ;
  • Nagib, Mohammed T. (Department of Structural Engineering, Tanta University)
  • Received : 2016.07.18
  • Accepted : 2016.12.16
  • Published : 2017.02.10
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Abstract

RC shear walls are considered one of the main lateral resisting members in buildings. In recent years, FRP has been widely utilized in order to strengthen and retrofit concrete structures. A number of experimental studies used CFRP sheets as an external bracing system for retrofitting of RC shear walls. It has been found that the common mode of failure is the debonding of the CFRP-concrete adhesive material. In this study, behavior of RC shear wall was investigated with three different micro models. The analysis included 2D model using plane stress element, 3D model using shell element and 3D model using solid element. To allow for the debonding mode of failure, the adhesive layer was modeled using cohesive surface-to-surface interaction model at 3D analysis model and node-to-node interaction method using Cartesian elastic-plastic connector element at 2D analysis model. The FE model results are validated comparing the experimental results in the literature. It is shown that the proposed FE model can predict the modes of failure due to debonding of CFRP and behavior of CFRP strengthened RC shear wall reasonably well. Additionally, using 2D plane stress model, many parameters on the behavior of the cohesive surfaces are investigated such as fracture energy, interfacial shear stress, partial bonding, proposed CFRP anchor location and using different bracing of CFRP strips. Using two anchors near end of each diagonal CFRP strips delay the end debonding and increase the ductility for RC shear walls.

Keywords

References

  1. Abaqus, "Abaqus/CAE User's Manual", Dassault Systemes Simulia Corp., Providence, RI, USA.
  2. Aci-318 (1999), Building code requirements for structural concrete and commentary. American Concrete Institute, Detroit (MI),USA.
  3. Alsayed, S.H., Almusallam, T.H., Ibrahim, S.M., Al-Hazmi, N.M., Al-Salloum, Y.A. and Abbas, H. (2014), "Experimental and numerical investigation for compression response of CFRP strengthened shape modified wall-like RC column", Constr. Build. Mater., 63, 72-80. https://doi.org/10.1016/j.conbuildmat.2014.04.047
  4. Altin, S., Anil, O., Kopraman, Y. and Kara, M.E. (2013), "Hysteretic behavior of RC shear walls strengthened with CFRP strips", Compos. Part B: Eng., 44(1), 321-329. https://doi.org/10.1016/j.compositesb.2012.05.009
  5. Antoniades, K.K., Salonikios, T.N. and Kappos, A.J. (2007), "Evaluation of hysteretic response and strength of repaired R/C walls strengthened with FRPs", Eng. Struct., 29(9), 2158-2171. https://doi.org/10.1016/j.engstruct.2006.11.021
  6. Behfarnia, K. and Sayah, A.R. (2012), "FRP strengthening of shear walls with openings", Asian J. Civil Eng. (Build. Hous.), 13(5), 691-704.
  7. Benzeggagh, M.L. and Kenane, M. (1996), "Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixedmode bending apparatus", Compos. Sci. Technol., 56(4), 439-449. https://doi.org/10.1016/0266-3538(96)00005-X
  8. Brena, S.F. and Mcguirk, G.N. (2013), "Advances on the behavior characterization of FRP-anchored Carbon Fiber-Reinforced Polymer (CFRP) sheets used to strengthen concrete elements", Int. J. Concrete Struct. Mater., 7(1), 3-16. https://doi.org/10.1007/s40069-013-0028-1
  9. Christian, C., Kolluru, V.S., Marco, S. and Claudio, M. (2012), "Experimental determination of FRP-concrete cohesive interface properties under fatigue loading", Compos. Struct., 94, 1288-1296. https://doi.org/10.1016/j.compstruct.2011.10.026
  10. Cruz, C., Lau, D.T. and Sherwood, E. (2012), "Testing and anchor system performance of RC shear walls repaired and strengthened with externally-bonded FRP sheets", 15th World Conference of Earthquake Engineering, Lisbon, Portugal, September.
  11. Dan., D. (2012), "Experimental tests on seismically damaged composite steel concrete walls retrofitted with CFRP composites", Eng. Struct., 45, 338-348. https://doi.org/10.1016/j.engstruct.2012.06.037
  12. Deng, J. and Lee, M.M.K. (2007), "Behaviour under static loading of metallic beams reinforced with a bonded CFRP plate", Compos. Struct., 78(2), 232-242. https://doi.org/10.1016/j.compstruct.2005.09.004
  13. El-Sokkary, H. and Galal, K. (2013), "Seismic behavior of RC shear walls strengthened with fiber-reinforced polymer", J. Compos. Constr., 10, 603-613.
  14. Fernando, N.D. (2010), "Bond behaviour and debonding failures in CFRP-strengthened steel members", PhD Thesis, The Hong Kong Polytechnic University, Hong Kong, China.
  15. Guo, Z.G., Cao, S.Y., Sun, W.M. and Lin, X.Y. (2005), "Experimental study on bond stress-slip behaviour between FRP sheets and concrete", FRP in Construction, Proceedings of the International Symposium on Bond Behaviour of FRP in Structures, 77-84.
  16. Hu, H. and Schnobrich, W. (1989), "Constitutive modelling of concrete by using non associated plasticity", J. Mater. Civil Eng., ASCE, 1(4), 199-216. https://doi.org/10.1061/(ASCE)0899-1561(1989)1:4(199)
  17. Li, Z.J., Balendra, T., Tan, K.H., Li, Z.J. and Kong, K.H. (2005), "Finite element modeling of cyclic behavior of shear wall structure retrofitted using GFRP", Special Publication, 230, 1305-1324.
  18. Mohammed, B.S., Ean, L.W. and Malek, M.A. (2013), "One way RC wall panels with openings strengthened with CFRP", Constr. Build. Mater., 40, 575-583. https://doi.org/10.1016/j.conbuildmat.2012.11.080
  19. Mostofinejad, D. and Anaei, M.M. (2012), "Effect of confining of boundary elements of slender RC shear wall by FRP composites and stirrups", Eng. Struct., 41, 1-13. https://doi.org/10.1016/j.engstruct.2012.03.019
  20. Obaidat, Y.T., Heyden, S. and Dahlblom, O. (2010a), "The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM", Compos. Struct., 92(6), 1391- 1398. https://doi.org/10.1016/j.compstruct.2009.11.008
  21. Obaidat, Y.T., Heyden, S., Dahlblom, O., Farsakh, G.A. and Yahia, A.J. (2010b), "Retrofitting of reinforced concrete beams using composite laminates", Constr. Build. Mater., 25(2), 591-597. https://doi.org/10.1016/j.conbuildmat.2010.06.082
  22. Qazi, S., Michel, L. and Ferrier, E. (2013), "Mechanical behaviour of slender rc wall under seismic loading strengthened with external bonded cfrp", Eur. J. Environ. Civil Eng., 17(6), 496-506. https://doi.org/10.1080/19648189.2013.791076
  23. Qazi, S., Michel, L. and Ferrier, E. (2015), "Impact of CFRP partial bonding on the behaviour of short reinforced concrete wall under monotonic lateral loading", Compos. Struct., 128, 251-259. https://doi.org/10.1016/j.compstruct.2015.03.051
  24. Saenz, L.P. (1964), "Discussion of „„Equation for the stress-strain curve of concrete" by Desayi P, Krishnan S", ACI J., 61(6), 1229-1235.
  25. Sakr, M.A., Khalifa, T.M. and Mansour, W.N. (2014), "External strengthening of RC continuous beams using FRP plates: finite element model", Proceedings of the Second International Conference on Advances In Civil, Structural and Mechanical Engineering-CSM, Birmingham, England.
  26. Zhou, H., Attard, T.L., Zhao, B., Yu, J., Lu, W. and Tong, L. (2013), "Experimental study of retrofitted reinforced concrete shear wall and concrete-encased steel girders using a new CarbonFlex composite for damage stabilization", Eng. Fail. Anal., 35, 219-233. https://doi.org/10.1016/j.engfailanal.2013.01.032

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