Structural Engineering and Mechanics

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The effect of CFRP-concrete bond mechanism on dynamic parameters of repaired concrete girders

  • Fayyadh, Moatasem M. (Asset Lifecycle) ;
  • Razak, Hashim A. (Department of Civil Engineering, University of Malaya)
  • Received : 2021.03.10
  • Accepted : 2022.02.11
  • Published : 2022.05.10
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Abstract

An understanding of the mechanism of concrete girders repaired with CFRP plates and its influence on the dynamic parameters is presented in this paper. Dynamic parameters are governed by the relationship with the physical properties of concrete girders and CFRP plates as well as the adhesive layer between them. A brief explanation of the mechanism of the composite action of concrete girders repaired with CFRP is also given in this paper. Experimental work was carried out to validate the theory of the composite action. The results show a decrease in the modal parameters of CFRP repaired girders that were turned over during the repair procedure, which contrasts with the proven static-based results that CFRP plates increase the stiffness of repaired girders. The composite action theory has explained the results based on the tension and compression forces' growth at the adhesive layer between the CFRP plates and girder surface during the repair procedure. Other girders were prepared and repaired without turning over in order to avoid tension and compression forces at the adhesive layer. The experimental results show an increase in the dynamic parameters of CFRP repaired girders that were not turned over during the repair procedure, which aligns with the static-based results. The study concludes that the dynamic parameters are excellent indicators for the assessment of CFRP repaired concrete girders. The study also suggests that researchers should not turn over damaged concrete girders to repair them with CFRP plates if they intend to study the dynamic parameters, in order to avoid the proposed composite action effect on modal parameters.

Keywords

Acknowledgement

The authors would like to acknowledge the financial assistance provided by University of Malaya. The authors would also like to thank all the people who have contributed in any way to making this research possible.

References

  1. Abdul Razak, H. and Choi, F. (2001), "The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams", Eng. Struct., 23(9), 1126-1133. https://doi.org/10.1016/S0141-0296(01)00005-0.
  2. Abdul Razak, H. and Fayyadh, M.M. (2013), "Sensitivity of natural frequencies to composite effects in reinforced concrete elements", Mech. Adv. Mater. Struct., 20(6), 441-453. https://doi.org/10.1080/15376494.2011.627636.
  3. Abed, M.J., Fayyadh, M.M. and Khaleel, O.R. (2021), "Effect of web opening diameter on performance and failure mode of CFRP repaired RC beams", Mater. Today: Proc., 42(2), 388-398. https://doi.org/10.1016/j.matpr.2020.09.591.
  4. ACI 211.1 (1991), Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete, American Concrete Institute, Farmington Hills, MI, USA.
  5. ACI 318 (2008), Building Code Requirements for Structural Concrete and Commentary, American Concrete Institute, Farmington Hills, MI, USA.
  6. ACI 440.2R (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, Farmington Hills, MI, USA.
  7. Ahmed, A., Naganathan, S., Nasharuddin, K. and Fayyadh, M.M. (2016), "Repair effectiveness of damaged RC beams with web opening using CFRP and steel plates", Jordan J. Civil Eng., 10(2), 163-183. https://doi.org/10.14525/JJCE.10.1.3534
  8. Ahmed, A., Naganathan, S., Nasharuddin, K., Fayyadh, M.M. (2015), "Repair effectiveness of CFRP and steel plates in RC beams with web opening: Effect of plate thickness", Int. J. Civil Eng., 13(2), 234-244. https://doi.org/10.22068/IJCE.13.2.234.
  9. Al-Khafaji, A. and Salim, H. (2020), "Flexural strengthening of RC continuous T-Beams using CFRP", Fiber., 8(6), 41. https://doi.org/10.3390/fib8060041.
  10. AL-Kharkhi, H. and Aziz, A. (2018), "Shear strengthening of reinforced self-compacted concrete hammer head beams using warped CFRP strips: Experimental and theoretical study", Jordan J. Civil Eng., 12(4), 629-636.
  11. Benzaid, R., Chikh, N.E. and Mesbah, H. (2008), "Behaviour of square concrete column confined With GFRP composite warp", J. Civil Eng. Manage., 14(2), 115-120. https://doi.org/10.3846/1392-3730.2008.14.6.
  12. Catbas, F.N., Gul, M. and Burkett, J.L. (2008), "Conceptual damage-sensitive features for structural health monitoring: Laboratory and field demonstrations", Mech. Syst. Signal Pr., 22(7), 1650-1669. https://doi.org/10.1016/j.ymssp.2008.03.005.
  13. De Lautour, O.R. and Omenzetter, P. (2010), "Damage classification and estimation in experimental structures using time series analysis and pattern recognition", Mech. Syst. Signal Pr., 24(5), 1556-1569. https://doi.org/10.1016/j.ymssp.2009.12.008.
  14. Demeter, G. (1973), Free Vibration of Two-Degree Spring-Mass System, Wiley-Interscience, New York, NY, USA.
  15. Deraemaeker, A., Reynders, E., De Roeck, G. and Kullaa, J. (2008), "Vibration-based structural health monitoring using output-only measurements under changing environment", Mech. Syst. Signal Pr., 22(1), 34-56. https://doi.org/10.1016/j.ymssp.2007.07.004.
  16. Fang, C., Gylltoft, K., Lundgren, K. and Plos, M. (2006), "Effect of corrosion on bond in reinforced concrete under cyclic loading", J. Cement Concrete Res., 36(3), 548-555. https://doi.org/10.1016/j.cemconres.2005.11.019.
  17. Fayyadh, M.M. (2021), "Modified models to predict the ultimate flexural and shear capacities of CFRP repaired RC beams", Adv. Comput. Des., 7(1), 81-98. https://doi.org/10.12989/acd.2022.7.1.081.
  18. Fayyadh, M.M. and Abdul Razak, H. (2011), "Detection of damage location using mode shape deviation: Numerical study", Int. J. Phys. Sci., 6(24), 5688-5698. https://doi.org/10.5897/IJPS11.971.
  19. Fayyadh, M.M. and Abdul Razak, H. (2011), "Weighting method for modal parameter based damage detection algorithms", Int. J. Phys. Sci., 6(20), 4816-4825. https://doi.org/10.5897/IJPS11.929.
  20. Fayyadh, M.M. and Abdul Razak, H. (2012), "Assessment of adhesive setting time in reinforced concrete beams strengthened with carbon fibre reinforced polymer laminates", Mater. Des., 37, 64-72. https://doi.org/10.1016/j.matdes.2011.12.031.
  21. Fayyadh, M.M. and Abdul Razak, H. (2012), "Assessment of effectiveness of CFRP repaired RC beams under different damage levels based on flexural stiffness", Constr. Build. Mater., 37, 125-134. https://doi.org/10.1016/j.conbuildmat.2012.07.021.
  22. Fayyadh, M.M. and Abdul Razak, H. (2013), "Damage identification and assessment in RC structures using vibration data: A review", J. Civil Eng. Manage., 19(3), 375-386. https://doi.org/10.3846/13923730.2012.744773.
  23. Fayyadh, M.M. and Abdul Razak, H. (2014), "Analytical and experimental study on repair effectiveness of CFRP sheets for RC beams", J. Civil Eng. Manage., 20(1), 21-31. https://doi.org/10.3846/13923730.2013.799095.
  24. Fayyadh, M.M. and Abdul Razak, H. (2021), "Externally bonded FRP applications in RC structures: A state-of-the-art review", Jordan J. Civil Eng., 15(2), 157-179.
  25. Fayyadh, M.M., Abdul Razak, H. and Khaleel, O.R. (2011), "Differential effects of support conditions on dynamic parameters", Procedia Eng., 14, 177-184. https://doi.org/10.1016/j.proeng.2011.07.021.
  26. Frans, R., Arfiadi, Y. and Parung, H. (2017), "Comparative study of mode shapes curvature and damage locating vector methods for damage detection of structures", Procedia Eng., 171, 1263-1271. https://doi.org/10.1016/j.proeng.2017.01.420.
  27. Lindorf, A., Lemnitzer, L. and Curbach, M. (2009), "Experimental investigations on bond behavior of reinforced concrete under transvers tension and repeated loading", J. Eng. Struct., 31(7), 1469-1476. https://doi.org/10.1016/j.engstruct.2009.02.025.
  28. Mafia, S., Rinaldi, Z. and Sacco, E. (2004), "Softening Behavior of reinforced concrete beams under cyclic loading", Int. J. Solid. Struct., 41(11-12), 3293-3316. https://doi.org/10.1016/j.ijsolstr.2003.12.015.
  29. Nguyen, D.H., Bui-Tien, T., De Roeck, G. and Abdel Wahab, M. (2021), "Damage detection in structures using modal curvatures gapped smoothing method and deep learning", Struct. Eng. Mech., 77(1), 47-56. https://doi.org/10.12989/sem.2021.77.1.047.
  30. Ombres, L. (2010), "Prediction of intermediate crack debonding failure in FRP-strengthened reinforced concrete beams", Compos. Struct., 92(2), 322-329. https://doi.org/10.1016/j.compstruct.2009.08.003.
  31. Perera, R. and Bueso-Inchausti, D. (2010), "A unified approach for the static and dynamic analyses of intermediate debonding in FRP-strengthened reinforced concrete beams", Compos. Struct., 92(11), 2728-2737. https://doi.org/10.1016/j.compstruct.2010.04.006.
  32. Rodriguez, R., Escobar, J.A. and Gomez, R. (2010), "Damage detection in instrumented structures without baseline modal parameters", Eng. Struct., 32(6), 1715-1722. https://doi.org/10.1016/j.engstruct.2010.02.021.
  33. Shokrani, Y., Dertimanis, V.K., Chatzi, E.N. and Savoia, M.N. (2018), "On the use of mode shape curvature for damage localization under varying environmental conditions", Struct. Control Hlth. Monit., 25(4), e2132. https://doi.org/10.1002/stc.2132.
  34. Vukovic, N.K., Jevric, M. and Zejak, R. (2020), "Experimental analysis of RC elements strengthened with CFRP strip", Mech. Compos. Mater., 56, 75-84. https://doi.org/10.1007/s11029-020-09861-x.
  35. Wang, H. (2009), "An analytical study of bond strength associated with splitting of concrete cover", J. Eng. Struct., 31(4), 968-975. https://doi.org/10.1016/j.engstruct.2008.12.008.
  36. Wang, J. and Qiao, P. (2008), "On irregularity-based damage detection method for cracked beams", Int. J. Solid. Struct., 45(2), 688-704. https://doi.org/10.1016/j.ijsolstr.2007.08.017.
  37. Xie H.B. and Wang Y.F. (2019), "Reliability analysis of CFRP-strengthened RC bridges considering size effect of CFRP", Mater., 12(14), 2247. https://doi.org/10.3390/ma12142247.
  38. Yan, G., Duan, Z., Ou, J. and De Stefano, A. (2010), "Structural damage detection using residual forces based on wavelet transform", Mech. Syst. Signal Pr., 24(1), 224-239. https://doi.org/10.1016/j.ymssp.2009.05.013.