Advances in concrete construction

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Reliability study of CFRP externally bonded concrete beams designed by FIB bulletin 14 considering corrosion effects

  • Dehghani, Hamzeh (Department of Civil Engineering, Higher education complex of Bam)
  • Received : 2019.11.12
  • Accepted : 2022.02.23
  • Published : 2022.02.25
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Abstract

FIB is introduced as the sole guideline for the design purpose that results in a practical relationship for the torsional capacity of concrete beams strengthened with carbon fiber-reinforced polymer (CFRP). This study applies first-order reliability method to assess the reliability evaluation of the torsional capacity of CFRP-strengthened beams on the basis of FIB guidelines. In terms of steel reinforcement losses, this study applies a corrosion model to investigate the ceaseless deterioration of the existing structure. Hence, the average of reliability indices varies between 2.68 and 2.80, indicating the reliability viewpoint of the design methodologies. The average values are somehow low compared to the target values of reliability (3.0 or 3.5) applied in the calibration stage of the FIB guideline. In this way, the partial safety factors may change in the forthcoming guideline revisions. For this aim, the reliability of strengthening ratio was applied to assess the variation in the average value of the reliability index with different partial safety factors. The performance of parametric study for the factor proved that minimum values of 1.60 and 2.32 are required for target values of reliability (3.0 and 3.5), respectively.

Keywords

References

  1. Abdul Halim, N.H.F., Alih S.C., and Vafaei, M. (2021) "Seismic behavior of RC columns internally confined by CFRP strips", Adv. Concrete Constr., 12(3), 217-225. https://doi.org/10.12989/acc.2021.12.3.217.
  2. Alsayed, S.H. and Siddiqui, N.A. (2013), "Reliability of sheardeficient RC beams strengthened with CFRP -strips", Constr. Build. Mater., 42, 238-247. https://doi.org/10.1016/j.conbuildmat.2013.01.024.
  3. Ameli, M., Ronagh, H.R. and Dux, P.F. (2007), "Behavior of FRP strengthened reinforced concrete beams under torsion", ASCE J. Compos. Constr., 11(2), 192-200. https://doi.org/10.1061/(ASCE)1090-0268(2007)11:2(192)
  4. American Concrete Institute (ACI) (2008), Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-08), Farmington Hills, MI, USA.
  5. Atadero, R.A. and Karbhari, V.M. (2008), "Calibration of resistance factors for reliability based design of externally-bonded FRP composites", Compos. Part B, 39(4), 665-679. https://doi.org/10.1016/j.compositesb.2007.06.004.
  6. Ayyub, B.M. and McCuen, R.H. (2005), Probability, Statistics, and Reliability for Engineers, Boca Raton Fla, CRC Press.
  7. Biandini, F., Bantempi, F., Frangopol, D. and Malerba, P. (2004), "Reliability of material and geometrically non-linear reinforced and prestressed concrete structure", Comput. Struct., 82, 1021-1031. https://doi.org/10.1016/j.compstruc.2004.03.010.
  8. Chalioris, C.E. (2008), "Torsional strengthening of rectangular and flanged beams using carbon fibre-reinforced-polymers-experimental study", Constr. Build. Mater., 22(1), 21-29. https://doi.org/10.1016/j.conbuildmat.2006.09.003.
  9. Choi, S.K. Grandhi, R.V. and Canfield, R.A. (2006), ReliabilityBased Structural Design, Springer.
  10. Comite Europeen de Normalisation (1991), Eurocode 2 Design of concrete structures, Part 1-1 General rules and rules for buildings, Brussels, Belgium.
  11. Dehghani, H. and Fadaee, M. (2013), "Calibration of resistance factors for torsional reinforced concrete beams strengthened with FRP composites", Asian J. Civil Eng., 14(4), 503-516.
  12. Dehghani, H. and Fadaee, M. (2013), "Reliabilty-based torsional design of reinforced concrete beams strengthened with CFRP laminate", IJE Transac. Basic., 26(10), 1103-1110.
  13. Dehghani, H. and Fadaee, M.J. (2014), "Probabilistic assessment of torsion in concrete beams externally strengthened with CFRP composites", Mater. Struct., 47(5), 885-894. https://doi.org/10.1617/s11527-013-0100-y.
  14. Djeddi, L., and Amirat, A. (2020), "Corrosion initiation time models in RC coastal structures based on reliability approach", Adv. Concrete Constr., 9(2), 149-159. https://doi.org/10.12989/acc.2020.9.2.149.
  15. El-Tawil, S. and Okeil, A.M. (2002), "LRFD flexural provisions for prestressed concrete bridge girders strengthened with carbon fiber-reinforced polymer laminates", ACI Struct. J., 9(2), 181-190.
  16. Ellingwood, B., Galambos, T.V., MacGregor, J.G. and Cornell, C.A. (1980), Development of a Probability Based Load Criterion for American National Standard A58 Building Code Requirements for Minimum Design Loads in Buildings and Other Structures, 577, US Department of Commerce, National Bureau of Standards, Washington, DC, USA.
  17. Ellingwood, B.R. (2003), "Toward load and resistance factor design for fiber-reinforced polymer composite structures", J. Struct. Eng., 129(4), 449-458. https://doi.org/10.1061/(asce)0733-9445(2003)129:4(449)
  18. Federation Internationale du Beton (FIB) (2001), Externally bonded FRP reinforcement for reinforced concrete structures, Task Group 9.3 FRP.
  19. FERUM. http://www.ce.berkeley.edu/projects/ferum.
  20. Ghobarah, A., Ghorbel, M. and Chidiac, S. (2002), "Upgrading torsional resistance of reinforced concrete beams using fiber-reinforced polymer", J. Compos. Constr., 6(4), 257-263. https://doi.org/10.1061/(ASCE)1090-0268(2002)6:4(257)
  21. He, Z., Shang, M.H. and Li, X.M. (2009), "Reliability-based shear design for reinforced concrete beams with U-wrap FRP strengthening", Key Eng. Mater., 400, 525-530. https://doi.org/10.4028/www.scientific.net/KEM.400-402.525.
  22. Hii, A.K. and Al-Mahaidi, R. (2004), "Torsional strengthening of reinforced concrete beams using CFRP composites", FRP Compos. Civil Eng., Adelaide, Australia, Taylor and Francis, London, UK.
  23. Intelligent Sensing for Innovative Structures (ISIS) (2001), Design Manual Strengthening Reinforced Concrete Structures With Externally-Bonded Fiber-Reinforced Polymers, Winnipeg, Manitoba, Canada.
  24. Jing, M., and Grunberg, J. (2006), "Mechanical analysis of reinforced concrete box beam strengthened with carbon fiber sheets under combined actions", Comput. Struct., 73, 488-494. https://doi.org/10.1016/j.compstruct.2005.02.020.
  25. Kurtoglu, A.E., Cevik, A., Albegmprli, H.M., Gulsan, M.E. and Bilgehan, M. (2016), "Reliability-based modeling of punching shear capacity of FRP-reinforced two-way slabs", Comput. Concrete, 17(1), 78-106. https://doi.org/10.12989/cac.2016.17.1.087.
  26. Nowak, A.S. and Collins, K.R. (2000), Reliability of structures, McGraw-Hill.
  27. Okeil, A.M., El-Tawil, S. and Shahawy, M. (2002), "Flexural reliability of reinforced concrete bridge girders strengthened with carbon fiber-reinforced polymer laminates", ASCE J. Bridge. Eng., 7(5), 290-299. https://doi.org/10.1061/(ASCE)1084-0702(2002)7:5(290)
  28. Pham, H.B. and Al-Mahaidi, R. (2008), "Reliability analysis of bridge beams retrofitted with fiber reinforced polymers", Compos. Struct., 82(2), 177-184. https://doi.org/10.1016/j.compstruct.2006.12.010.
  29. Plevris, N., Triantafillou, T. and Veneziano, D. (1995), "Reliability of RC members strengthened with CFRP laminates", ASCE J. Struct. Eng., 121(7), 1037-1044. https://doi.org/10.1061/(ASCE)0733-9445(1995)121:7(1037)
  30. Salom, P.R., Gergely, J. and Young, D.T. (2004), "Torsional strengthening of spandrel beams with FRP-reinforced polymer laminates", ASCE J. Compos. Constr., 8(2), 157-162. https://doi.org/10.1061/(ASCE)1090-0268(2004)8:2(157)
  31. Shen, K., Wan, S., Mo, Y.L. and Jiang, Z. (2018), "Theoretical analysis on full torsional behavior of RC beams strengthened with FRP materials", Comput. Struct., 183(1), 347-357. https://doi.org/10.1016/j.compstruct.2017.03.084.
  32. Siddiqui, N.A., Khan, F.H. and Umar, A. (2009), "Reliability of underground concrete barriers against normal missile impact", Comput. Concrete, 6(1), 79-93. https://doi.org/10.12989/cac.2009.6.1.079.
  33. Szerszen, M.M. and Nowak, A.S. (2003), "Calibration of design code for buildings (ACI 318): part II-reliability analysis and resistance factors", ACI Struct. J., 100(3), 383-391.
  34. Taljsten, B. (2003), "Strengthening concrete beams for shear with CFRP sheets", Constr. Build. Mater., 17(1), 15-26. https://doi.org/10.1016/S0950-0618(02)00088-0.
  35. Umar Khan, M., Ahmad, S., Al-Gahtani, H.J. (2017), "Chloride-induced corrosion of steel in concrete: An overview on chloride diffusion and prediction of corrosion initiation time", Int. J. Corros., 2017. https://doi.org/10.1155/2017/5819202.
  36. Val, D.M. (2003), "Reliability of fiber-reinforced polymer-confined reinforced concrete columns", ASCE J. Struct. Eng., 129(8), 1122-1130. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:8(1122)
  37. Vu, K.A.T. and Stewart, M.G. (2000), "Structural reliability of concrete bridges including improved chloride-induced corrosion rates", Struct. Safety., 22, 313-333. https://doi.org/10.1016/S0167-4730(00)00018-7.
  38. Wang, N., Ellingwood, B.R. and Zureick, A.H. (2010), "Reliability-based evaluation of flexural members strengthened with externally bonded fiber-reinforced polymer composites", ASCE J. Struct. Eng., 136(9), 1151-1160. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000199
  39. Wieghaus, K.T. and Atadero, R.A. (2011), "Effect of existing structure and FRP uncertainties on the reliability of FRP-based repair", ASCE J. Compos. Constr., 15(4), 635-643. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000197
  40. Zhang, JW., Lu, ZT. and Zhu, H. (2001), "Experimental study on the behavior of RC torsional members externally bonded with CFRP", FRP Compos. Civil Eng., Elsevier Science, New York.