Structural Engineering and Mechanics

  • 제65권3호
  • /
  • Pages.315-325
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  • 2018
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Prediction of flexural behaviour of RC beams strengthened with ultra high performance fiber reinforced concrete

  • Murthy A, Ramachandra (CSIR-Structural Engineering Research Centre) ;
  • Aravindan, M. (AcSIR, CSIR-Structural Engineering Research Centre) ;
  • Ganesh, P. (AcSIR, CSIR-Structural Engineering Research Centre)
  • 투고 : 2017.07.20
  • 심사 : 2017.11.28
  • 발행 : 2018.02.10
⟨ 이전 논문 다음 논문 ⟩

초록

This paper predicts the flexural behaviour of reinforced concrete (RC) beams strengthened with a precast strip of ultra-high performance fiber-reinforced concrete (UHPFRC). In the first phase, ultimate load capacity of preloaded and strengthened RC beams by UHPFRC was predicted by using various analytical models available in the literature. RC beams were preloaded under static loading approximately to 70%, 80% and 90% of ultimate load of control beams. The models such as modified Kaar and sectional analysis predicted the ultimate load in close agreement to the corresponding experimental observations. In the second phase, the famous fatigue life models such as Papakonstantinou model and Ferrier model were employed to predict the number of cycles to failure and the corresponding deflection. The models were used to predict the life of the (i) strengthened RC beams after subjecting them to different pre-loadings (70%, 80% and 90% of ultimate load) under static loading and (ii) strengthened RC beams after subjecting them to different preloading cycles under fatigue loading. In both the cases precast UHPFRC strip of 10 mm thickness is attached on the tension face. It is found that both the models predicted the number of cycles to failure and the corresponding deflection very close to the experimental values. It can be concluded that the models are found to be robust and reliable for cement based strengthening systems also. Further, the Wang model which is based on Palmgren-Miner's rule is employed to predict the no. of cycles to failure and it is found that the predicted values are in very good agreement with the corresponding experimental observations.

키워드

참고문헌

  1. Alaee, F.J. (2003a), "Fracture model for flexural failure of beams retrofitted with CARDIFRC", J. Eng. Mech., 129, 1028-1038. https://doi.org/10.1061/(ASCE)0733-9399(2003)129:9(1028)
  2. Alaee, F.J. and Karihaloo, B.L. (2003), "Retrofitting of reinforced concrete beams with CARDIFRC", J. Compos. Constr, 7, 174-186. https://doi.org/10.1061/(ASCE)1090-0268(2003)7:3(174)
  3. Almusallam, T.H. and Salloum, Y.A. (2001), "Ultimate strength prediction for RC beams externally strengthened by composite materials", Compos. Part B-Eng., 32, 609-619. https://doi.org/10.1016/S1359-8368(01)00008-7
  4. Attari, N., Amaziane, S. and Chemrouk, M. (2012), "Flexural strengthening of concrete beams using CFRP, GFRP and hybrid FRP sheets", Constr. Build. Mater., 37, 746-757. https://doi.org/10.1016/j.conbuildmat.2012.07.052
  5. Bakis C.B., Brown, L., Cosenza, V., Davalos, E. and Lesko, J. (2002), "Fiber-reinforced polymer composites for construction-state of art review", J. Compos. Constr., 6, 73-87. https://doi.org/10.1061/(ASCE)1090-0268(2002)6:2(73)
  6. Balaguru, B. and Shah, S.P. (1982), "A method of predicting crack width and deflections for fatigue loading", ACI Spec. Publ., 75(5), 153-175.
  7. Barenblatt, G.I. (1959), "On equilibrium cracks forming during brittle fracture", J. Appl. Math. Mech., 23, 434-444.
  8. Benson, S.D.P. and Karihaloo, B.L. (2005), "CARDIFRC-Development and mechanical properties. Part I: Development and workability", Mag. Concrete Res., 57(6), 347-352. https://doi.org/10.1680/macr.2005.57.6.347
  9. Bosco, C. and Carpinteri, A. (1992), "Fracture mechanics evaluation of minimum reinforcement in concrete structures", Proceedings of the International Workshop on Application of fracture mechanics to reinforced concrete, Turin, Italy.
  10. Buyukozturk, O. and Hearing, B. (1998), "Failure behavior of precracked concrete beams with FRP", J. Compos. Constr., 2-3, 138-144.
  11. CEB-FIP Model Code (1993), Lausanne, Switzerland.
  12. Cheng, L. (2011), "Flexural fatigue analysis of a CFRP form reinforced concrete bridge deck", Compos. Struct., 93, 2895-2902. https://doi.org/10.1016/j.compstruct.2011.05.014
  13. Deng, Z.C. (2005), "The fracture and fatigue performance in flexure of carbon fiber reinforced concrete", Cement Concrete Compos., 27, 131-140. https://doi.org/10.1016/j.cemconcomp.2004.03.002
  14. Dong, J.F., Wang, Q.Y. and Guan, Z.W. (2012), "Structural behavior of RC beams externally strengthened with FRP sheets under fatigue and monotonic loading", Eng. Struct., 41, 24-33. https://doi.org/10.1016/j.engstruct.2012.03.024
  15. Dong, Y., Ansari, F. and Karbhari, V.M. (2011), "Fatigue performance of reinforced concrete beams with externally bonded CFRP reinforcement", Struct. Infrastruct. E, 7(3), 229-241. https://doi.org/10.1080/15732470802383669
  16. El-Refai, J. and West, K.S. (2012), "Fatigue of reinforced concrete beams strengthened with externally post-tensioned CFRP tendons", Constr. Build. Mater., 29, 246-256. https://doi.org/10.1016/j.conbuildmat.2011.10.014
  17. Ferrier, E., Bigaud, D., Clement J.C. and Hamelin, P. (2011), "Fatigue-loading effect on RC beams strengthened with externally bonded FRP", Constr. Build. Mater., 25, 539-546. https://doi.org/10.1016/j.conbuildmat.2010.07.035
  18. Guinea, G.V., Pastor, J.Y., Planas, J. and Elices, M. (1998), "Stress intensity factor, compliance and CMOD for a general three-point-bend beam", J. Fract., 89, 103-116. https://doi.org/10.1023/A:1007498132504
  19. Hangsoeb, O., Jongsung, S. and Christian, M. (2005), "Fatigue life of damaged bridge deck panels strengthened with carbon fiber sheets", ACI Struct. J., 102(1), 85-92.
  20. Kaar, P.H. and Mattock, A.H. (1963), "High strength bar as concrete reinforcement, Part 4. Control of cracking", J. PCA Res. Dev. Lab., 7(1), 15-38.
  21. Kevin, Z., Arash, E.Z. and Kay, W. (2015), "Rehabilitation of steel bridge girders with corroded ends using ultra-high performance concrete", Struct. Congr., 1411-1422.
  22. Lange-Kornbak, D. and Karihaloo, B.L. (1999), "Fracture mechanical prediction of transitional failure and strength of singly-reinforced beams", Minimum Reinforcement in Concrete Members, ESIS Publication 24, A. Carpinteri, Ed., Elsevier, London, 31-42.
  23. Leung, C.K.Y., Cheung, Y.N. and Zhang, J. (2007), "Fatigue enhancement of concrete beam with ECC layer", Cement Concrete Res., 37, 743-750. https://doi.org/10.1016/j.cemconres.2007.01.015
  24. Leung, C.K.Y. (1998), Delamination Failure in Concrete Beams Retrofitted with a Bonded Plate, Fracture Mechanics of Concrete Structures, AEDIFICATIO Publishers, Freiburg, Germany, 3, 1783-1792.
  25. Liu, F. and Zhou, J. (2016), "Fatigue strain and damage analysis of concrete in reinforced concrete beams under constant amplitude fatigue loading", Shock Vibr., 2016, 73-79.
  26. Manfredi, G. and Pecce, M. (1997), "Low cycle fatigue of RC beams in NSC and HSC", Eng. Struct., 19(3), 217-223. https://doi.org/10.1016/S0141-0296(96)00081-8
  27. Nanni, A. (2003), "Concrete repair with externally bonded FRP reinforcement: Examples from Japan", Concrete Int., 97, 22-26.
  28. Papakonstantinou, C.G., Balaguru, P.N. and Petrou, M.F. (2002), "Analysis of reinforced concrete beams strengthened with composites subjected to fatigue loading", ACI Spec. Publ., 206, 41-60.
  29. Prem, P.R., Ramachandra Murthy, A., Ramesh, G., Bharatkumar, B.H. and Nagesh, R.I. (2015), "Flexural behaviour of damaged RC beams strengthened with ultra-high performance concrete", Ind. Concrete J., 2057-2069.
  30. Ramachandra Murthy, A., Karihaloo, B.L., Nagesh, R.I. and Raghu Prasad, B.K. (2013), "Bilinear tension softening diagrams of concrete mixes corresponding to their size-independent specific fracture energy", Constr. Build Mater., 47, 1160-1166. https://doi.org/10.1016/j.conbuildmat.2013.06.004
  31. Shahawy, M. and Beitelman, T.E. (1999), "Static and fatigue performance of RC beams strengthened with CFRP laminates", J. Struct. Eng., 125, 613-625. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:6(613)
  32. Shannag, M.J., Al-Akhras, N.M. and Mahdawi, S.F. (2014), "Flex ure strengthening of lightweight reinforced concrete beams using carbon fibre-reinforced polymers", Struct. Infrastr. E, 10(5), 604-613. https://doi.org/10.1080/15732479.2012.757790
  33. Shin, H.O., Yoon, Y.S. and Cook, W.D. (2015), "Effect of confinement on the axial load response of ultrahigh-strength concrete columns", J. Struct. Eng., 141(6), 04014151-12 https://doi.org/10.1061/(ASCE)ST.1943-541X.0001106
  34. Tada, H., Paris, P.C. and Irwin, G.R. (1985), The Stress Analysis of Cracks-Handbook, Paris Productions Incorporated, St. Louis, Missouri, U.S.A.
  35. Wang, W., Wu, S.G. and Dai, H.Z. (2006), "Fatigue behaviour and life prediction of carbon fiber reinforced concrete under cyclic flexural loading", Mater. Sci. Eng. A, 434, 347-351. https://doi.org/10.1016/j.msea.2006.07.080
  36. Wang, W. and Huang, H. (2015), "Fatigue life prediction of RC beams strengthened with externally bonded FRP sheets", Proceedings of the International Conference on Performance-based and Life-cycle Structural Engineering, Brisbane, QLD, Australia, 522-528
  37. Xu, S.L., Wang, N. and Zhang, X.F. (2012), "Flexural behavior of plain concrete beams strengthened with ultra-high toughness cementitious composites layer", Mater. Struct., 45, 851-859. https://doi.org/10.1617/s11527-011-9803-0