Structural Engineering and Mechanics

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Time-dependent bond transfer length under pure tension in one way slabs

  • Vakhshouri, Behnam (Centre for Built Infrastructure Research (CBIR), Faculty of Engineering and Information Technology (FEIT), University of Technology Sydney (UTS))
  • Received : 2016.03.11
  • Accepted : 2016.07.12
  • Published : 2016.10.25
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Abstract

In a concrete member under pure tension, the stress in concrete is uniformly distributed over the whole concrete section. It is supposed that a local bond failure occurs at each crack, and there is a relative slip between steel and surrounding concrete. The compatibility of deformation between the concrete and reinforcement is thus not maintained. The bond transfer length is a length of reinforcement adjacent to the crack where the compatibility of strain between the steel and concrete is not maintained because of partially bond breakdown and slip. It is an empirical measure of the bond characteristics of the reinforcement, incorporating bar diameter and surface characteristics such as texture. Based on results from a series of previously conducted long-term tests on eight restrained reinforced concrete slab specimens and material properties including creep and shrinkage of two concrete batches, the ratio of final bond transfer length after all shrinkage cracking, to THE initial bond transfer length is presented.

Keywords

Acknowledgement

Supported by : Centre for Built Infrastructure Research (CBIR)

References

  1. Alih, S. and Khelil, A. (2012), "Tension stiffening parameter in composite concrete reinforced with inoxydable steel: laboratory and finite element analysis", Canakkale, World Academy of Science, Engineering and Technology (WASET),
  2. Base, G.D. and Murray, M.H. (1982), "New look at shrinkage cracking", Symposium on Concrete 1981; Towards Better Concrete Structures, Adelaide, June.
  3. Beeby, A., Scott, R. and Jones, A. (2005), "Revised code provisions for long-term deflection calculations", Proceedings of the Institution of Civil Engineers-Structures and Buildings, 158(1), 71-75. https://doi.org/10.1680/stbu.2005.158.1.71
  4. Beeby, A.W. and Scott, R.H. (2005), "Cracking and deformation of axially reinforced members subjected to pure tension", Mag. Concrete Res., 57(10), 611-621. https://doi.org/10.1680/macr.2005.57.10.611
  5. Behfarnia, K. (2009), "The effect of tension stiffening on the behaviour of RC beams", Asian J. Civil Eng. (Build. Hous.), 10(3), 13.
  6. Bizindavyi, L. and Neale, K.W. (1999), "Transfer lengths and bond strengths for composites bonded to concrete", J. Compos. Constr., 3(4), 153-160. https://doi.org/10.1061/(ASCE)1090-0268(1999)3:4(153)
  7. Chan, H.C., Cheung, Y.K. and Huang, Y.P. (1992), "Crack analysis of reinforced concrete tension members", J. Struct. Eng., 118(8), 2118-2132. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:8(2118)
  8. Divakar, M. and Dilger, W. (1988), "Analysis of shrinkage deformations in concrete structures", Sadhana, 12(4), 307-320. https://doi.org/10.1007/BF02812168
  9. Eigelaar, E.M. (2010), "Deflections of Reinforced Concrete Flat Slabs", Stellenbosch University.
  10. Faver, R., Koprna, M. and Radojicic, A. (1983), "Effects differes, fissuration et deformations des structures en beton", Manual du Euro-International Du beton, Ecole Polytechnique Federale de Lausanne, Editions Georgi, Saint-Saphorin, Suisse.
  11. Gilbert, R. (2008), "Closure to "Tension stiffening in lightly reinforced concrete slabs" by R. Ian Gilbert", J. Struct. Eng., 134(7), 1264-1265. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:7(1264)
  12. Gilbert, R.I. (1992), "Shrinkage cracking in fully restrained concrete members", ACI Struct. J., 89(2), 141-149.
  13. Goto, Y. (1971), "Cracks formed in concrete around deformed tension bars", J. Proc., 68(4), 244-251..
  14. Kaklauskas, G. and Ghaboussi, J. (2001), "Stress-strain relations for cracked tensile concrete from RC beam tests", J. Struct. Eng., 127(1), 64-73. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:1(64)
  15. Kwak, H.G. and Filippou, F.C. (1990), "Finite element analysis of reinforced concrete structures under monotonic loads", Report on Research Conducted under Grant RTA-59M848 from the California Department of Transportation.
  16. Massicotte, B., Elwi, A.E. and MacGregor, J.G. (1990), "Tension-stiffening model for planar reinforced concrete members", J. Struct. Eng., 116(11), 3039-3058. https://doi.org/10.1061/(ASCE)0733-9445(1990)116:11(3039)
  17. Mihai, P., Hirhui, L. and Rosca, B. (2010), "Numerical analysis of bonding between concrete and reinforcement using the finite element method", J. Appl. Sci. (Faisalabad), 10(9), 738-744. https://doi.org/10.3923/jas.2010.738.744
  18. Nejadi, S. and Gilbert, R.I. (2004), "Shrinkage cracking and crack control in restrained reinforced concrete members", ACI Struct. J., 101(6), 840-845.
  19. Ngo, D. and Scordelis, A. (1967), "Finite element analysis of reinforced concrete beams", ACI J. Proc., 64(3), 152-163.
  20. Nie, J. and Cai, C.S. (2000), "Deflection of cracked RC beams under sustained loading", J. Struct. Eng., 126(6), 708-716. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:6(708)
  21. Nilson, A.H. (1968), "Nonlinear analysis of reinforced concrete by the finite element method", ACI J. Proc., 65(9), 757-766.
  22. Piyasena, R. (2002), "Crack spacing, crack width and tension stiffening effect in reinforced concrete beams and one way slabs", PhD Thesis, Griffith University.
  23. Scott, R. and Gill, P. (1987), "Short-term distributions of strain and bond stress along tension reinforcement", Struct. Eng., 65(2), 39-43.
  24. Sokolov, A., Kaklauskas, G., Idnurm, S., Gribniak, V. and Bacinskas, D. (2010), "Tension stiffening model based on test of RC beams", Modern Building Materials, Structures and Techniques Vilnius, The 10th international Conference, Lithuania.
  25. Vakhshouri, B. and Nejadi, S. (2014), "Limitations and uncertainties in the long term deflection calculation of concrete structures", Second International Conference on Vulnerability and Risk Analysis and Management (ICVRAM) and the Sixth International Symposium on Uncertainty, Modeling, and Analysis (ISUMA),
  26. Wang, H. (2009), "An analytical study of bond strength associated with splitting of concrete cover", Eng. Struct., 31(4), 968-975. https://doi.org/10.1016/j.engstruct.2008.12.008
  27. Wenkenbach, I. (2011), "Tension stiffening in reinforced concrete members with large diameter reinforcement", Master Thesis, Durham University.

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