The use of Grade 380 steel for transverse confining reinforcement in columns

  • F. A. Zahn Ministry of Works and Development, Wellington, New Zealand
  • R. Park University of Canterbury, Christchurch, New Zealand
  • M. J. N. Priestley University of California, San Diego, USA

Abstract

The results of recent experimental and analytical studies of the stress-strain behaviour of concrete confined by New Zealand manufactured Grade 275 or Grade 380 reinforcing steel are presented. First, the behaviour of three pairs of concentrically loaded reinforced concrete columns containing spirals from either Grade
275 or Grade 380 steel are compared, including the stage at which spiral fracture occurred. Second, the results of tests on four reinforced concrete columns containing Grade 380 spiral or rectangular hoop reinforcement and subjected to combined axial
load and cyclic lateral loading are reported. An analytical
study which was conducted to determine the available curvature ductility factor at the stage of fracture of the transverse reinforcement is described. The results are used to give a guideline for the safe use of Grade 380 steel as transverse confining reinforcement.

References

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Park, R. and Paulay, T., "Reinforced Concrete Structures", John Wiley, New York, 1975, p.769. DOI: https://doi.org/10.1002/9780470172834

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Park, R., Priestley, M.J.N., Gill, W.D. and Potangaroa, R.T., "Ductility and Strength of Reinforced Concrete Columns With Spirals or Hoops Under Seismic Loading", Proceedings of 7th World Conference on Earthquake Engineering, Vol. 7, Istanbul, September 1980, pp.15-22.

Zahn, F.A., Park, R. and Priestley, M.J.N., "Design of Reinforced Concrete Bridge Columns for Strength and Ductility", Research Report 86-7, Department of Civil Engineering, University of Canterbury, March 198 6, p.330 plus appendices.

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Published
1987-06-30
How to Cite
Zahn, F. A., Park, R., & Priestley, M. J. N. (1987). The use of Grade 380 steel for transverse confining reinforcement in columns. Bulletin of the New Zealand Society for Earthquake Engineering, 20(2), 99-115. https://doi.org/10.5459/bnzsee.20.2.99-115
Section
Articles

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