Materials and Structures

, 26:557 | Cite as

Cyclic loading of laterally confined concrete columns

  • H. K. Cheong
  • S. H. Perry
Technical Notes

Abstract

The behaviour under cyclic load of stub concrete columns confined laterally by a novel method of reinforcement is described. The columns were confined by an orthogonal system of steel bolts, and were loaded axially in compression in slow cycles. These were compared with similar columns loaded to failure monotonically in compression. It was found that the columns exhibited a large energy absorption and dissipation capacity. The concept of an envelope curve can be applied to the cyclic behaviour of the reinforced columns, both in terms of axial stress-strain behaviour and the development of confining pressures. The paper also deals with energy dissipation and stiffness degradation in the columns during cycling, together with the prediction of the residual strain.

Keywords

Longitudinal Strain Strain Ratio Plain Concrete Concrete Column Load Amplitude 

Principal Notation

σ1

Longitudinal stress in the column

σ1m

Longitudinal stress in the column at maximum load

σs

Stress in the steel bolt

ε1

Longitudinal strain in the column

ε1m

Longitudinal strain in the column at maximum load

ε1m

Longitudinal strain in the column at maximum load (monotonic case)

ε1E

Longitudinal strain to which column is taken in a loading cycle

ε1R

Residual longitudinal strain at the end of an unloading cycle

Pcr

Load at first visible cracking

Ei

Longitudinal stiffness of the column at the start of loading or reloading

Resume

On décrit le comportement sous chargement cyclique de tronçons de colonnes en béton confinés latéralement par une nouvelle méthode de renforcement. Les colonnes ont été confinées par un système orthogonal d’ancrages en acier, et soumises à une charge axiale en compression avec des cycles lents. On compare ces colones à des colonnes similaires chargées à la rupture en compression monotone.

On a observé que les colonnes présentaient une absorption d’énergie et une capacité de dissipation importantes. Le concept de courbe enveloppe peut s’appliquer au comportement cyclique de colonnes armées, à la fois en fonction du comportement contrainte/déformation axiale et du développement de pressions de confinement.

L’article traite également de la dissipation de l’énergie et de la détérioration de la rigidité dans les colonnes pendant les cycles, ainsi que de la prédiction de la déformation résiduelle.

References

  1. 1.
    Sinha, B. P., Gerstle, K. H. and Tulin, L. G., ‘Stress-strain relations for concrete under cyclic loading’,J. Amer. Concr. Inst. 61 (2) (1964) 195–210.Google Scholar
  2. 2.
    Karsan, I. D. and Jirsa, J. O., ‘Behaviour of concrete under compressive loadings’,Proc. Amer. Soc. Civ. Engrs, J. Struct. Div. 95 (ST12) (1969) 2543–2563.Google Scholar
  3. 3.
    Buyukozturk, O. and Tseng, T. M. ‘Concrete in biaxial cyclic compression’,-ibid. 110 (3) (1984) 461–476.Google Scholar
  4. 4.
    Desayi, P., Iyengar, K. T. S. R. and Reddy, T. S., ‘Stress-strain characteristics of concrete confined in steep spirals under repeated loading’,Mater. Struct. 12 (71) (1979) 375–383.Google Scholar
  5. 5.
    Shah, S. P., Fafitis, A. and Arnold, R., ‘Cyclic loading of spirally reinforced concrete’,Proc. Amer. Soc. Civ. Engrs, J. Struct. Div. 109 (7) (1983) 1695–1710.Google Scholar
  6. 6.
    Green, N. B., ‘Some structural effects of the San Francisco earthquake’,J. Amer. Concr. Inst. 69 (5) (1972) 278–284.Google Scholar
  7. 7.
    Priestley, M. J. N., Park, R. and Potangaroa, R. T., ‘Ductility of spirally confined concrete columns’,Proc. Amer. Soc. Civ. Engrs, J. Struct. Div. 107 (ST1) (1981) 181–202.Google Scholar
  8. 8.
    Cheong, H. K., ‘Laterally Confined Concrete Prisms under Various Axial Load Conditions’, PhD thesis, University of London (1985).Google Scholar
  9. 9.
    Cheong, H. K. and Perry, S. H., ‘Concrete columns with lateral prestressing’,Proc. Amer. Soc. Civ. Engrs, J. Engng Mech. 117 (1) (1991) 70–87.Google Scholar
  10. 10.
    Perry, S. H. and Cheong, H. K., ‘Stress-strain behaviour of laterally confined concrete columns’,Mag. Concr. Res. 43 (156) (1991) 187–196.CrossRefGoogle Scholar
  11. 11.
    Perry, S. H., Armstrong, W. E. and Harris, A. J., ‘Axially loaded concrete columns with non-uniform lateral confinement’,Proc. Instn Civ. Engrs 82 (1987) 243–262.Google Scholar
  12. 12.
    Spooner, D. C. and Dougill, J. W., ‘A quantitative assessment of damage sustained in concrete during compressive loading’,Mag. Concr. Res. 27 (92) (1985) 151–160.Google Scholar

Copyright information

© RILEM 1993

Authors and Affiliations

  • H. K. Cheong
    • 1
  • S. H. Perry
    • 2
  1. 1.Nanyang Technological UniversitySingapore
  2. 2.Department of Civil, Structural and Environmental EngineeringTrinity College (University of Dublin)Dublin 2Republic of Ireland

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