Long‐Term Shortening of Concrete Columns in Tall Buildings
Publication: Journal of Structural Engineering
Volume 119, Issue 7
Abstract
The accurate estimation of the long‐term shortening of the vertical members of tall concrete buildings is often an important issue in their design. Differences in the shortening of adjacent columns or between columns and the shear core can induce significant moments and shears in connecting floor slabs or beams. The effects of such differential vertical movements have to be carefully considered where adjacent vertical members are closely spaced, carry different loads, or have different cross sections. The total shortening of concrete columns consists of the sum of the instantaneous axial deformations and the deformations induced by creep and shrinkage. The paper describes a method for the prediction of the long‐term axial deformations of reinforced concrete columns of tall buildings. The method is based on the incremental superposition procedure in which the stresses due to loads and creep and shrinkage are assumed to vary discretely at selected instants of time. Predicted values are shown to be in good agreement with column shortening measured in a tall building.
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References
1.
Bakoss, S. L., Brady, E. A., Burfitt, A. J., and Cridland, L. (1984). “Long‐term deflections of a 32 story high concrete building.” RILEM‐ACI Symp. on Long‐term Observation of Concrete Structures, Am. Concrete Inst., Detroit, Mich., 186–200.
2.
Fintal, M., and Khan, F. R. (1971). “Effects of column creep and shrinkage in tall structures‐analysis for differential shortening of columns and field observation of structures.” SP‐27; Designing for effects of creep, shrinkage and temperature in concrete structures, Am. Concrete Inst., Detroit, Mich., 95–119.
3.
Pfeifer, D. W., Magura, D. D., Russell, H. G., and Corley, W. G. (1971). “Time dependent deformations in a 70 story structure.” SP‐27‐7, Am. Concrete Inst., Detroit, Mich., 159–184.
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Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 2, 1992
Published online: Jul 1, 1993
Published in print: Jul 1993
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