Creep Buckling of Shallow Parabolic Concrete Arches
Publication: Journal of Structural Engineering
Volume 132, Issue 10
Abstract
This paper addresses, both theoretically and experimentally, the buckling of shallow concrete arches that may occur due to the effects of creep and shrinkage deformations of the concrete. Under sustained loading, these viscoelastic effects cause time-dependent changes of the deflections of a shallow arch and can lead to the establishment of a geometric configuration at which the arch is no longer stable, and which heralds the onset of creep buckling. By using a virtual work formulation, the equilibrium and buckling equations of an arch with horizontal spring supports are derived in closed form, and using the algebraically tractable age-adjusted effective modulus method to model the time-dependent behavior of the concrete allows the buckling load and the prebuckled life of the arch to be determined using prescriptive equations. Long-term tests on three span arches under sustained loading are described. Each arch failed because of creep buckling several months after first loading. These tests are used to validate the theory developed in the paper and to provide benchmark data for calibration. The study shows that creep and shrinkage of the concrete have a profound influence on the structural behavior of shallow concrete arches.
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Acknowledgments
The work reported in this paper was supported by the Australian Research Council (ARC) through a Discovery Project awarded to the second and third writers, and by an ARC Federation Fellowship and an ARC Professorial Fellowship awarded to the second and third writers.
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© 2006 ASCE.
History
Received: Jul 19, 2005
Accepted: Nov 21, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Dat Duthinh
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