Stress-Prediction Model for Airport Pavements with Jointed Concrete Slabs
Publication: Journal of Transportation Engineering
Volume 136, Issue 7
Abstract
Two specific three-dimensional finite-element models are presented for making an evaluation of the maximum stresses at critical locations in concrete slabs (i.e., at the interior and edge) that is superior to the classic approach of the approximate methods. Concrete airport pavements with square-shaped slabs are studied. A homogeneous, isotropic elastic half-space is assumed as a subgrade (foundation) model so that the influence of variation in Young’s modulus is examined in contrast with Winkler’s reaction modulus. The effects of two aircrafts (A380 and B747), different subgrade bearing capabilities and temperature gradients , are investigated. Combined stresses due to aircraft load and temperature gradient are accurately estimated by means of a finite-element software and compared to their separate actions. As a consequence the incorrect applicability of the principle of effects superposition, which is due to the support soil that is nonresistant to tensile stress, is quantified. Moreover, the difference in the values of the stresses due to the two different aforementioned aircrafts is calculated. A simplified method for predicting maximum stresses is also derived from the results of the finite-element software. This predictive method represents a useful tool for a faster estimation of stresses at a preliminarily design level. The proposed equations make adjustments to Westergaard’s load stress model and Eisenmann’s temperature stress model necessary, as they also do for the separate actions of load and . The procedure makes use of dimensionless variables so that it may also be extended to different square-slab dimensions.
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Acknowledgments
The writers would like to thank the four anonymous referees whose comments proved invaluable.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 136 • Issue 7 • July 2010
Pages: 664 - 677
Copyright
© 2010 ASCE.
History
Received: May 28, 2008
Accepted: Feb 3, 2010
Published online: Mar 6, 2010
Published in print: Jul 2010
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