Research Article
Jun 1976
Effect of Foundation Stiffness on Track Buckling
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VIEW THE REPLYPublication: Journal of the Engineering Mechanics Division
Volume 102, Issue 3
Abstract
The present paper deals with the effect of releasing the constraining assumption of using an infinitely rigid foundation in the analysis of vertical buckling of a railroad track due to constrained thermal expansion. The chosen foundation is of the Winkler type. The buckled configuration is assumed to consist of two regions, i.e., a lift-off region and an attached region. The foundation resistance to the longitudinal displacement of the track is assumed to be linear. The problem is treated as a variational problem with variable end points for which the variational formulation yields a consistent set of differential equations and boundary conditions. It is found that a decrease in the foundation stiffness will increase the safe buckling temperature. However, for the working range of an actual foundation, this increase is small and the assumption of an infinitely rigid base can be used to predict a close lower bound for the safe buckling temperature.
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Published In
Journal of the Engineering Mechanics Division
Volume 102 • Issue 3 • June 1976
Pages: 531 - 545
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Jun 1976
Published online: Feb 3, 2021
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Yehia M. El-Aini
Project Engr., Sundstrand Aviation, Rockford, Ill.; formerly, Assoc. Research Scientist, Dept. of Civ. Engrg., Princeton Univ., Princeton, N.J.
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