Research Article
Apr 1980
Vibrations of Curved Spans for Mass Transit
Publication: Journal of the Engineering Mechanics Division
Volume 106, Issue 2
Abstract
Nondimensional dynamic responses of simple and multiply-supported, horizontally curved beams with moving loads are measured in laboratory-scale experiments. Effects of system parameters involving span stiffness, arc length, frequency, end support constraints, and various transit load speeds and spacings are investigated. For critical combinations of certain parameters, adverse coupling of bending and torsional span responses are observed. For instance, as critical load speeds are approached, measured twist angles and bending strains at midspan approach unboundedness for multiple spans, but are bounded for equivalent simple spans placed end-to-end. Calculations based on Bernoulli-Euler curved beam theory (with negligible warping rigidity) complement these simple span measurements. Experiments also include multiple spans with up to 90? turns, subject to both transit point loads in tandem and sprung vehicles. Results are applicable to dynamic span designs for mass transit systems.
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Published In
Journal of the Engineering Mechanics Division
Volume 106 • Issue 2 • April 1980
Pages: 255 - 272
Copyright
© 1980 American Society of Civil Engineers.
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Published in print: Apr 1980
Published online: Feb 3, 2021
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Authors
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Thomas P. Joseph, AM.ASCE
Assoc. Engr., Howard Needles Tammen and Bergendoff, Charleston, W. Va.
James F. Wilson, M.ASCE
Prof., School of Engrg., Duke Univ., Durham, N.C.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.