Research Article
Aug 1967
Vibration of Suspension Bridges under Moving Loads
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VIEW THE REPLYPublication: Journal of the Structural Division
Volume 93, Issue 4
Abstract
The problem relates to the transient vibration of a single-span suspension bridge which is traversed by a constant force moving with constant velocity or a pulsating force moving with constant velocity. Damping is zero and there is no mass associated with the moving forces. Equations of motion are derived and solved. Solutions are obtained for the deflections and stresses of the truss and for the increase in horizontal component of cable tension. The theory is based on the deflection theory equations of suspension bridges. It is linearized by assuming that the increase in cable tension due to live load is small compared to the dead load cable tension. A numerical example illustrates the theory. The results of the example show large magnifications of stress (on the order of 2.70) when the moving pulsating force is driven at the frequency of the first symmetric mode. Also, in general, there is no appreciable dynamic effect associated with moving constant forces on long-span bridges. The dynamic effect of moving constant forces, however, becomes more pronounced on short-span bridges having a low frequency associated with the first asymmetric mode.
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Published In
Journal of the Structural Division
Volume 93 • Issue 4 • August 1967
Pages: 123 - 138
Copyright
© 1967 American Society of Civil Engineers.
History
Published in print: Aug 1967
Published online: Feb 1, 2021
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Authors
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Joseph Vellozzi
Structural Engr., Ammann and Whitney, New York, N. Y., and Adjunct Prof. of Civ. Engrg., The Cooper Union, New York, N. Y.
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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.
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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.