Longitudinal Stiffness of Multispan Suspension Bridges
Publication: Journal of Bridge Engineering
Volume 21, Issue 5
Abstract
The longitudinal stiffness of multispan suspension bridges plays an important role in load-resisting systems. In this paper, a model defined as the kinematic multispring (KMS) model is proposed for simulating the longitudinal deformation behavior of multispan suspension bridges. Tower springs and cable springs constitute a series-parallel system in the KMS model. The stiffness formulas for cable springs were derived on the basis of the energy principle. The elastic elongation of the cable was considered and proved to be nonnegligible, especially for long-span bridges. The effect of the inclined angle of the cables was first considered in the formulas for the cable elastic stiffness. The elastic stiffness and the geometric stiffness of the cables were found to be relevant. Compared with numerical models, the KMS model proposed in this paper was proven to be accurate and applicable.
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Acknowledgments
The authors express their sincere gratitude for the financial support provided by the National Natural Science Foundation of China (Grants 51138007 and 51222810) and the Twelfth Five-Year plan major projects supported by National Science and Technology (Grant 2011BAJ09B02).
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 5 • May 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 30, 2015
Accepted: Oct 21, 2015
Published online: Jan 20, 2016
Published in print: May 1, 2016
Discussion open until: Jun 20, 2016
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