Analytical Study of Uniform Thermal Effects on Cable Configuration of a Suspension Bridge during Construction
Publication: Journal of Bridge Engineering
Volume 24, Issue 11
Abstract
The cable configuration of a suspension bridge is very sensitive to temperature changes. On the basis of multisegment catenary theory in combination with the conditions of geometric compatibility, mechanical equilibrium, and conservation of the unstrained cable length, an analytical method is proposed to model the temperature sensitivity of the cable configuration of suspension bridges. The main considerations were the elevation of the main cable and installation positions of cable clamps. The proposed method can adapt to different construction states (the completion state of the bridge, the free cable state, and the datum cable strand), boundary conditions (considering or not considering the saddle arc), and the stiffness of the towers (considering or not considering tower bending deformation). It is possible to switch between different cases by changing only a few parameters. An engineering example analysis was then performed for a suspension bridge with a main span of 730 m, which demonstrated the feasibility and effectiveness of the proposed method. The results showed that the deformation of the suspension bridge had a linear relationship with temperature. The construction state and bending deformation of the towers had a large impact on the temperature sensitivity coefficient of the main cable elevation. The bending deformation of the towers aggravated and lessened the temperature sensitivity coefficient of the main cable elevation for the main span and side span, respectively. The temperature sensitivity coefficient of midspan point elevation of the main cable correlated negatively to the span length. The maximum temperature sensitivity coefficient of the installation position of the cable clamp occurred near the interquartile point of the main span.
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Acknowledgments
The research described in this paper was financially supported by the NSFC under the grant 51678148, a project supported by the Natural Science Foundation of Jiangsu Province (BK20181277), and the National Key R. & D Program of China (2017YFC0806009), which are gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 11 • November 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Dec 23, 2018
Accepted: Jun 6, 2019
Published online: Sep 3, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 3, 2020
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