Aesthetics and Torsional Rigidity Improvements of a Triple-Cable Suspension Bridge by Uniform Distribution of Dead Loads to Three Cables in the Transverse Direction
Publication: Journal of Bridge Engineering
Volume 26, Issue 11
Abstract
Suspension bridges with three cable planes provide an excellent solution to the suspension bridges’ downwarp problem with ultrawide decks, which implies their enormous demand and popularization prospect in the engineering scenarios. In this paper, a method for uniform allocation of dead load in the transverse direction to three cables of the suspension bridge with three cable planes (SB-3CP), which transforms the spatial stress mode into a plane model to simplify the calculation, is proposed. By altering the cross-sectional area of each hanger, the axial forces of the three hangers in the same cross section of the SB-3CP are equal. Therefore, the cross-sectional area and shape of the three cables are equal, improving the suspension bridge outlook in both the cross-sectional and facade views of the suspension bridge. Meanwhile, under the uniform allocation of the dead load, the side main cable bears a higher share of the dead load, which is conducive to improving the entire bridge’s torsional rigidity. In this study, conditions for compatibility of deformation and energy conservation are utilized to derive the relationship between the axial rigidity of the three hangers in the same cross sections. The effects of axial rigidity of hangers, flexural rigidity of the deck in the transverse direction, and length between the hanging points on the difference in the axial rigidities of the three hangers are analyzed and discussed in detail. Finally, an SB-3CP with a main span of 2,320 m and a width of 75 m was taken as an example. The cross-sectional areas of each hanger of the bridge were calculated using the proposed method. Then, its accuracy was validated through the finite-element analysis. This method’s design effect was verified by comparing the differences in the main cable diameter and torsional rigidity between the SB-3CP with uniform and nonuniform dead load distributions.
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Acknowledgments
The work described in this paper was financially supported by the National Natural Science Foundation of China under Grant Nos. 52078134 and 51678148, the Natural Science Foundation of Jiangsu Province (Grant No. BK20181277), and the National Key R&D Program of China (Grant No. 2017YFC0806009), which are gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 11 • November 2021
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© 2021 American Society of Civil Engineers.
History
Received: Feb 19, 2021
Accepted: Aug 4, 2021
Published online: Sep 7, 2021
Published in print: Nov 1, 2021
Discussion open until: Feb 7, 2022
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