Reliability Estimation of Horizontal Rotation at Beam End of Long-Span Continuous Truss Bridge Affected by Temperature Gradients
Publication: Journal of Performance of Constructed Facilities
Volume 33, Issue 6
Abstract
The horizontal rotation angle (HRA) exceeding the design limit can result in the failure of a rail fastening system and irregularity of the track geometry state. In the traditional view, the temperature field in a steel truss is usually considered as uniform, but some monitoring results have shown that a steel truss bridge can contain remarkable temperature gradients, which may have a significant effect on horizontal rotation. The influence of temperature gradients on HRA at the beam end of a steel truss bridge was thoroughly studied. A monitoring data analysis was carried out to identify which types of temperature gradients contain remarkable values in the steel truss; a correlation analysis was carried out to reveal which types of temperature gradients have a dominant influence on HRA; and a reliability analysis was carried out to determine whether the HRA in the real environment can exceed the design limit in the entire lifetime. The results show that HRA is dominantly affected by the transverse temperature gradient between the bottom chords and the transverse temperature gradient between the top chords in the side trusses. The reliability estimation result shows that the HRA in the real environment will not exceed the design limit during its entire lifetime.
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Acknowledgments
The authors gratefully acknowledge the Natural Science Foundation of Jiangsu Province of China (BK20180652), the China Postdoctoral Science Foundation (2017M621865), and the Jiangsu Planned Projects for Postdoctoral Research Funds.
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Published In
Journal of Performance of Constructed Facilities
Volume 33 • Issue 6 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 27, 2018
Accepted: Mar 12, 2019
Published online: Aug 23, 2019
Published in print: Dec 1, 2019
Discussion open until: Jan 23, 2020
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