Fatigue Reliability Assessment of Long-Span Steel-Truss Suspension Bridges under the Combined Action of Random Traffic and Wind Loads
Publication: Journal of Bridge Engineering
Volume 25, Issue 3
Abstract
This paper presents an efficient framework for the fatigue reliability assessment of typical long-span steel-truss suspension bridges under the combined action of random traffic and wind loads based on a stress analysis approach. The Aizhai Bridge in China was selected as an example to demonstrate the numerical procedure for this framework. In the numerical analysis, the critical locations of the bridge were first determined by refined finite-element analyses, and 30,000 samples of random input parameters (random wind field and traffic flow) were generated. Subsequently, the corresponding dynamic stress responses at the critical locations of the bridge were obtained via a stress analysis approach under the combined action of random traffic and wind loads. Finally, the fatigue reliability of the bridge was assessed considering the influence of the wind load, traffic growth, and vehicle axle load growth. The results show that both the wind and traffic loads have certain effects on the fatigue reliability of the bridge. The upper and lower chords of the main truss at one-fourth of the span, which is sensitive to both the wind and vehicle loads, should be given more attention.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request, including the finite-element model of the Aizhai Bridge, the statistical data of traffic volume, the data of wind field samples, and the data of dynamic stress response samples.
Acknowledgments
This work described in this paper is supported by the Key Basic Research Project (973 project) of PR China, under Contract Nos. 2015CB057701 and 2015CB057706. The authors would also like to gratefully acknowledge the support from the National Natural Science Fund of China (Nos. 51678079, 51778073, 51822803, and 51978087), Natural Science Fund of Hunan for Distinguished Young Scholars (No. 2018JJ1027) and the Outstanding Youth Fund project from the Hunan Provincial Department of Education (No. 16B011).
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Published In
Journal of Bridge Engineering
Volume 25 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Nov 16, 2018
Accepted: Sep 6, 2019
Published online: Jan 6, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 6, 2020
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