Fatigue Life Evaluation for Deck-Rib Welding Details of Orthotropic Steel Deck Integrating Mean Stress Effects
Publication: Journal of Bridge Engineering
Volume 24, Issue 2
Abstract
The early fatigue cracking of orthotropic steel decks has been a long-standing problem for heavy traffic regions of China’s long-span bridges. However, the actual fatigue life is much lower than the fatigue life calculated by fatigue design codes. In this study, a modified full range S-N curve, the M-S-N method, is proposed to evaluate welded joint fatigue life, considering mean stress, which is based on metal fatigue theory. As an example, a combined shell-solid finite-element model of a segmental bridge is first built for the Jiangyin Bridge to obtain the real stress, integrating welding residual stress and vehicle load stress. The fatigue life is then calculated and compared in order to consider the influence of different vehicle loads and deck-plate thicknesses. The calculation results show that the fatigue life of the deck-rib welded joint in the Jiangyin Yangtze River Bridge decreases nonlinear at a staggering rate with the increase in vehicle load. Under the condition of severe overload heavy vehicles, the Jiangyin Bridge fatigue life is only 2.17 years according to the M-S-N method, which matches practical situations. Deck-rib fatigue life obviously increases with the increase in deck thickness. The current steel bridge deck design with a 16-mm-thick plate is not safe under heavy traffic conditions.
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Acknowledgments
The authors gratefully acknowledge the National Basic Research Program of China (973 Program) (2015CB060000), the Key Program of National Natural Science Foundation (51438002), the Program of National Natural Science Foundation (51578138, 51508251, and 51608258), the Fundamental Research Fund for the Central Universities (2242016K41066), the Fundamental Research Funds for the Central Universities and graduates’ Science and Innovation Foundation of Jiangsu Province (KYLX16_0250), and the A Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (1105007002).
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 2 • February 2019
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jan 22, 2018
Accepted: Aug 3, 2018
Published online: Nov 27, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 27, 2019
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