Fatigue Damage Evaluation of Orthotropic Steel Deck Considering Weld Residual Stress Relaxation Based on Continuum Damage Mechanics
Publication: Journal of Bridge Engineering
Volume 23, Issue 10
Abstract
Weld residual stresses (WRSs) in orthotropic steel decks (OSDs) contribute prominently to fatigue damage. WRSs relax during the accumulation of fatigue damage. However, their effects are ignored in conventional methods of fatigue damage evaluation. This paper presents the first evaluation approach to fatigue damage that considers of the relaxation of WRSs. WRSs were analyzed using a thermomechanical analysis that took into account the relaxation of WRS. An elastic–plastic fatigue damage model was developed using continuum damage mechanics. The proposed model of fatigue damage was experimentally validated using fatigue tests on U-rib weld connection specimens under different cyclic loading conditions. The test results indicated the feasibility of the elastic–plastic fatigue damage model for predicting WRSs and fatigue damage in OSDs. Ignoring the effects of WRSs may result in the overestimation of fatigue life, resulting in structural designs that are not conservative enough.
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Acknowledgments
This research was funded by the China National Science Foundation [Grants 51778533 and 51578455], China Fundamental Research Funds for the Central Universities [Grant 2682014CX078]. The first author acknowledges the Chinese Scholarship Council (CSC) [Grant 201607000082] for providing financial support.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 10 • October 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Oct 18, 2017
Accepted: Mar 30, 2018
Published online: Jul 19, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 19, 2018
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