Failure Mechanisms Governing Fatigue Strength of Steel–SFRC Composite Bridge Deck with U-Ribs
Publication: Journal of Bridge Engineering
Volume 26, Issue 4
Abstract
A composite bridge deck system with steel fiber-reinforced concrete (SFRC) is an effective solution to the fatigue cracking problem of steel orthotropic decks. The governing fatigue failure modes were investigated by experiment and numerical simulation in determining the fatigue failure criteria and fatigue strength of steel–SFRC composite deck. Wheel running tests of a large-scale composite orthotropic deck were referred to obtain the fatigue stress and observe the failure mode sequence. A three-dimensional numerical model was then established and verified for the composite deck to attain the unfavorable fatigue stress range for each fatigue criterion under varying variables regarding SFRC overlay, steel deck, and headed studs. The parametric studies showed that the SFRC overlay cracking primarily governs the fatigue strength, and the thickness and flexural strength of SFRC overlay are crucial parameters. The SFRC with high flexural strength of at least 10 MPa is recommended to apply in the thin overlay with less than 100 mm thickness, and the common SFRC can be used with the overlay thickness of at least 120 mm for the orthotropic steel deck configuration in the common range of the design parameters.
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Acknowledgments
The authors would like to acknowledge the financial support by Sichuan Science and Technology Program (No. 2019YJ0223) and the National Natural Science Foundation of China (No. 51208430).
The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.
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Published In
Journal of Bridge Engineering
Volume 26 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 2, 2020
Accepted: Oct 22, 2020
Published online: Jan 28, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 28, 2021
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