Abstract
Fatigue failure has always been a primary issue for the key structural elements in bridges. Therefore, reliable design criteria against this failure mode are essential in bridge design codes. Common design methods involve passing a code truck model over a bridge structural representation and determining the stress range caused by the truck model for an element of interest. The fatigue life of the element can then be determined based on the recorded stress range. Bridge structural components with short influence lines (e.g., elements spanning transversally) are mainly affected by the individual axle loads of the passing trucks rather than their gross weights. The Canadian bridge design code, however, suggests the same fatigue correction factor for these elements as the ones used for structural elements with long influence lines, which are mainly affected by the gross weight of each passing truck. With this in mind, this study aims to examine the validity of the Canadian bridge design code criteria for elements with very short influence lines. For this purpose, two truck axle weights and spacing databases recorded in the province of Ontario were employed, along with a previously developed simulation-based approach.
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Acknowledgements
The idea for this paper of a focused calibration study on short spans came from discussions with G. Grondin at AECOM. M. Haalstra and A. Au at the Ministry of Transportation of Ontario (MTO) are thanked for their insights and providing access to the MTO 2012 survey data used in this study.
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© 2022 Canadian Society for Civil Engineering
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Chehrazi, A., Chien, M.Y.X., Walbridge, S. (2022). Assessment of Fatigue Design Provisions for Bridge Elements with Very Short Influence Lines. In: Walbridge, S., et al. Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021. CSCE 2021. Lecture Notes in Civil Engineering, vol 244. Springer, Singapore. https://doi.org/10.1007/978-981-19-0656-5_13
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DOI: https://doi.org/10.1007/978-981-19-0656-5_13
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