Journal
STRUCTURAL ENGINEERING INTERNATIONAL
Volume 31, Issue 2, Pages 200-207Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10168664.2020.1813675
Keywords
fatigue; steel bridges; welded joints; structural reliability; uncertainty
Funding
- international organization TNO
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This study applies probabilistic fatigue life prediction models to estimate the safety level of a non-load carrying cruciform joint. Results demonstrate that a 0.5 to 1 increase in the reliability index can be achieved by applying a more complex model.
This present paper concerns the application of probabilistic fatigue life prediction models based on S-N curves aiming at the estimation of the safety level for a non-load carrying cruciform joint. The safety level is expressed in terms of the reliability index as a function of the number of applied cycles. Estimating the reliability of a structural component against fatigue failure is relevant for both new and existing structures. The analysis is executed considering three models. For each of them, the input random variables are given in a probabilistic manner, based on fatigue test data from the scientific literature. The effect of the model uncertainty on the model response is quantified for both the load and the resistance side, demonstrating its relevance. Moreover, it has been shown that a 0.5 to 1 increase in the reliability index is achievable by applying the newly proposed, more complex model.
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