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Reliability-based fatigue assessment of steel bridges using LEFM: A sensitivity analysis
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-2833-4585
Chalmers University of Technology.
2016 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 93, no 1, 82-91 p.Article in journal (Refereed) Published
Abstract [en]

The lack of an established safety format prohibits a widespread use of linear elastic fracture mechanics (LEFM) for the fatigue assessment of steel bridges. The aim of this study is to facilitate a future development of a deterministic design approach. A probabilistic sensitivity analysis has been performed to study the influence of different modeling options on the resulting time variant reliability. The analyses have been performed by the first order reliability method (FORM) together with a model correction factor. The result shows the importance of modeling the crack shape in an adequate manor and, the importance of the material parameters. Other parameters as the load sequence and the option between a linear and a bi-linear crack growth law are less important. A calculation of the omission sensitivity factors shows that the uncertainties of the material parameters in the crack growth law have the most decisive influence and, thereafter, the uncertainty of the stress intensity factor.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 93, no 1, 82-91 p.
Keyword [en]
Fatigue; Bridges; Reliability
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-191476DOI: 10.1016/j.ijfatigue.2016.08.011ScopusID: 2-s2.0-84983428790OAI: diva2:956640

QC 20160912

Available from: 2016-08-30 Created: 2016-08-30 Last updated: 2016-09-12Bibliographically approved

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