Fatigue reliability assessment of welded bridge details using probabilistic fracture mechanics
Paper i proceeding, 2016

The safe life method for the fatigue life prediction of steel bridges has for several cases been shown to render misleading results. To improve the accuracy, a probabilistic model based on linear elastic fracture mechanics (LEFM) is suggested. The model is used for a sensitivity analysis on the influence of different modelling options pertinent for a fatigue assessment of bridge details. The influence of material parameters and the crack growth threshold have been investigated. The analyses have been performed for a bridge detail frequently occurring in old steel bridges and a stress range spectrum based on measurements. The results show a significant difference in the estimated fatigue life depending on the modelling options. Furthermore, the omission sensitivity factors have been estimated for the probabilistic model showing the influence of the uncertainties of the variables and which of them that needs to be determined with care.

Life prediction

Linear elastic fracture mechanics (LEFM)



John Leander

Kungliga Tekniska Högskolan (KTH)

Farshid Zamiri Akhlaghi

Chalmers, Bygg- och miljöteknik, Konstruktionsteknik

Mohammad Al-Emrani

Chalmers, Bygg- och miljöteknik, Konstruktionsteknik

19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, Stockholm, Sweden, 21-23 September 2016

978-3-85748144-4 (ISBN)





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