Partial factors for fatigue loads in the Eurocode system for road bridge design

S.B. Hashemi, J. Maljaars, H.H. Snijder

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In the Eurocode system, for fatigue design of bridges, the recommended partial factor for fatigue traffic loads is set to 1. In this paper, the adequacy of this approach is investigated by performing a reliability analysis on two types of welded joint in a main girder of a steel motorway bridge. For this purpose, a weigh in motion measurement dataset belonging to a main Dutch motorway has been compared with the fatigue load model 4 of Eurocode EN 1991-2 with respect to the stress spectrum and the fatigue damage of two structural steel de-tails. Several structural schemes have been considered to study the effect of the shape and length of the influ-ence line. The distributions of the stochastic variables such as dynamic amplification, accuracy of the structur-al model, and future traffic trends have been estimated or taken from literature. Partial factors for fatigue loads have then been calibrated in such a way that the target reliability is obtained. The influence of each sto-chastic variable on partial factors has been studied by derivation of the sensitivity factors. The results show that a considerably higher fatigue partial factor is required for fatigue loads on road bridges than the value of 1 currently recommended in EN 1991-2.
Original languageEnglish
Title of host publicationSafety and Reliability - Safe Societies in a Changing World
Subtitle of host publicationProceedings of ESREL 2018
EditorsCoen van Gulijk, Stein Haugen, Anne Barros, Jan Erik Vinnem, Trond Kongsvik
Place of PublicationLondon
PublisherTaylor and Francis Ltd.
Number of pages7
ISBN (Print)978-0-8153-8682-7
Publication statusPublished - 15 Jun 2018
Event2018 European Safety and Reliability Conference (ESREL 2018) - Trondheim, Norway
Duration: 17 Jun 201821 Jun 2018
Conference number: 28


Conference2018 European Safety and Reliability Conference (ESREL 2018)
Abbreviated titleESREL 2018
Internet address


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