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

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Abstract

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
EditorsStein Haugen, Anne Barros, Coen Van Gulijk, Trond Kongsvik, Jan Erik Vinnem
Place of PublicationLondon
PublisherTaylor and Francis Ltd.
ChapterStructural Reliability
Pages2339-2345
Number of pages7
Edition1st
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
https://www.ntnu.edu/esrel2018

Conference

Conference2018 European Safety and Reliability Conference (ESREL 2018)
Abbreviated titleESREL 2018
CountryNorway
CityTrondheim
Period17/06/1821/06/18
Internet address

Fingerprint

Fatigue of materials
Weigh-in-motion (WIM)
Steel bridges
Fatigue damage
Reliability analysis
Amplification
Welds
Steel

Cite this

Hashemi, S. B., Maljaars, J., & Snijder, H. H. (2018). Partial factors for fatigue loads in the Eurocode system for road bridge design. In S. Haugen, A. Barros, C. Van Gulijk, T. Kongsvik, & J. E. Vinnem (Eds.), Safety and Reliability - Safe Societies in a Changing World: Proceedings of ESREL 2018 (1st ed., pp. 2339-2345). London: Taylor and Francis Ltd..
Hashemi, S.B. ; Maljaars, J. ; Snijder, H.H. / Partial factors for fatigue loads in the Eurocode system for road bridge design. Safety and Reliability - Safe Societies in a Changing World: Proceedings of ESREL 2018. editor / Stein Haugen ; Anne Barros ; Coen Van Gulijk ; Trond Kongsvik ; Jan Erik Vinnem. 1st. ed. London : Taylor and Francis Ltd., 2018. pp. 2339-2345
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abstract = "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.",
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Hashemi, SB, Maljaars, J & Snijder, HH 2018, Partial factors for fatigue loads in the Eurocode system for road bridge design. in S Haugen, A Barros, C Van Gulijk, T Kongsvik & JE Vinnem (eds), Safety and Reliability - Safe Societies in a Changing World: Proceedings of ESREL 2018. 1st edn, Taylor and Francis Ltd., London, pp. 2339-2345, 2018 European Safety and Reliability Conference (ESREL 2018), Trondheim, Norway, 17/06/18.

Partial factors for fatigue loads in the Eurocode system for road bridge design. / Hashemi, S.B.; Maljaars, J.; Snijder, H.H.

Safety and Reliability - Safe Societies in a Changing World: Proceedings of ESREL 2018. ed. / Stein Haugen; Anne Barros; Coen Van Gulijk; Trond Kongsvik; Jan Erik Vinnem. 1st. ed. London : Taylor and Francis Ltd., 2018. p. 2339-2345.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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T1 - Partial factors for fatigue loads in the Eurocode system for road bridge design

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N2 - 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.

AB - 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.

M3 - Conference contribution

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BT - Safety and Reliability - Safe Societies in a Changing World

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Hashemi SB, Maljaars J, Snijder HH. Partial factors for fatigue loads in the Eurocode system for road bridge design. In Haugen S, Barros A, Van Gulijk C, Kongsvik T, Vinnem JE, editors, Safety and Reliability - Safe Societies in a Changing World: Proceedings of ESREL 2018. 1st ed. London: Taylor and Francis Ltd. 2018. p. 2339-2345