Fatigue Design of Steel and Composite Structures

Nussbaumer, Alain; Borges, Luís; Davaine, Laurence

doi:10.1002/9783433601181

Cited by 45 publications

(30 citation statements)

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“…N0 = 0.5x106 lorries per year and per slow lane; − Q0 = 480 kN (for FLM3); − Nobs = 2.0x106 lorries per year and per slow lane; , i.e. the mean weight of the heavy traffic from FLM4 for long distance traffic[11]. 0 for the design live of the bridge =100 years.…”

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confidence: 99%

16.04: High strength steel (HSS) S690 in highway bridges: Comparative design

2017

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The use of High Strength Steel (HSS) S690 in highway bridges decks is not yet widespread. A research program investigated the optimal use of HSS S690 within bridges was conducted. A comparative design is presented for a 21.5 m wide highway bridge, with a typical 80 m long span and a composite steel‐concrete twin plate girder deck. Two designs are compared, using the Eurocodes: Design (A) adopted standard S355 NL steel grade whereas Design (B) uses HSS S690 QL or QL1 on the main girders. Comparison between the two designs shows that using S690 enables reductions of 25% on the steel weight and about 65% on full penetration welding volume, compared to design with S355. The deck can be slender using HSS and have thinner plates, but it is more susceptible to local buckling phenomena. Brittle fracture is slightly less dimensioning using HSS, but girders are likely to be much more prone to fatigue, which proves to be the main issue of the design together with the local buckling phenomena. The critical fatigue welded joints are analysed according to EN 1993–1‐9. For plate girders with transverse stiffeners, fatigue presents a major design constraint, namely on span sections, due to allowable plate stresses range near the welded joints. Standard fatigue load model FLM3 with the damage equivalent factor concept is used for fatigue design of several plate girder details. Fatigue resistance of the welded joint between the transverse stiffeners and the bottom tension flange proved to be the most relevant aspect of the design of the composite steel‐concrete twin plate girder deck designed for HSS S690.

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16.04: High strength steel (HSS) S690 in highway bridges: Comparative design

2017

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“…Moreover, almost all cracks initiate from the rounded welding region between the diaphragm and the closed rib. We do not find a similar structure detail in the design codes for steel structures [21][22][23][24]. Therefore, Equation (2) could provide a reference for the fatigue design of this detailed structure.…”

Section: Fatigue Tests and Resultsmentioning

confidence: 99%

Fatigue Property and Improvement of a Rounded Welding Region between the Diaphragm Plate and Closed Rib of an Orthotropic Steel Bridge Deck

Zhang

Lü

2020

Metals

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By means of finite element modeling (FEM) and fatigue experiments, we study the fatigue performance of the rounded welding region between the diaphragm plate and closed rib of orthotropic steel bridge deck in this work. A local sub-model of the rounded welding region from the orthotropic steel bridge deck was developed to analyze the stress distributions. Based on the analysis results we designed the fatigue specimen for the fatigue test of this detailed structure. The fatigue experimental results revealed that the crack initiates from the weld toe of the rounded welding region and the stress concentration at the rounded welding region is the main mechanism of fatigue crack initiation. In addition, we propose three improvements to reduce the stress concentration of the rounded welding region, and the local structure optimization scheme of the diaphragm–rib weld can effectively improve the fatigue resistance of the detailed weld structure.

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“…In the case of fatigue strength anchorages are designed to last longer than the cable itself. In order to conduct the fatigue checks in those untypical elements the hot-spot method was applied [15].…”

Section: Cable-stays Anchoragementioning

confidence: 99%

Computational simulations of the cable-stayed bridge over the Vistula River in Krakow

Topolewicz

Topolewicz²

2018

MATEC Web Conf.

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This article presents the execution method of a cable stayed bridge over the Vistula River in Krakow together with FEM-based computational simulations carried out during the design process. The performed calculations concern the global system in its final stage and in the construction stages as well as local analysis of construction details. The obtained results made it possible to work out efficient solutions that contribute to a significant reduction of the project cost and execution time shortening.

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Fatigue Design of Steel and Composite Structures

Cited by 45 publications

References 0 publications

16.04: High strength steel (HSS) S690 in highway bridges: Comparative design

16.04: High strength steel (HSS) S690 in highway bridges: Comparative design

Fatigue Property and Improvement of a Rounded Welding Region between the Diaphragm Plate and Closed Rib of an Orthotropic Steel Bridge Deck

Computational simulations of the cable-stayed bridge over the Vistula River in Krakow

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