Computational fatigue durability of butt welds with cracks  in the flanges of the solid-web girder of the railway bridge

Wichtowski, B.

doi:10.26628/wtr.v91i5.1003

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…It is assumed that the basic factor describing the properties of a material is the changes in internal material structure resulting from the structural degradation processes described among other things in [3,[9][10][11]. This is mainly concerned with the decreasing value of the impact strength, sometimes even by several times.…”

Section: Fatigue-induced Structural Changes In Steelsmentioning

confidence: 99%

Quality and Fatigue Assessment of Welded Railway Bridge Components by Testing

Hołowaty¹,

Wichtowski²

2022

Engineering Principles - Welding and Residual Stresses

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During a decades-long program from 1953 to 1990, the quality of welded joints in railway bridges in Poland was assessed and quantified. It was discovered that many welded joints have technological cracks, and their quality is poor, especially in old constructions. Nearly, 200 bridges were tested using X-ray examination. The number of joints tested was over 15,000; cracks were discovered in 400 welded joints in the 34 bridges tested. To solve the problem, repeated examinations on welded joints with imperfections were undertaken and laboratory fatigue tests were performed. The tests and numerical analysis allowed fatigue behavior and tensile stresses in welded butt splices with cover plates to be recognized and excluded such a structural solution in bridges. The existing discontinuities and imperfections in welded joints following many years in service show no growths or forming of new cracks, as the applied stresses are below the threshold fatigue strength. As a result of decades of service, steel bridges undergo functional aging, and their structural steels undergo structural aging. There is a need to both harmonize differentiated procedures and create national recommendations to assess their safe endurance. Therefore, of use may be the findings presented in the chapter.

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Section: Fatigue-induced Structural Changes In Steelsmentioning

confidence: 99%

Quality and Fatigue Assessment of Welded Railway Bridge Components by Testing

Hołowaty¹,

Wichtowski²

2022

Engineering Principles - Welding and Residual Stresses

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“…8), the values will be lower. Such an analysis was carried out in [18], [19]. It may be estimated that this spectrum allows the bridge lifetime to be five times longer.…”

Section: Stresses In Welds With Cracksmentioning

confidence: 99%

Analysis of Technological Cracks in Welded Joints of Railway Bridges

Wichtowski¹,

Hołowaty²

2021

ce papers

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Whilst verifying the quality of welded joints in railway bridges in Poland, it was found that many of them contained cracks of technological, fracture and fatigue origin. This problem is associated with early welded bridge structures, in which many technological imperfections were discovered. General data for x‐ray testing on approximately 200 bridges in service are given. The tests were carried out over the period 1967–1990. The number of joints tested was 15 875 and the number of cracks discovered in the joints was 437 in the 34 bridges tested. Repeated tests on the joints containing cracks in time intervals of 5–8 years neither demonstrated further growth in the cracks nor the formation of new cracks. All the cracks discovered were formed during welding operations where there was no service loading. An analysis of the stress levels necessary for the development of crack growth was carried out via fatigue laboratory tests on three butt splice models which were similar to the joints in the bridges tested. Concurrently, the probable stress level near to the cracks was determined analytically. The calculated and measured stresses under service loadings did not exceed empirically assessed weld endurance limits for these joints and confirmed no crack growth. Hot cracks and other welding imperfections in welded joints in structures are permissible if there is neither growth in service nor resistance or rigidity loss of the structure.

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Computational fatigue durability of butt welds with cracks in the flanges of the solid-web girder of the railway bridge

Cited by 2 publications

References 3 publications

Quality and Fatigue Assessment of Welded Railway Bridge Components by Testing

Quality and Fatigue Assessment of Welded Railway Bridge Components by Testing

Analysis of Technological Cracks in Welded Joints of Railway Bridges

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