Bewertung und Instandsetzung von Altstahlkonstruktionen

Stroetmann, Richard; Sieber, Lars; Taras, Andreas; Anders, Jürgen; Kuscher, Gerd

doi:10.1002/9783433607633.ch11

Cited by 3 publications

(10 citation statements)

References 29 publications

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“…Based on the analysed material toughness of old mild steels a procedure for the assessment of brittle fracture of riveted structural elements was derived for typical structural details within a fracture mechanical safety analysis in [20,26]. Related to the width of the hardened zone from punched holes, a crack with a straight front and a depth of 3 mm may be assumed at the most stressed hole edges of predominantly statically loaded structures.…”

Section: Discussionmentioning

confidence: 99%

“…Equations for stress intensity factor approaches from the relevant literature can be used to determine the toughness requirements for components with rivet holes. Based on fracture mechanical finiteelement-calculations a modification of these approaches was carried out for the joints of angle profiles in [20,26]. The assessment procedure was transferred to a semiprobabilistic verification concept by using statistic methods to consider the variation of strength and toughness values of old mild steels after verification by component tests.…”

Section: Discussionmentioning

confidence: 99%

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Toughness of old mild steels

Stroetmann

Sieber

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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For the rehabilitation of steel structures from the 19th and the early 20th century the brittle fracture behaviour is essential for the structural safety. The methods of the assessment used in EN 1993-1-10 were predominantly developed for welded structures made of current steel grades with more or less high toughness. The check by limitation of the plate thickness (Table 2.1 in [1]) is not suitable for old mild steel structures with riveted and bolted connections. Notch effects and residual stresses are quite different to those ones of welded structures. The material properties of old mild steels are characterised by larger scatters, particularly due to the inhomogeneous distribution of tramp elements and higher contents of non-metallic inclusions. In this paper, experimental and analytical studies of the brittle fracture behaviour of mild steels as well as aging effects of structural elements with holes for riveted and bolted connections are presented (see also [2][3][4], [20]).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Toughness of old mild steels

Stroetmann

Sieber

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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“…For puddle steel, the dataset was extended later with material test results from the Federal Institute for Material Testing (BAM) in Germany [13]. In this dataset, the mean value of the tensile strength turns out to be somewhat lower [12], with a larger standard deviation at the same time (E = 361 MPa, σ = 31 MPa). Those more conservative statistical parameters were used to calibrate the partial safety factors for puddle steel.…”

Section: Methodology For Partial Safety Factor Calibrationmentioning

confidence: 99%

Ultimate and fatigue limit states of existing steel railway bridges – LRFD with historical steel products and connection types

Kroyer

Taras

2023

Steel Construction

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The assessment of the load‐bearing capacity and fatigue strength of existing railway bridges has been playing an increasingly important role in the infrastructure management of railway operators for several years now. Currently, many bridge structures have been in operation longer than it was foreseen during their planning and construction. In addition, the axle loads on many lines, as well as the demands on the reliability of the verification results, have steadily increased. As the material properties and construction techniques in existing structures differ to some extent from nowadays structures, e.g., riveting instead of welding, it is important to provide engineers and operators with recommendations for the assessment of existing steel bridges. This article summarises the studies conducted as part of a research project initiated by Deutsche Bahn Netz AG for possible updates to DB RiL 805, which is used for the verification of railway bridges in the Deutsche Bahn (DB) network. The studies concerned the transition of verification concepts against static and fatigue loads used in the past to limit state verifications with partial safety factors in accordance with the Eurocodes. While initially related to an upgrade of a specific operator's design recommendation, the findings in this article are of more general nature and could form the basis for similar developments of recommendations for the assessment of existing, riveted structures independently throughout Europe.

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“…7 shows a good fit of the experimental results and the corresponding numerical model. The characterisation of the tested materials as mild steels is based on their chemical composition in Table 2 (see [19]- [21]). Puddle iron typically has a significantly higher phosphorus content than the steels investigated.…”

Section: Finite Element Modelling Of the Test Set Upmentioning

confidence: 99%

“…As their replacement would be very expensive, operators often consider their continued use. For this reason, riveted structures have been the subject of extensive research throughout Europe in recent years [1], [5], [19]. Numerous riveted structures that are relevant with regard to fatigue are railway bridges.…”

Section: Introductionmentioning

confidence: 99%

Influence of rivet clamping stress on fatigue crack growth behaviour

2021

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Steel structures built between 1850 and 1940 are mostly made of mild steel. Riveting was the dominating joining technique. Fatigue failure respectively fatigue safety is of major concern if these structures are cyclic loaded such as bridges and hydraulic steel structures. Considering the period of operation of almost hundred years, the determination of the remaining fatigue life is the main aim of the assessment of these structures. The clamping force of the rivets significantly influences the crack propagation. Clamping stress is caused by the shrinkage of hot driven rivets while cooling down. The clamping force and the corresponding friction at the contact surfaces reduces notch stress at the rivet hole and thus also the crack driving force. In this paper, experiments for determining the rivet prestressing as well as the friction at the contact surfaces of riveted joints are presented. For typical design details numerical models are generated to determine notch stresses for uncracked components and stress intensity factors for cracked components. Regarding to crack growth rates, only few data have been published for old mild steels so far. Thus, the research program also includes experimental investigation of crack growth parameters.

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Bewertung und Instandsetzung von Altstahlkonstruktionen

Cited by 3 publications

References 29 publications

Toughness of old mild steels

Toughness of old mild steels

Ultimate and fatigue limit states of existing steel railway bridges – LRFD with historical steel products and connection types

Influence of rivet clamping stress on fatigue crack growth behaviour

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