Instandsetzung und Verstärkung von Stahlbrücken mit Kategorie‐1‐Schäden

Stranghöner, Natalie; Lorenz, Christoph; Friedrich, H.

doi:10.1002/stab.201710501

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…Umfassende Informationen zur Instandsetzung, Verstärkung und Tragfähigkeitserhöhung von bestehenden Stahlbrücken sind in der Fachzeitschrift Stahlbau, Ausgabe Juli 2017 zusammengestellt. [13], [14], [15]. Darüber hinaus sei auf den Bericht "Stahlbrücken -Bestandsanalyse, Erhaltung und Erweiterung" verwiesen, der einen Überblick über den Bestand der Stahlbrücken im Bundesfernstraßennetz liefert und eine Zusammenstellung unterschiedlicher Maßnahmen enthält [16].…”

Section: Bauliche Und Betriebliche Maßnahmenunclassified

Aktuelle Herausforderungen und zukünftige Entwicklungen im Brückenbau im Bundesfernstraßennetz

Friedrich

2018

Stahlbau

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Um die Funktionalität von Verkehrswegen dauerhaft zu gewährleisten, bedarf es fortwährender Erhaltung, Anpassung und Weiterentwicklung. Bei den Bundesfernstraßen hat für diese Prozesse eine Phase mit besonderer Dynamik begonnen. Hierfür gibt es mehrere Ursachen, die letztlich zum Finanzhochlauf für die Infrastruktur der Bundesfernstraßen geführt haben. Insbesondere für den Brückenbau ergeben sich dadurch neue Herausforderungen und Chancen. Wenngleich einige Punkte Bauweisen übergreifend Gültigkeit besitzen, erfolgt die Betrachtung aus der Perspektive des Stahl-und Verbundbrückenbaus.Stichworte: Straßenbrücke; Verkehrslast; Modernisierung; Nachrechnung; Brücke, intelligent; BIM; EC Current challenges and future developments for bridge constructions in the federal highway network. In order to keep traffic routes working continuous maintenance, adaptations and developments are required. Regarding federal highways these processes have reached an extraordinary dynamic stage. There are several reasons that finally led to a significant increase of financial resources for federal highway infrastructure. Challenges and opportunities arise particularly in the field of bridge engineering. Although several points apply independent from the construction type, assessments are derived from the perspective of steel and composite bridge engineering.

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Section: Bauliche Und Betriebliche Maßnahmenunclassified

Aktuelle Herausforderungen und zukünftige Entwicklungen im Brückenbau im Bundesfernstraßennetz

Friedrich

2018

Stahlbau

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“…Local crack repair on orthotropic steel bridges often results in reappearing defects and progressing cracks after short time, especially when the traffic load is not reduced [3][4][5]. In contrast to the traditional repair methods such as repair welding or adding supporting steel plates with mechanical fasteners, the adhesive bonding of steel patches is a less invasive approach [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Using distributed fibreoptic sensing to monitor repaired structures reinforced with steel‐patches

Grefe,

Stammen,

Dilger

et al. 2023

ce papers

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Adhesively bonded steel patches present a novel approach to strengthen fatigue cracked steel bridges or similar structures. After the repair, the new weld is covered with an adhesively bonded steel patch, redistributing parts of the load and reducing the overall stress in the repaired structure. Unfortunately, this covers the weld permanently and therefore any form of direct, visual inspection is no longer possible. Hence arises the demand for a technical solution to reliably determine the condition of the repaired weld and its reinforcement. Fibre optic sensors using Rayleigh backscatter offer a spatial distributed strain measurement from which a deformation profile can be generated. This deformation profile allows to determine the load distribution between patch and structure and can be used to identify possible changes in the load distribution which can represent a change in the mechanical properties and therefore a possible defect. Having not only the information about the absolute value of the strain but also its distribution, the expected damage can be located and measured. The deformation profile also allows to separate different forms of failure for example a broken weld, adhesive failure within the patched area or sub surface migrating corrosion.

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“…Recent decades have witnessed extensive research on the repair parameters of borehole crack arrest and adhesive bonding reinforcement technology, aiming to delay crack growth by either eliminating the crack tip or enhancing the local capacity. Additionally, the evaluation of the fatigue performance of repaired structures has been conducted using these parameters [11][12][13][14]. Nevertheless, the existing body of research on rewelding repair technology remains inadequate, and the impact of rewelding residual stress on the fatigue behavior of a bridge deck remains ambiguous.…”

Section: Introductionmentioning

confidence: 99%

Rewelding Residual Stress of Fatigue Crack at U-Rib-to-Deck of an Orthotropic Steel Deck

Qian,

Song,

Zhou

et al. 2023

Buildings

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The orthotropic steel deck is a prevalent stiffening girder structure utilized in long-span cable-stayed bridges and suspension bridges. Nonetheless, the issue of fatigue cracking has persisted in in-service orthotropic steel decks, significantly impacting the longevity of bridges. This study examines the analysis of the distribution of residual stress during the rewelding process of a fatigue crack at the U-rib-to-deck-plate joint of an orthotropic steel bridge deck. Additionally, the impact of the initial welding and the stiffness of the boundary constraint on the residual stress field during rewelding is discussed. The findings indicate that the removal of the fatigue crack prior to rewelding alleviates the transverse residual stress caused by the initial welding. After undergoing the rewelding procedure, both the transverse residual stress and the longitudinal residual stress exhibited a significant stress peak. More precisely, the transverse tensile stress underwent a rise from 21 MPa to 385 MPa, while the longitudinal tensile stress experienced an increase from 345 MPa to 525 MPa. Furthermore, the range of tensile stress within the longitudinal residual distribution expanded by 88%. Moreover, the stress redistribution during the rewelding of the local fatigue crack varied depending on the constraints imposed on the steel bridge deck. Notably, the transverse residual stress increases by 40.6% when compared to the absence of constraints. The findings of this research offer valuable insights for the implementation of rewelding repair techniques on steel bridge decks, emphasizing the significance of considering the effects of residual stresses induced during the rewelding process.

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Instandsetzung und Verstärkung von Stahlbrücken mit Kategorie‐1‐Schäden

Cited by 9 publications

References 10 publications

Aktuelle Herausforderungen und zukünftige Entwicklungen im Brückenbau im Bundesfernstraßennetz

Aktuelle Herausforderungen und zukünftige Entwicklungen im Brückenbau im Bundesfernstraßennetz

Using distributed fibreoptic sensing to monitor repaired structures reinforced with steel‐patches

Rewelding Residual Stress of Fatigue Crack at U-Rib-to-Deck of an Orthotropic Steel Deck

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