Behaviour of lockbolts in slip‐resistant connections for steel structures

Ebert, Andreas D.; Dörre, Maik; Glienke, Ralf

doi:10.1002/stco.201710043

Cited by 19 publications

(10 citation statements)

References 6 publications

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“…7, are published in [27], [28], [29]. As a conclusion of [27], [28], [29], the coefficient of variation for the initial preload F p,C,ini is still lower, with about V X = 5 % for lockbolts of different sizes, dimensions and surface preparations of the specimens.…”

Section: Application Of Preload With Lockboltsmentioning

confidence: 98%

Joints with lockbolts in steel structures – Part 1: Lockbolt technology

et al. 2020

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Many mechanical joints in steel structures use conventional bolts. Nevertheless, this proven jointing technology has some significant disadvantages. These basically include the high levels of scatter during application of the assembly preload using the torque-controlled tightening process, the risk of loosening during cyclic loads due to transverse displacement of the components and the low fatigue resistance under axial loading. Lockbolt technology was invented as long ago as the 1930s and mainly used for the aviation and space industry because of its evident advantages. This jointing technology has been constantly further developed in response to the most diverse demands from sectors such as aviation, commercial vehicles, rail vehicles, agricultural machinery, defence technology and steel structures. The application of lockbolt technology, which is primarily used in mechanical engineering, was in most cases based on individual studies, since no consistent rules and guidelines were available for the design and execution of lockbolt connections in steel structures. Within the scope of several public research projects funded by the AiF (German Federation of Industrial Research Associations) and conducted by the iGF (Industrial Collective Research) organization as well as through approval investigations, the Fraunhofer Institute for Large Structures in Production Engineering (IGP) has successively developed the necessary design rules according to the EN 1993 standard (Eurocode 3) for use in structural connections. This paper presents connections with lockbolts in steel structures. Following an introduction to lockbolt technology and the assembly preload of lockbolts, the securing effect and corrosion protection of lockbolts are presented.

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Section: Application Of Preload With Lockboltsmentioning

confidence: 98%

Joints with lockbolts in steel structures – Part 1: Lockbolt technology

et al. 2020

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“…These tests consist of slip load, creep and extended creep tests. The test procedure was optimized in the EU project SIROCO and the long-term behaviour of slip-resistant connections has been investigated and published in [25,26,27]. Fig.…”

Section: Slip-resistant Connectionsmentioning

confidence: 99%

“…The dimensions of the specimens were exactly in accordance with ARTICLE assessment of long-term behaviour, are presented in [29,30,31,25]. The design of slip resistance taking into account preload losses is described in [32,26,33].…”

Section: Slip-resistant Connectionsmentioning

confidence: 99%

Joints with lockbolts in steel structures – Part 2: Design and execution

et al. 2020

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Many mechanical joints in steel structures use conventional bolts. Nevertheless, this proven joining technology has some significant disadvantages. These basically include the high levels of scatter during application of the assembly preload using the torque‐controlled tightening process, the risk of loosening during cyclic loads due to transverse displacement of the components and the low fatigue resistance under axial loading. Lockbolt technology was invented as long ago as the 1930s and mainly used for the aviation and space industry because of its evident advantages. This joining technology has been constantly further developed in response to the most diverse demands from sectors such as aviation, commercial vehicles, rail vehicles, agricultural machinery, defence technology and steel structures. The application of lockbolt technology, which is primarily used in mechanical engineering, was in most cases based on individual studies, since no consistent rules and guidelines were available for the design and execution of lockbolt connections in steel structures. Within the scope of several public research projects funded by the AiF (German Federation of Industrial Research Associations) and conducted by the iGF (Industrial Collective Research) organization as well as through approval investigations, the Fraunhofer Institute for Large Structures in Production Engineering (IGP) has successively developed the necessary design rules according to the EN 1993 standard (Eurocode 3) for use in structural connections. These design rules will be presented within the context of this article in order to make the benefits of this joining technology available to other users. In addition, insights into the use of technical approvals will be presented together with some current applications.

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“…Die Unterlast F u berechnet sich über das Lastverhältnis R. Geprüft wurden Einstufenkollektive im Zugbereich mit R = 0,1 und unter rein wechselnder Last mit R = -1. [20].…”

Section: Versuchsdurchführungunclassified

Vorspannkraftverluste geschraubter Verbindungen infolge beschichteter Kontaktflächen

et al. 2018

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Die in Bauwerken mit zyklischen oder nicht vorwiegend ruhenden Beanspruchungen eingesetzten Schraubverbindungen werden gezielt vorgespannt, um die Beanspruchbarkeit und Steifigkeit der Anschlüsse zu erhöhen. Die bereits nach der Montage in den geschraubten Verbindungen auftretenden Vorspannkraftverluste sind idealerweise bei der Bemessung und Ausführung der Konstruktion realistisch abzuschätzen und implizit zu berücksichtigen, damit die rechnerisch angesetzte Vorspannkraft während der Nutzungsdauer des Bauwerks in der Verbindung verbleibt. Im Rahmen des IGF‐Forschungsvorhabens 18711 BG „Vorspannkraftverluste ermüdungsbeanspruchter vorgespannter Schraubverbindungen” wurden hierzu systematische Untersuchungen an vorgespannten geschraubten Verbindungen der Kategorien B/C und E nach DIN EN 1993‐1‐8 vom Institut für Metall‐ und Leichtbau der Universität Duisburg‐Essen (IML) in Kooperation mit der Fraunhofer‐Einrichtung für Großstrukturen in der Produktionstechnik in Rostock (IGP) durchgeführt. Hierbei wurden Vorspannkraftverluste aus Setzen und infolge Ermüdungsbeanspruchung experimentell ermittelt und auf die geplante Lebensdauer logarithmisch extrapoliert. Die Untersuchungen erfolgten an M20‐Schraubengarnituren mit verschiedenen Verbindungsmitteln/Anziehverfahren sowie Klemmlängenverhältnissen und Oberflächenausführungen der Prüfteile.

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Behaviour of lockbolts in slip‐resistant connections for steel structures

Cited by 19 publications

References 6 publications

Joints with lockbolts in steel structures – Part 1: Lockbolt technology

Joints with lockbolts in steel structures – Part 1: Lockbolt technology

Joints with lockbolts in steel structures – Part 2: Design and execution

Vorspannkraftverluste geschraubter Verbindungen infolge beschichteter Kontaktflächen

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