Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Loss of preload in bolted connections due to typical coating systems for steel structures
Bolted connections can be preloaded either to ensure the structural safety or to improve the serviceability e.g. by minimizing the slip or by increasing the deformation stiffness. According to DASt-Guideline 024, target level I of preloading and target level II of preloading can be distinguished. A design of bolted connections with target level II of preloading is carried out without consideration of the actual amount of preload. However, the preloading force is directly included in the design verification for connections of target level I, so that the nominal value of preloading force should not only be reliably achieved during the tightening of a connection, but a sufficient level of preloading force considering the resulting preload losses must be ensured over the service life of the structure. A special type of connections with target level I of preloading is represented by the slip-resistant connections, which performance mainly relies not only on the level of preload, but also on the associated slip factor. The determination of the latter can currently be carried out considering the test procedure acc. to EN 1090-2, Annex G. A sufficient design and execution of low-maintenance connections depend on the knowledge of several influencing factors, such as the reliability of different tightening methods with the associated system reserves and/or the estimated loss of preload over the service life. Since an assessment of potential preload losses is only possible to a very limited extent according to the current state of the art in steel construction, a development of suitable verification methods is necessary. Furthermore, recommendations with regard to the execution of slip-resistant connections considering practical boundary conditions are desirable in order to assess their possible influence on the slip resistance. A comprehensive investigation was carried out in order to address the gap in the knowledge that currently exists for preloaded bolted connections. Herein, practically applicable solutions for a ...
Loss of preload in bolted connections due to typical coating systems for steel structures
Bolted connections can be preloaded either to ensure the structural safety or to improve the serviceability e.g. by minimizing the slip or by increasing the deformation stiffness. According to DASt-Guideline 024, target level I of preloading and target level II of preloading can be distinguished. A design of bolted connections with target level II of preloading is carried out without consideration of the actual amount of preload. However, the preloading force is directly included in the design verification for connections of target level I, so that the nominal value of preloading force should not only be reliably achieved during the tightening of a connection, but a sufficient level of preloading force considering the resulting preload losses must be ensured over the service life of the structure. A special type of connections with target level I of preloading is represented by the slip-resistant connections, which performance mainly relies not only on the level of preload, but also on the associated slip factor. The determination of the latter can currently be carried out considering the test procedure acc. to EN 1090-2, Annex G. A sufficient design and execution of low-maintenance connections depend on the knowledge of several influencing factors, such as the reliability of different tightening methods with the associated system reserves and/or the estimated loss of preload over the service life. Since an assessment of potential preload losses is only possible to a very limited extent according to the current state of the art in steel construction, a development of suitable verification methods is necessary. Furthermore, recommendations with regard to the execution of slip-resistant connections considering practical boundary conditions are desirable in order to assess their possible influence on the slip resistance. A comprehensive investigation was carried out in order to address the gap in the knowledge that currently exists for preloaded bolted connections. Herein, practically applicable solutions for a ...
Loss of preload in bolted connections due to typical coating systems for steel structures
Makevičius, Lukas (Autor:in) / Stranghöner, Natalie
25.07.2023
Hochschulschrift
Elektronische Ressource
Englisch
Loss of preload in bolted connections due to typical coating systems for steel structures
| TIBKAT | 2023
Bolted end-plate connections for steel structures
| Taylor & Francis Verlag | 1979