Tension‐shear interaction of high‐strength bolts during and after fire

Connections in steel structures play an essential role in the structural stability of the entire construction. This is also true in the event of a fire. The difficulty in designing connections for fire lies in the fact that not only material properties, but also loads applied to the connections chan...

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Bibliographic Details
Published in:Steel construction : design and research 2019-05, Vol.12 (2), p.124-134
Main Authors: Lange, Jörg, Kawohl, Anne
Format: Article
Language:English
Subjects:
Brandschutz
Combined loading
connections
Eurocode
Fasteners
fire
Fire protection
High strength bolts
interaction tests
Material properties
Shear strength
Steel structures
Structural stability
Structural steels
Temperature dependence
Tests
Verbindungs‐ und Befestigungsmittel
Versuche
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Summary:Connections in steel structures play an essential role in the structural stability of the entire construction. This is also true in the event of a fire. The difficulty in designing connections for fire lies in the fact that not only material properties, but also loads applied to the connections change depending on temperature. In addition, the temperature‐dependent decrease in the tensile strength of high‐strength bolts does not coincide with the decrease in shear strength. So far, the influence of combined tension and shear loading on high‐strength bolts has not been studied in detail. This project included carrying out interaction tests on high‐strength bolts of property class 10.9 (fu = 1000 N/mm2). Post‐fire performance was examined in addition to observing the loadbearing behaviour during fire. The examinations were completed with additional material tests. The results were compared with earlier research on the temperature‐dependent loadbearing capacity of high‐strength bolts during and after temperature loading as well as on the loadbearing behaviour of bolts in steel structures under combined tension and shear loads. This investigation contributes to a better understanding of the loadbearing capacity of high‐strength bolts under combined loading during and after a fire.
ISSN:1867-0520
1867-0539
DOI:10.1002/stco.201900008