Microstructural and Mechanical Characterisation of Post-Tensioning Tendons Following Elevated Temperature Exposure

Lucie Robertson, Zusana Dudorovaa, John Gales, Esther Vega, Tim Stratford, Jane R Blackford, Luke Bisby

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Prestressing strands lose strength and become more susceptible to creep deformation when they are heated during a fire. The consequent loss in prestressing force could under certain conditions result in structural collapse, potentially outwith the heated region of the structure. This paper describes a test programme characterising the changes in microstructure of steel prestressing tendons exposed to elevated temperatures. The residual strength tests, hardness
testing, and elevated temperature mechanical test were performed to demonstrate how recovery and recrystallisation of the initially work-hardened steel produce changes in its mechanical properties at elevated temperatures. The research results of this paper are beneficial not only in the fire design of post-tensioned structures using modern prestressing steel, but also in the assessment of the tendons’ residual strength after being affected by fire.
Original languageEnglish
Title of host publicationApplications of Structural Fire Engineering (ASFE)
EditorsFrantisek Wald, Kamila Horova, T Jána, Ian Burgess, J Jirku
PublisherCTU Publishing House, Czech Technical University in Prague
Pages474-479
ISBN (Print)978-80-01-05204-4
Publication statusPublished - Mar 2013

Publication series

NameApplications of Structural Fire Engineering (ASFE)
PublisherCTU Publishing House, Czech Technical University in Prague

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