@inproceedings{3eb192ce80d44a0881f4909928d73db9,
title = "High Temperature Deformation Behaviour of Prestressing Steel: New Insights into Creep Failure",
abstract = "Concrete slabs in modern buildings increasingly contain prestressing steel running continuously across the floor plate. When this steel is unbonded and post-tensioned (UPT), localized damage can affect the integrity of the entire building. During localised fires, locally-heated UPT steel is prone to rupture due to stress/strength/time interactions that are influenced by high temperature creep. Creep should thus be considered during the fire safe design of UPT buildings. Existing creep modelling parameters for prestressing steel are dated and overestimate deformation. Using a bespoke optical strain measurement technique, high temperature tensile tests were performed to analyze creep in two {\textquoteleft}equivalent{\textquoteright} prestressing steels. The response of stressed UPT strands exposed to localised heating is modelled for validation, and compared against tests. The new creep parameters are shown to improve the ability to model all phases of high temperature creep, including tertiary creep and eventual failure.",
author = "John Gales and Luke Bisby and Tim Stratford",
year = "2012",
doi = "10.3929/ethz-a-007050197",
language = "English",
series = "Structures in Fire (SiF)",
publisher = "ETH Zurich",
pages = "659--668",
editor = "M Fontana and A Frangi and M Knobloch",
booktitle = "7th International Conference on Structures in Fire (SiF'12)",
}