A hybrid fire-resistance test method for steel columns

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DOIResolve DOI: http://doi.org/10.4224/20374881
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TypeTechnical Report
Series titleResearch Report, NRC Institute for Research in Construction; Issue 292
Physical description40 p.
AbstractThis paper describes a simple hybrid approach for estimating fire-resistance of steel columns within a building frame. This approach includes the effects of the structural system and thermal expansion phenomenon. In this technique, a steel column is tested in fire in a furnace while the structural system is modeled using computer software. Response of the steel column from the fire test and response of the structural system from the analysis are coupled according to the compatibility and equilibrium condition using a sub-structuring method. A real time interaction is implemented between the structural system response and the steel column response. Two analytical approaches are described in this report for evaluation of the structural system response; a simplified method and a full-structural analysis. In the first method, the entire frame is simplified into a single equivalent spring coupled with the column. The spring is an analytical model which is defined in the form of a load-displacement curve. The column specimen is then exposed to fire using a column furnace test facility and loaded according to the obtained load-displacement curve. The second method uses structural analysis software to determine the load-displacement relation. More efforts were extended to the simplified method in this study, since it is more applicable for practice. Frames with differing numbers of stories and heights were selected for the analysis. A comparison was undertaken between the results of the simplified method and that of the full-analysis approach resulting in a consistent agreement. This research report provides the theoretical concept and formulation of the simple hybrid test approach. Before application in practice, the model should be verified through a future experimental program.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number20692
NPARC number20374881
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Record identifier03981c11-62b3-4e66-84cd-bcbdeec7d90c
Record created2012-07-23
Record modified2016-10-03
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