Design of steel structures under fire

Gounder, Sangeevam (2005) Design of steel structures under fire. [USQ Project] (Unpublished)


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The Australian Steel Design Code, AS4100 provides guidance for design of steel
elements. The fire section of the code details the procedure necessary to
determine the time and temperature of a steel member to fail under fire conditions.
Researchers all over the world have conducted studies and have reported their
findings and possible design criteria’s to use in the prediction of the temperature
rise of steel when subjected to elevated temperatures.
The material properties that affect the behaviour of structural steel members
exposed to fire have been reviewed and they are the thermal, mechanical and
deformation properties of steel which change at elevated temperatures.
This report describes the design methods used for design of steel building
elements required to have a fire resistance level in accordance with the Australian
Steel Code AS4100.1998. This report also contains sample design calculations to
predict failure of simply supported unprotected beams subjected to elevated
The review of AS4100 indicates that a simple method is used for estimating
temperatures for unprotected steel elements, whilst standard fire test curves are to
be used for estimating temperatures for protected steel elements.
Structural behaviour of steel structures in fire depends upon a number of variables
such as material degradation at elevated temperature and restraint stiffness of
members surrounded by fire. High temperatures and gradients across a structural
element are the driving force behind large deflections and axial forces. In
buildings exposed to fire they all interact, thus influencing the structural

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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 01:00
Last Modified: 02 Jul 2013 22:43
Uncontrolled Keywords: AS4100; steel; thermal conductivity; fire
Fields of Research (FoR): 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering

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