FIRE DESIGN OF STEEL MEMBERS - Civil and Natural Resources ...

as well with the experimental data. Results were compared for beams and columns
between the results found from THELMA and the experimental data.
Bennetts, Proe and Thomas wrote a series of articles in 1986 on the calculation of the
response of structural elements, on the thermal response, mechanical response and
overall behaviour. The report (Bennett et al, 1986) on the thermal response includes
an introduction giving background to the regulations of the existing codes at the time
of when written. It also has a procedure for calculating the overall behaviour of a
structural element in a fire based on thermal response of the element and strength of
the element as a function of temperature. Methods for calculating the thermal response
for protected and unprotected steel members are given. Various methods for
calculating behaviour of protected members are given including methods with or
without moisture and the CTICM method. These methods use simplified heat flow
theory to predict the behaviour of steel members Regression analyses were also
performed in the report to provide estimates and confidence limits of the temperature
of the steel member. An application of the test results is included also, which
compares theoretical calculations with experimental results.
Proe et al 1 , (1986) is the second article of the series and outlines the mechanical
response of steel including a brief overview of the purpose of the fire test – for
calculating the thermal response of an element under fire loading and the strength of
the element as a function of temperature of the element. The relationship between the
tests to ECCS recommendations is commented on. A review of plastic analysis
behaviour of steel members is included and methods to apply the basic principles to
simply supported beams, built in beams, multi-span beams and struts. Plastic analysis
under fire conditions is looked at with an outline of the behaviour of steel under
elevated temperatures. Variation of steel strength with temperature is covered, when
the member is treated as an isothermal member, and when variation within a member
either along the member or within the depth of the member is considered. Mechanical
properties of steel in a member such as expansion, modulus of elasticity and strength
of struts is looked at. An analysis of the fire test behaviour includes correlations
between the theoretical calculations and experimental data for beams with uniform
temperature distribution, beams with a concrete slab and struts at uniform
temperature.This paper uses methods to determine the load capacities of isolated
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