Temperature Evaluation In Steel Fire Protected
Elements With Intumescent Coating
Author(s)
L. M. R. Mesquita, P. A. G. Piloto & M. A. P. Vaz
Abstract
Heat transfer analysis plays an important role in the temperature prediction of
insulated steel members exposed to fire conditions. Based on the results of a
previous experimental work, made in intumescent-coated protected elements, the
intumescent effective thermal conductivity temperature variation was estimated.
An analytical approach, based on the one-dimensional heat transfer parabolic
partial differential equation through the insulation, considering a
non-homogeneous (time-varying) boundary condition at fire interface and a
lumped capacitance at the insulation-steel interface, is presented. Solutions are
established with temperature independent thermal properties and then extended
to temperature dependent thermal properties. These solutions are compared with
numerical results performed by finite element method using Matlab for different
values of insulations thicknesses and steel section factors.
Keywords: fire resistance, fire protection, intumescent coatings, heat transfer,
Duhamel’s theorem, Green’s function.
1 Introduction
Fire protection costs may represent an important part of global construction
costs, being more significant in the case of steel construction, requiring
frequently the application of an insulation material (Longton et al [1]). The use
of passive protection materials is one of the measures normally adopted to
prescribe structural fire resistance. Intumescent coating represents around one
third of steel fire protection and is growing mainly due to their use in off-site
applications.
The fire resistance of an insulated steel member is determined by assessing
the loadbearing capacity of the component during fire exposure. Heat transfer
Keywords
fire resistance, fire protection, intumescent coatings, heat transfer,
Duhamel’s theorem, Green’s function.
Related Book
Other papers in this volume
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