2-D Analysis of a Building Frame Under Gravity Load and Fire.
2-D Analysis of a Building Frame Under Gravity Load and
Computational and Experimental Engineering Sciences
International Conference (ICCES). ICCES'04.
Proceedings. July 26-30-2004, Maderia, Portugal, 1-6
high rise buildings; steel structures; building
collapse; fire behavior; gravity; fire load; material
A two-dimensional finite-element model is developed that
provides some insight into the behavior and collapse of
high-rise steel buildings with open web floor systems.
For one prescribed temperature distribution that
corresponds to a two-story, quarter-span fire, the
diagonals of the heated trusses buckle inelastically,
causing considerable sag in the fire floors. This
behavior puts a high tension demand on the truss
connections to the perimeter column, which remains at
moderate temperatures in this model and does not
experience buckling. Our analysis is based on
temperatures and material properties that were selected
for illustrative purposes. Therefore no claim is made as
to its applicability to any specific structure. The
objective of this paper is to present an approach to the
analysis of a tall steel building frame similar to the
analysis by Usmani et al. For the purpose of comparison
with other published work, and to use one specific
example to illustrate the analysis method, the data used
in this paper are based on infonnation from Reference 2.
The choice of a 2-D model is justified by the need to
perfonn simple but infonnative calculations covering a
wide variety of conditions. We modeled the structural
system independently of connection details. Connections
are outside the scope of the analysis presented in this