Affiliation(s)
1. Department of Civil and Environmental Engineering, The University of Alabama in Huntsville, Huntsville, AL 35805, USA
2. Department of Civil, Architectural and Environmental Engineering, Drexel University, Philadelphia, PA 19104,USA
3. Department of Civil, Environmental and Infrastructural Engineering, George Mason University, Fairfax, VA 22030, USA
ABSTRACT
The objective of this paper
is to computationally explore the structural stability and strength of
gypsum-protected CFS (cold-formed steel) beam channel sections under non-uniform elevated
temperatures when exposed to standard fire on one side of the panel and
subjected to pure bending. When
a CFS
member is subjected to fire (or thermal gradients) its material properties
change—but
this change happens around the cross-section and along the length creating a
member which is potentially non-uniform and unsymmetrical in its response even
if the apparent geometry is uniform and symmetric.Computational finite element
models were analyzed in ABAQUS to establish steady-state thermal gradients of
interest. Existing test data were utilized to develop the temperature dependence
of the stress-strain response. The time-dependent
temperature distribution on the cross-sections obtained from heat transfer
analysis was later used in the stability and collapse analyses. The stability of the models was explored to
characterize how local, distortional, and global buckling of the member evolves
under both uniform and non-uniform temperature distributions. Finally, collapse
simulations were performed to characterize the strength under pure bending and
explore directly the evolution of strength under the influence of non-uniform
temperature.
KEYWORDS
CFS, non-uniform temperature distribution, stability,
collapse moment.
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