This paper investigates
the behavior of steel frames under progressive collapse using the finite
element method. Non-linear
finite element models have been developed and verified against existing data
reported in the literature as well as against tests conducted by the authors.
The nonlinear material properties of steel and nonlinear geometry were considered in the finite element
models. The validated models were used to perform extensive parametric studies
investigating different parameters affecting the behavior of steel frames under progressive collapse. The investigated
parameters are comprised of different geometries, different number of stories and different dynamic
conditions. The force redistribution and failure modes were evaluated from the
finite element analyses, with detailed discussions presented.