Abstract
The strength and stability of steel columns that have been subjected to combined axial and reversed lateral loading has been investigated analytically and computationally. An analytical model based on the Rayleigh-Ritz technique is proposed and run in parallel with detailed finite element models that are validated using available experimental results. Analytical and simulation results show that local flange damage as well as lateral torsional buckling in deep, slender sections under moderate axial loads leads to failure of the section prior to the assumed drift level for a highly ductile member. The possibility of this premature failure leading to vertical progressive collapse is investigated using detailed finite element 2D and 3D frame models.