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Walter, United States

Jimenez G.A.,Walter P. Moore Ltd
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2013

Solutions for the inelastic lateral-torsional buckling of steel web tapered beam-columns are presented. The beam-columns are subjected to an axial force and to bending moments applied at one end of the member only or to both ends. Three different computational procedures are utilized; the first method is based on the finite difference method using a direct discretization of the differential equations of lateral-torsional buckling. The coefficients appearing in the finite difference equations are determined considering the reductions of the flexural and torsional stiffness due to yielding in the inelastic range. The effects of residual stresses are included. The resulting simultaneous equations are then set up to compute the buckling determinant which yields the critical load. The second method investigated is based on the finite element method using commercially available software ANSYS. The following parameters are studied: residual stresses, initial imperfections, elastic and inelastic analyses, and different support conditions. The results of the numerical solutions are presented and compared to the design equations in the last AISC Specification that explicitly addresses tapered members.

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