Development of Advanced Analysis for Steel Frame Accounting for Lateral Torsional Buckling

In this paper, an advanced analysis of the steel frame accounting for lateral torsional buckling has been developed. This analysis can consider material and geometric nonlinearities of structural system as well as degradation of flexural strength due to lateral torsional buckling. Efficient ways of assessing steel frame behavior including nonlinear and inelastic effects are outlined. In this study, a model consisting of the unbraced length and section shape is used accounting for the lateral torsional buckling. The developed advanced analysis has been verified by comparison of the LRFD solution. The Proposed analysis can be used for daily office design of steel frames which are not braced against out of plane motion with an appropriate space. The proposed method eliminates the separate member capacity check after analysis.