Lateral-Torsional Buckling of Non-Prismatic I-beams with and without Girders: Linear Analytical and Elastic FEM Approaches

Essential steel components with variable cross-sections are fabricated from welded plates, which are primarily employed for the growth of the construction industry in beams according to the stress and stiffness requirements of the structure. Lateral-torsional buckling, in which the beam experiences nonuniform twisting and buckling about its weaker axis, is one of the most common failure modes. This dissertation focuses primarily on the lateral-torsional buckle of nonprismatic I-beams. The development of differential equations for deformation analysis of the nonprismatic beam. ANSYS results and deformation equation results are compared to validate the methodology. Using ANSYS, the lateral torsional buckling of a non-prismatic I-beam section with a uniformly distributed load is analysed. In finite element analyses, the solid element approach is used to determine the lateral buckling load for various cross-sections (& beta; = 0.1 to 1.0) by analysing their behavior. In addition, a stiffener is used to prevent lateral buckling, and the results are compared to a model without stiffeners.