Three-Dimensional Numerical Simulation for Lateral Distortional Buckling Behaviour of Steel-Concrete Composite Beams

Lateral Distortional Buckling (LDB) is a mode of instability in Steel-Concrete Composite (SCC) beams that yet to be fully understood by the structural engineering research and design community. This work investigated numerical methods understand LDB behavior SCC under negative moments exhibit nonlinear behavior. Focus study was develop validate 3-Dimensional finite element (FE) models which capture precisely. Detailed FE were developed using ABAQUS. For modeling concrete, damage plasticity model considered. A quad-linear curve used describe stress-stain relationship for steel beam. The rebar described bi-linear while an elastic perfectly plastic assigned headed stud shear connectors. Steel hardening simulated isotropic model. interaction between concrete slab, beam, studs appropriate interface elements combined suitable constraints. model’s accuracy validated results obtained from previous experiments found literature together with brief description done researchers ensure completeness. Validation comparing Moment-Rotation curves experimental tests, lateral displacements bottom flange along axial direction comparison failure modes test specimens. It observed maximum relative error ultimate moment capacity composite analysis tests less than 2% shows strong agreement results. Accordingly, herein proves capable accurately representing phenomenon.