This diploma thesis investigates the phenomenon of lateral-torsional buckling in flexurally loaded steel beams, focusing on the factors influencing the beam's resistance to this type of instability. To demonstrate the phenomenon on a physical model, a cantilever beam model was fabricated using 3D printing technology. The model’s geometry was designed based on a review of existing literature and adapted to facilitate a clear demonstration of lateral-torsional buckling. For the 3D printing process, a flexible material, Polyflex TPU 95A-HF, was selected due to its mechanical properties, which enabled the manifestation of lateral-torsional buckling at low load levels. The analytically determined critical load was compared with the load measured experimentally on the physical model. Additionally, the thesis explores methods to prevent lateral-torsional buckling, achieved through the design of a lateral support system. This system consists of a horizontal connection between two adjacent beams, providing lateral stability and preventing loss of stability. The out-of-plane forces are transferred through the connection to the supports
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