This master's thesis addresses the mass optimization of the main girder of an overhead travelling crane. Reducing the mass of the girder contributes to increased performance, lower energy consumption, reduced material usage, a smaller carbon footprint, and lower overall cost. These improvements are achieved while adhering to the defined constraints, which
include strength, deformation, local buckling, and global buckling criteria. These constraints are being explained in detail in the first part of the thesis, with corresponding equations. Next, optimization program, which is written in Microsoft Excel and contains all defined constraints, is represented. Optimization program is divided in several sub steps, which allows for sequential execution of multiple partial optimizations. At first, we optimize simple box section girder, which is followed by optimization of longitudinal stiffeners and finally optimization of box section girder with longitudinal stiffeners. The final part of the thesis presents intermediate and final outcome of the optimization process.
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