The thesis deals with the design, fabrication, and testing of a 3D-printed model of a twostorey moment-resisting frame for demonstrating structural instability. The aim of the study was to develop a model that enables a visual demonstration of the instability of a planar moment-resisting frame and a comparison of the results of physical testing with those obtained from numerical analysis. The structure was analysed using SCIA Engineer software, where linear stability analyses of both 2D and 3D models were performed. Based on the 3D analysis, the critical load of the structure was determined to be 22.12 N, corresponding to a mass of 2254.84 g. The structural model was fabricated using 3D printing technology and subsequently tested under gradually increasing loads. Two structural models were tested, and the load at which instability occurred was determined for each model. In the first model, instability occurred at a total applied mass of 2438.66 g, while in the second model it occurred at 2258.16 g. The results of the physical tests were compared with those obtained from the numerical analysis. The critical loads at which instability occurred were found to be close to the value determined numerically. The 3D-printed model proved to be suitable for demonstrating the instability of a moment-resisting frame and will serve as a teaching aid for illustrating the investigated phenomenon.
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