Ovim diplomskim radom usporediti će se ručni proračun 2D i proračun 3D pomoću računalnog programa SCIA Engineer 18. Proračunata je višeetažna spregnuta konstrukcija poslovne namjene. U prvom dijelu diplomskog rada teorijski su obrađeni spregnuti stupovi, spregnute ploče te općenito spregnute konstrukcije, dok je drugi dio rada baziran na 2D ručni proračun te usporedbu s 3D proračunom u računalnom programu SCIA Engineer 18. Budući da je proračun spregnutih konstrukcija u računalnim programima još uvijek u razvoju SCIA Engineer 18 ponudio je adekvatan model za usporedbu sa ručnim proračunom konstrukcije. Objekt je pozicioniran u Osijeku te je proveden proračun snijega i vjetra prema normi HRN EN 1990. Tlorisne dimenzije konstrukcije su 27,0 𝑚×20,0 𝑚 dok je ukupna visina konstrukcije ℎ=18 𝑚. Spregnuta konstrukcija je proračunata kao nepoduprta konstrukcija te se proračun vrši u dvije faze. Za glavne nosače korišten je profil HEA 300, dok su za stupove korišteni profili HEB 240 koji su u spregnutoj izvedbi potpuno ubetonirani. Korištene su spregnute ploče u sustavu „Hoesch Additiv Decke“ te su u računalnom programu SCIA Engineer 18 modelirane ploče koje imaju masu približnu sustavu „Hoesch Additiv Decke“. Na kraju je provedena analiza i usporedba rezultata ovisno o načinu proračuna te su rezultati usporedbe proračuna relevantni tj. prihvatljivo je podudaranje rezultata 2D i 3D proračuna.

This thesis compares manual 2D calculation and 3D calculation with SCIA Engineer 18 computer program. A multi-storey commercial composite structure was calculated. Composite columns, composite decks and composite structures in general are theoretically elaborated in the first part of the thesis, while the second part of the thesis is based on 2D manual calculation and comparison with 3D calculation with SCIA Engineer 18 computer program. Since composite structure calculation in computer programs is still in development, SCIA Engineer 18 has offered an adequate model for comparison with manual structure calculation. The object is positioned in Osijek and wind and snow loads were calculated in accordance with HRN EN 1990 norm. Dimensions of the structure plan are 27,0 𝑚×20,0 𝑚, with the total height of the structure ℎ=18 𝑚. The composite structure was calculated as a not supported structure and the calculation was carried out in two stages. Profile HEA 300 was used for the main beams, and for the columns profiles HEB 240 were used, which are concrete encased columns in composite performance. Composite decks were used in „Hoesch Additiv Decke“ system and decks with a mass approximate to „Hoesch Additiv Decke“ system mass were modelled in SCIA Engineer 18 computer program. Finally, the analysis and comparison of the results was done, depending on the method of calculation. The results of the comparison are relevant, that is, correspondence between 2D and 3D results is acceptable.