FIRE RESISTANCE DESIGN OF STEEL STRUCTURE

Djelovanje požara predstavlja nepovoljan učinak na čelične konstrukcije. Stoga je veoma bitno pri proračunu uzeti u obzir djelovanje požara da bi se spriječili ogromni ljudski te materijalni gubici koji pri tome nastaju. Svrha ovog rada bila je, uz dimenzioniranje glavnih elemenata konstrukcije za mjerodavnu kombinaciju djelovanja prema važećim normama HRN EN 1990, HRN EN 1991 i HRN EN 1993, proračunati otpornost na požar prema HRN EN 1991-1-2 i HRN EN 1993-1-2. Zahtijevana je požarna otpornost od 60 minuta za analizirane elemente. Proračunom je utvrđeno da nezaštićeni čelični elementi ne zadovoljavaju zahtijevanu otpornost na požar te je predviđena zaštita elementa oblaganjem, a za to je odabrana gips kartonska ploča. Nakon provedenog proračuna zaštićenih elemenata bilo je potrebno napraviti usporedbu dobivenih rezultata nezaštićenih čeličnih elemenata sa zaštićenima te se može zaključiti da elementi zaštićeni oblaganjem zadovoljavaju traženu otpornost na požar od 60 minuta.Fire performance has an unfavorable effect on steel structures. Therefore, it is very important to consider the effects of fire during calculations, to prevent the enormous human and material losses caused by the fire. The purpose of this work was to calculate fire resistance according to HRN EN 1991-1-2 and HRN EN 1993-1-2 in addition to sizing the main structural elements for the relevant combination of action according to the applicable standards HRN EN 1990, HRN EN 1991 and HRN EN 1993. A 60 minute fire resistance was required for the analyzed elements. The calculation found that unprotected steel elements did not satisfy the required fire resistance so provided protection for the element by lining for this purpose is a gypsum board. After conducted calculation of protected elements, it was necessary to compare the obtained results of unprotected steel elements with the protected ones, and it can be concluded that lining protected elements satisfy the required fire resistance of 60 minutes