The task of this thesis is to calculate the fire resistance of a type of lamellar beams or a one-sided trapezoidal beam with a slope α=δ=6°, a two-sided symmetrical trapezoidal beam with slope α=δ=6°, a sadlle beam with a curved intrados with slopes δ=12° and β=7,5°, and a curved constant cross section beam with slope δ=β=12°. The static system of the beams is simply supported beam, and are located at a distance of 5 m apart. Dimensioning and fire resistance were performed on the same quality materials GL28h, 15m span, because this is a 15x45m object. In fact, a comparison of the fire resistance of four types of beams for the same span dimensions and the same quality of materials with an equally constant load of 0,35 kN/m2 and required variable load analysis. The HRN EN 1995-1-1 standard was used when dimensioning glued laminated beams. All beams are dimensioned to meet the limit state of bearing capacity which is between 90% and 100% and the limit of usability. The standard HRN EN 1991-1-2 and HRN EN 1995-1-2 were used to calculate the resistance of beams to the fire. Bearing capacity of the beams is determined in the minutes for 30, 60 and 90 minutes, and the maximum bearing capacity of a particular type of beams is determined. Paper is consisted of a theoretical and practical part.. In the theoretical part, we talk about the type of laminated beams and the fire resistance of wooden carriers, and the content of the practical part of the paper is mentioned above.