Contribution to fire resistance analysis of statically indeterminate structures

Structural fire resistance, as integral part of structural design, is determined by testing or by calculations. This paper is focused on statically indeterminate structures where thermal expansion is restrained and significant internal forces occur in the structure leading to possible plasticization and subsequent redistribution of internal forces. In this paper different approaches of fire resistance testing are described, together with brief description of two experiments focussed on verification of behaviour of a statically indeterminate steel frame exposed to high temperature which were carried out at VŠB-TU Ostrava. The paper is complemented with calculation of steel and concrete simple frame structure exposed to elevated temperature.