REAL FIRE RESISTANCE CALCULATION OF BUILDING STRUCTURES

This paper presents a new concept of real fire resistance calculation of structures using computational models based on real fire load. Models are based on Eurocode EN 1991-1-2. Behaviour calculation of structural members in a fire consists of several steps as follows: selection of a fire scenario, determination of fire type, determination of design fire scenario in a growth phase, analysis of thermal distribution in the compartment and through its structural members and mechanical characteristics analysis of structural materials. On the basis of the results obtained by thermal and mechanical analysis and on the structural input data, the reduced load-bearing capacity of members can be calculated in the structural analyses. Load-bearing capacity criterion of a structural member can be expressed in one of the three domains: time, strength and temperature. When the thermal effect of fire and mechanical response of buildings in case of fire are known, it is possible to design building construction with the required resistance to fire. The new concept of fire resistance calculation enables the creation of more realistic image of the reliability of the structure in case of a real fire.