Procedures are given to calculate the loadbearing capacity of reinforced concrete beams and columns, with and without rendering, whilst exposed to fire. The temperature within the building is calculated from a knowledge of its dimensions, and the mass and calorific value of the combustible material. A procedure is given to calculate the temperature distributions within the concrete structure as a function of time, and a constitutive equation to determine its strength as a function of temperature. Further equations are provided to calculate the stress-strain relationship of steel at temperatures up to 700 C. These relationships enable the calculation of loadbearing capacity as functions of time and temperature. 9 refs.