Fonseca, E.M.M.Oliveira, C.A.M de2010-02-192010-02-1920012001Fonseca, E.M.M.; Oliveira, C.A.M de (2001). Numerical modelling of internal voids in fire exposed structures. In 7th Interamerican Congress on Computers Applied to the Process Industry. Campos do Jordão.http://hdl.handle.net/10198/2055The study of steel structures at elevated temperatures needs the characterisation of the thermal action and the material thermal properties variation with temperature as well as the thermal conduction problem solution in a domain with well know boundary conditions. Structures may have internal voids (figure 1) filled with air (hollow columns, profile sections thermally insulated, steel pipes,…). In the presence of internal voids, the internal air temperature will be determined with some simplified formulas deduced from heat transfer equationsengInternal voidTemperatureFinite elementsEurocodesHeat transferFire with standard temperature-time curve ISO 834conference paper2010-02-01