CFD modelling of the braced barrel vault made from rectangular hollow sections in natural fire

In the paper the CFD modelling of the complicated braced barrel vault made from rectangular hollow sections in natural fire is presented. The barrel vault is covering a shopping arcade.  The covered area of this shopping arcade is 40m x 80m. The shopping arcade has two levels. One of the levels is underground. The model is built in full 3D. Natural fire is simulated in FDS software for different fire scenarios. Fire load densities, fire growth rate and rate of heat release are determined from EN 1-1-2: General Actions - Actions on structures exposed to fire. Heat release rate per area is determined for t² function. The analysis shows temperature of rectangular hollow sections, distribution of temperature in the shopping arcade, visibility and heat fluxes. The temperatures or heat fluxes can be transferred to the non-linear structural analysis in finite element code Abaqus