Question

Determine the parametric fire curve for a fire compartment in an office building according to Annex A of Eurocode 1 Part 1-2. The floors above and below the compartment are of reinforced concrete while the walls are of lightweight concrete; the walls have 8 openings.

Basic data ​ Dimensions of the fire compartment
Width =10 m, Length =12 m, Height =3.5 m
Height of opening =1.5 m, Width of opening =3 m

The floor and ceiling are made from reinforced concrete
rho=2300 kg/m3;cp​=840 J/kgK;k=1.57 W/mK

The walls are made from lightweight concrete
rho=500 kg/m3;cp​=840 J/kgK;k=0.22 W/mK

Assume further δn​ for fire fighting measure =1.0 and medium fire growth rate.

Answer 1

To determine the parametric fire curve, calculate the heat transfer through the walls, floor, and ceiling of the compartment. Use the formulas and thermal resistance values for the different components, and consider the heat transfer through the openings in the walls.

Step-by-step explanation:

The parametric fire curve for a fire compartment in an office building according to Annex A of Eurocode 1 Part 1-2 can be determined by calculating the heat transfer through the walls, floor, and ceiling of the compartment.

To calculate the heat transfer, we need to determine the thermal resistance of each component and the temperature difference across them. For the floors and ceilings (made of reinforced concrete), we can use the formula: Q = (T1 - T2) / R, where Q is the heat transfer rate, T1 is the temperature inside the compartment, T2 is the outside temperature, and R is the thermal resistance.

Similarly, for the walls (made of lightweight concrete), we can calculate the heat transfer using the same formula but with the thermal resistance of the lightweight concrete. Taking into account the openings in the walls, we also need to consider the heat transfer through the openings using the formula: Q = U × A × (T1 - T2), where U is the overall heat transfer coefficient for the openings, A is the total area of the openings, T1 is the temperature inside the compartment, and T2 is the outside temperature.