initial stage of intumescent coating behaviour during the expansion phase. It is this the different thermal conductivity-temperature relationships under different heating rates that makes it important to understand how different fire conditions, different coating thicknesses and different steel section factors will affect intumescent coating behaviour, because these design parameters influence the intumescent coating heating rate. Figure 6 Effective thermal conductivity of intumescent coating under different heating rates Temperatures of Steel Sections Protected by Intumescent Coating in Fire According to Eurocode EN 1993-1-2 (CEN, 2005), the temperature of protected steel can be calculated using the following equation: (8) where . In this equation, the thermal boundary condition of the fire is ignored. It is also assumed that the temperature of the fire protection material is the average of the steel section temperature and the fire temperature. Although this is sufficiently accurate for calculating the protected steel temperature, because of the critical influence of intumescent coating temperature on its thermal conductivity, it is necessary to calculate the intumescent coating temperature more accurately. For this purpose, it is necessary to include the thermal resistance of the fire gas in the denominator of the above equation, so that: (9) where is the total heat transfer coefficient of the fire layer, calculated as: (10) where is calculated as:
initial stage of intumescent coating behaviour during the expansion phase. It is this the different thermal conductivity-temperature relationships under different heating rates that makes it important to understand how different fire conditions, different coating thicknesses and different steel section factors will affect intumescent coating behaviour, because these design parameters influence the intumescent coating heating rate. Figure 6 Effective thermal conductivity of intumescent coating under different heating rates Temperatures of Steel Sections Protected by Intumescent Coating in Fire According to Eurocode EN 1993-1-2 (CEN, 2005), the temperature of protected steel can be calculated using the following equation: (8) where . In this equation, the thermal boundary condition of the fire is ignored. It is also assumed that the temperature of the fire protection material is the average of the steel section temperature and the fire temperature. Although this is sufficiently accurate for calculating the protected steel temperature, because of the critical influence of intumescent coating temperature on its thermal conductivity, it is necessary to calculate the intumescent coating temperature more accurately. For this purpose, it is necessary to include the thermal resistance of the fire gas in the denominator of the above equation, so that: (9) where is the total heat transfer coefficient of the fire layer, calculated as: (10) where is calculated as:
with_Burak_behaviour_paper.docx