In order to find out effect of smoke emission on fire temperature field of large space structures

computer simulation was performed by FDS program for fire cases of different smoke emission systems. The results show that the smoke emission can result in large difference for fire temperature field.Maximum drop of temperature could reach 50%of primary highest fire temperature.And the range of temperature reduction is closely linked with the height of building.When the height is under 12 m

the fire temperature with natural smoke emission system is below that with mechanical emission system.However

when the height is over 12 m

the fire temperature with natural smoke emission system will be close to or higher than that with mechanical emission system.