THE EFFECT OF FIRE SPREAD ON STEEL-CONCRETE FLOOR

摘要

The paper describes the impact of fire spread on the behaviour of the steel and concrete composite floor.The spatial and temporal evolution of the gas temperature calculated in NIST code FDS,which was validated to experimental measurements, is applied to the composite floor of dimensions 9.0 m by 9.0 m.Mechanical behaviour of the composite slab highly affected by regions of high temperatures and areas with only elevated temperatures is solved in code Vulcan.To highlight the severity of spreading fire causing non-uniform temperature conditions, which after-effects differ from traditional methods, a comparison of both methods is introduced.The calculation of mechanical behaviour of the composite floor is repeated in a serious of three different thermal loading cases.Results of all cases are then compared in terms of vertical displacement and axial force in several positions of the composite floor.