Development of the Fire-Protective System (Membrane System) Using Fire - Resistant Steel for Cooperative Houses

摘要

Fire-resistant steel for building structure (FR Steel)is the one whose high-temperature intensity is improved by addingalloy elements (e.g. molybdenum) with heat-resistance enhancingability. At 600 deg C, the steel has a yield point over 2/3 of thespecification value at room temperature, which is long-termpermissible stress. On the other hand, a fire temperature reachesabout 1,000 deg C in the case of a fire in a building with a lot ofinflammables such as a house, therefore, applying FR steel to hiskind of building could not omit insulating shield, rock wool forexample. With cooperative houses as our target, we havedeveloped steel-framed construction using FR steel without fire-resistant shield and its fire-resistance designing method, whichmakes use of the thermal insulation effects of the interiormaterials (walls and ceilings).