| 摘要 |
PROBLEM TO BE SOLVED: To enhance the fireproof performance of an external wall or floor that uses thin light-gauge steel for its frame by making strongly fire-resistant a surface member which is assembled to the frame, thereby taking further advantage of the non-combustibility of the thin light-gauge steel. SOLUTION: The external wall serves as a fireproofed bearing wall having the surface member mounted on the frame consisting of jambs 1, a head and a sill 2. The frame that supports vertical load is constructed of thin light-gauge steel using galvanized steel plates with a plate thickness t (mm) of not less than 1.0 nor more than 2.3. A first external wall lining 4a made of combustible structural plywood is mounted to the jambs 1 as the surface member supporting horizontal loads such as seismic forces and wind pressures and transmitting the loads to the ground. Also, a second external wall lining 4b made of a fireproof covering such as a gypsum board is mounted to the first external wall lining 4a to construct a fireproof wall with predetermined fireproof performance. COPYRIGHT: (C)2003,JPO
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