| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel structure without fireproofing coating, restraining forced deformation to a column, and capable of finally restraining a column member angle to 1/50 or less, by reducing extension quantity of a beam in a fire, by providing a steel frame structure constituting column having high temperature strength (and high temperature time rigidity) of 600 to 800°C, in a steel frame structure subjected to the fire. SOLUTION: In this steel structure without fireproofing coating, the steel structure constituting column is formed of a novel steel material superior in the high temperature strength, on which a yield strength reduction ratio (p) (high temperature yield strength/ ordinary temperature yield strength) of making high temperature time yield strength dimensionless by ordinary temperature time yield strength, satisfies p≥-0.0029 x T + 2.48, in a range of the steel material temperature T of 600 to 800°C; and the beam (including a composition beam) joined to this column is formed of a steel material always inferior in the high temperature strength to a column forming steel material. COPYRIGHT: (C)2005,JPO&NCIPI
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