| 摘要 |
PROBLEM TO BE SOLVED: To improve quality, safety and reliability of a steel structure by clarifying material properties of a bending steel sheet and to reduce its costs. SOLUTION: Mechanical properties (0.2% yield strength Yp-p1, tensile strength Ts-p1, and yield ratio YR-p1) of a material steel sheet, carbon equivalent (Ceq), working degree (t/D=plate thickness/bending diameter), spreading resistance treatment temperature (T°C) are situated as influence factors exerted on the mechanical properties (Yp-sr, Ts-sr, and YR-sr) of the steel sheet after bending and spreading resistance treatment of the sheet, and a multiple regression analysis is conducted. Whether a trial calculation result satisfies designing request performance values of a building or not is judged via a step of building an estimation formula relating to the mechanical properties (Yp-sr, Ts-sr and YR-sr) of the steel sheet after spreading resistance treatment and a step of trially calculating the mechanical properties (Yp-sr, Ts-sr and YR-sr) of the steel sheet after the bending and the spreading resistance treatment by using this formula by considering quality characteristic distribution according to a steel type at each steel material maker from the result of the multiple regression analysis, and necessity and the spreading resistance treatment temperature of the spreading resistance treatment are specified. COPYRIGHT: (C)2004,JPO
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