| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin plate lightweight shape steel excellent in fire resistance without causing a sharp decline in its proof stress even in the case of high temperature. SOLUTION: The thin plate lightweight shape steel excellent in fire resistance constituted by molding the thin plate of a fire resisting steel not more than 215.6 GPa of Young's modulus in normal temperature and at least 147 GPa of Young's modulus at 700°C to make cold working is provided. Design proof stress P of the thin plate lightweight shape steel is regulated in the formula. Where: F<SB>o</SB>= yield stress in normal temperature, F<SB>1</SB>= yield stress at 700°C, E<SB>0</SB>= Young's modulus in normal temperature, E<SB>1</SB>= Young's modulus at 700°C, b<SB>e</SB>= effective flange width of a plate element of the shape steel and t = design plate thickness. COPYRIGHT: (C)2004,JPO
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