�@ Œf�ÚŽGŽ��i˜a�j�F “ú–{’n�k�HŠwƒVƒ“ƒ|ƒWƒEƒ€˜_•¶�W Vol�F 8-2Šª ”N�F 1990”N •Å�F 1467-1472•Å ’˜ŽÒ�i˜a�j�F - ƒ^ƒCƒgƒ‹�i˜a�j�F - �´˜^�i˜a�j�F
- ƒL�[ƒ��[ƒh�i˜a�j�F - Œf�ÚŽGŽ��i‰p�j�F PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒ�i‰p�j�F Tetsuro INOUE, Hitoshi KUWAMURA, Yukio FUJII ƒ^ƒCƒgƒ‹�i‰p�j�F ULTIMATE STRENGTH AND DUCTILITY OF LOW-YIELD-RATIO NIGH-STRENGTH STEEL BEAM-COLUMNS �´˜^�i‰p�j�F
It is very important for structural steel to possess an adequately low yield ratio in order to provide steel members with ductility. For this reason high-strength steel with tensile strength greater than 60 kgf/�¡ has been considered unsuitable for seismic design because of its high yield ratio. However, recent developments in steel production practice in rolling mills have realized 60 kgf/�¡-tensile-strength steel with yield ratio less than 80 %. The ultimate behavior of beams and beam-columns with H-shaped sections built from this new steel was experimentally investigated, from which empirical formula for ultimate strength and ductility were proposed in this paper. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@ˆÏˆõ‰ï˜_•¶�W