1. Prof., Dept. of Arch. and Envir. Des., Kyoto Univ., Yoshida-honmachi, Sakyoku, Kyoto 606-8317 Japan.
2. Sr. Res., Steel Struct. Devel. Ctr., Steel Res. Lab., Tech. Devel. Bureau, Nippon Steel Corp., 20-1, Shintomi, Futtsu, Chiba 293-8511 Japan.
3. Chf. Res. Engr., Tech. Res. Lab., Takenaka Corp., 1-5-1 Otsuka, Inzai, Chiba 270-1352 Japan.