1. Sumitomo Light Metal Industries, Ltd., JS Progress Bldg., 4-1-23 Heiwajima, Ohta-ku, Tokyo 143-0006, Japan
2. Assoc. Prof., Dept. of Architecture, Faculty of Engineering, Kanto Gakuin Univ., Dr. Eng. Kanazawa-ku, Yokohama-shi 236-8501, Japan
3. Iijima Structural Design Office, Dr. Eng., Nisshin Bldg., 1-25-1 Aoi, Higashi-ku, Nagoya-shi 461-0004, Japan
4. Prof., Dept. of Architecture and Civil Engineering, Toyohashi Univ. of Technology, Dr. Eng., Tempaku-cho, Toyohashi-shi 441-8580, Japan