1. Structural Engineer, Shanghai Research Institute of Building Science, 75 South Wanping Rd., Shanghai, 200032, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720-1710.
3. Professor, Disaster Prevention Research Institute, Kyoto Univ., Gokasho, Uji, Kyoto 611-0011, Japan.