1. Associate Professor, Dept. of Civil Engineering, National Chiao Tung Univ., 1001 Ta-Hsueh Rd., Hsinchu, Taiwan 30050.
2. Associate Research Fellow, National Center for Research on Earthquake Engineering, Taipei, Taiwan 10617.
3. Professor, Dept. of Civil Engineering, National Cheng Kung Univ., Tainan, Taiwan 70101.
4. Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei, Taiwan 10617.
5. Graduate Student, Dept. of Civil Engineering, National Taiwan Univ., Taipei, Taiwan 10617.
6. Former Graduate Student, Dept. of Civil Engineering, National Taiwan Univ., Taipei, Taiwan 10617.
7. Former Graduate Student, Dept. of Civil Engineering, National Cheng Kung Univ., Tainan, Taiwan 70101.