1. Research Engineer, Structural Engineering and Earthquake Simulation Laboratory, Dept. of CSEE, Univ. at Buffalo, Buffalo, NY 14260 (corresponding author).
2. Assistant Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, Austin, TX 78712.
3. Assistant Research Fellow, National Center for Research on Earthquake Engineering, No. 200, Sec. 3, Xinhai Rd., Taipei 10617, Taiwan.
4. Associate Professor, Dept. of CEE, Univ. of Washington, Seattle, WA 98145.
5. Professor, Dept. of CSEE, Univ. at Buffalo, Buffalo, NY 14260.
6. Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei 10617, Taiwan.