1. Graduate Student, Dept. of Civil, Structural, and Environmental Engineering, Univ. at Buffalo, Buffalo, NY 14260 (corresponding author).
2. Associate Professor, Dept. of Structural Engineering, Univ. of California, San Diego, CA 92093.
3. Research Fellow, Faculty of Science, Engineering and Technology, Swinburne Univ. of Technology, Melbourne, VIC 3122, Australia.