1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, 261 Glenbrook Rd., Unit 3037, Storrs, CT 06269-3037.
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, 261 Glenbrook Rd., Unit 3036, Storrs, CT 06269-3037.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, 261 Glenbrook Rd., Unit 3037, Storrs, CT 06269-3037 (corresponding author).