1. Diploma Student, Dept. of Civil and Environmental Engineering, Univ. of Stuttgart, 70569 Stuttgart, Germany; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, 261 Glenbrook Rd., Storrs, CT 06269.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, 261 Glenbrook Rd., Storrs, CT 06269-2037 (corresponding author).