1. Graduate Student, Dept. of Civil and Environmental Engineering, Mississippi State Univ., 501 Hardy Rd., 235 Walker Engineering Building, P.O. Box 9546, Mississippi State, MS 39762.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Mississippi State Univ., 501 Hardy Rd., 235C Walker Engineering Building, P.O. Box 9546, Mississippi State, MS 39762 (corresponding author).