1. Associate Professor, Dept. of Civil Engineering, 151C Raymond Bldg., Univ. of Kentucky, Lexington, KY 40506-0281 (corresponding author).
2. Graduate Research Assistant, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
3. Formerly, Graduate Research Assistant, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.