1. Graduate Research Assistant, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
2. Associate Professor, Dept. of Civil Engineering, 151C Raymond Bldg., Univ. of Kentucky, Lexington, KY 40506-0281 (corresponding author).
3. Professor, Dept. of Civil Engineering, Univ. of Waterloo, Waterloo, Ontario, Canada.
4. Assistant Professor, Dept. of Civil, Architectural and Environmental, Austin, TX.