1. Research Engineer, Construction Industry Institute, 3925 West Braker Ln. (R4500), Austin, TX 78759-5316.
2. Associate Professor, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
3. Raymond Shaver Chair Professor, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.