1. Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 498 Town Engineering, Ames, IA 50011 (corresponding author).
2. Associate Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, UCB 428, Boulder, CO 80302.
3. Professor, Dept. of Civil Engineering, Civil Engineering Lab Building Room 115, Texas A&M Univ., College Station, TX 77843-3136.
4. Eminent Scholar Emeritus, Del E. Webb School of Construction, Arizona State Univ., P.O. Box 6700, Chandler, AZ 85246.