1. Senior Associate, Wiss, Janney, Elstner Associates, Inc., 6363 North State Highway 161, Suite 550, Irving, TX 75038.
2. Professor, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Dr. SE, Minneapolis, MN 55455 (corresponding author).
3. Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 394 Town Engineering, Ames, IA 55011.