1. Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Butler-Carlton Hall, 1401 N Pine St., Rolla, MO 65409.
2. Associate Professor, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Butler-Carlton Hall, 1401 N Pine St., Rolla, MO 65409 (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Engineering Bldg., 1372 Campus Delivery, Fort Collins, CO 80523.