1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Delaware, 301 DuPont Hall, Newark, DE 19716 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., 405 Spokane St., Sloan Hall 30, Pullman, WA 99164.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin–Madison, 2215 Engineering Hall, Madison, WI 53706.