1. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.
2. Research Associate Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.
3. Graduate Student, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.
4. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910 (corresponding author).