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