1. Dept. of Civil and Environmental Engineering, Washington State Univ. P.O. Box 642910, Pullman, WA 99164-2910, US, (Corresponding author), e-mail: ashraf@wsu.edu
2. Dept. of Civil and Environmental Engineering, Washington State Univ. P.O. Box 642910, Pullman, WA 99164-2910, US.