1. Instructor, School of Engineering and Applied Science, Washington State Univ. Tri-Cities, Richland, WA 99354.
2. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910 (corresponding author).
3. Assistant Professor, Dept. of Mechanical Engineering, Northern Illinois Univ., DeKalb, IL 60115
4. Deceased; Formerly Regents Professor, School of Mechanical and Materials Engineering, Washington State Univ., Pullman, WA 99163