1. Ph.D. Student, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR.
2. Professor, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR.
3. Ph.D. Candidate, School of Civil and Construction Engineering, Oregon State Univ., Corvallis, OR; Lecturer, Dept. of Civil Engineering, Faculty of Engineering, Islamic Univ. of Madinah, Madinah, Saudi Arabia.