1. Visiting Scholar from Zagazig University, Dept. of Civil and Environmental Engineering, Univ. of Missouri, Columbia, MO 65211.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Missouri, Columbia, MO 65211 (corresponding author).
3. Professor, Dept. of Civil Engineering, Jazan Univ., Arrawabi St., Jazan 45142, Saudi Arabia.