1. Assistant Lecturer, Structural Engineering Dept., Zagazig Univ., Zagazig 44519, Egypt; presently, Visiting Scholar, Dept. of Civil and Environmental Engineering, Univ. of Missouri, Columbia, MO 65211-2200.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Missouri, Columbia, MO 65211-2200 (corresponding author).
3. Professor, Structural Engineering Dept., Zagazig Univ., Zagazig 44519, Egypt.
4. Associate Professor, Structural Engineering Dept., Zagazig Univ., Zagazig 44519, Egypt.