1. Associate Professor, Structural Engineering Dept., Faculty of Engineering, Cairo Univ., 12613 Giza, Egypt.
2. Ph.D. Student, Civil and Environmental Engineering Dept., Univ. of Illinois at Urbana Champaign, 3140 Newmark Civil Engineering Lab., 205 N. Mathews Ave., Urbana, IL 61801.
3. Professor of Construction Engineering and Management, Structural Engineering Dept., Faculty of Engineering, Cairo Univ., 12613, Giza, Egypt.