1. Ph.D. Candidate, Dept. of Civil Engineering, Univ. of Manitoba, Winnipeg, MB, Canada R3T 5V6; Lecture and Research Assistant, Dept. of Structural Engineering, Future Univ., Cairo 11835, Egypt.
2. Professor, Dept. of Civil Engineering, Univ. of Manitoba, Winnipeg, MB, Canada R3T 5V6 (corresponding author).