1. Associate Professor, Civil Engineering Dept., Univ. of Waterloo, Waterloo ON, Canada N2L 3G1 (corresponding author).
2. Graduate Student, Civil Engineering Dept., Univ. of Waterloo, Waterloo ON, Canada N2L 3G1.
3. Assistant Professor, Mansoura Univ., Mansoura, Egypt; presently, Post Doctoral Fellow, Civil Engineering Dept., University of Waterloo, Waterloo ON, Canada N2L 3G1.