1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Western Univ., London, ON N6A 5B9, Canada.
2. Professor, Dept. of Civil and Environmental Engineering, Western Univ., London, ON N6A 5B9, Canada (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Western Univ., London, ON N6A 5B9, Canada.