1. Professor, Dept. of Civil and Environmental Engineering, The Univ. of Western Ontario, London ON, Canada N6A 5B9 (corresponding author).
2. Application Engineering Manager, R-Theta, 6220 Krestrel Rd., Mississauga ON, Canada L5T 1Y9.
3. Professor, Dept of Mechanical and Manufacturing Engineering, Univ. of Calgary, Calgary AB, Canada T2N 1N4.