1. Adjunct Professor, Dept. of Civil Engineering, 2324 Main Mall, Univ. of British Columbia, Vancouver, BC, Canada V6T 1W5 (corresponding author).
2. Assistant Professor, Dept. of Civil Engineering, American Univ. of Sharjah, P.O. Box 26666, Sharjah, United Arab Emirates.
3. Professor, Dept. of Civil Engineering, 2324 Main Mall, Univ. of British Columbia, Vancouver, BC, Canada V6T 1W5.
4. Graduate Student, Dept. of Civil Engineering, 2324 Main Mall, Univ. of British Columbia, Vancouver, BC, Canada V6T 1W5.