1. Professor, Dept. of Civil Engineering, Qatar Univ., P.O. Box 2713, Doha, Qatar (corresponding author).
2. Graduate Research Assistant, Dept. of Civil Engineering, Qatar Univ., P.O. Box 2713, Doha, Qatar.
3. Professor, Dept. of Civil Engineering, Univ. of British Columbia, Vancouver, BC, Canada V6T 1Z4.
4. Graduate Research Assistant, Dept. of Civil Engineering, Univ. of British Columbia, Vancouver, BC, Canada V6T 1Z4.