1. Ph.D. Candidate, Dept. of Civil Engineering, Univ. of Sherbrooke, Quebec, Canada.
2. Postdoctoral Fellow, Dept. of Civil Engineering, Univ. of Sherbrooke, Quebec, Canada.
3. Natural Science and Engineering Research Council of Canada and Canada Research Chair Professor, Dept. of Civil Engineering, Univ. of Sherbrooke, Sherbrooke, Quebec, Canada, J1K 2R1 (corresponding author).