1. Professor, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada. E-mail: Patrick.Paultre@USherbrooke.ca
2. Associate Professor, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada.