1. Assistant Professor, Dept. of Civil and Environmental Engineering, Carleton Univ., 1125 Colonel By Dr., Ottawa, ON, Canada K1S 5B6.
2. Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4 (corresponding author).
3. Professor, Dept. of Civil, Geological and Mining Engineering, École Polytechnique, 2900, boul. Édouard-Montpetit, Montréal, QC, Canada H3T 1J4.