1. Assistant Professor, Dept. of Civil and Environmental Engineering, Carleton Univ., 1125 Colonel By Dr., Ottawa, ON, Canada K1S 5B6; formerly, Ph.D. Candidate, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4.
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, P.O. Box 6079, Station “Centre-Ville”, Montreal, QC, Canada H3C 3A7.