1. Graduate Student, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Ontario, Canada M5S 1A4 (corresponding author).
2. Assistant Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Ontario, Canada M5S 1A4.
3. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Ontario, Canada M5S 1A4.