1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo, ON, Canada N2L 3G1.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. W., Waterloo, ON, Canada N2L 3G1 (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo, ON, Canada N2L 3G1.