1. Lecturer, School of Natural and Built Environments, Univ. of South Australia, North Terrace and Frome Rd., Adelaide, SA 5000, Australia (corresponding author).
2. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo, ON, Canada N2L 3G1.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Room 2340 G.G. Brown Bldg., Ann Arbor, MI 48109.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo, ON, Canada N2L 3G1.
5. Professor Emeritus, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, 200 University Ave. West, Waterloo, ON, Canada N2L 3G1.