1. Ph.D. Student, Dept. of Civil Engineering, Building 60, Monash Univ., Melbourne, VIC 3800, Australia.
2. Senior Lecturer, Dept. of Civil Engineering, Building 60, Monash Univ., Melbourne, VIC 3800, Australia (corresponding author).
3. Professor and Chair, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.