1. Senior Lecturer, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia (corresponding author).
2. Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia.
3. Professor, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia.
4. Professor, Faculty of Engineering and Industrial Sciences, Swinburne Univ. of Technology, Hawthorn, VIC 3122, Australia.