1. Professor, School of Engineering, RMIT Univ., Melbourne 3000, Australia (corresponding author).
2. Research Fellow, School of Engineering, RMIT Univ., Melbourne 3000, Australia.
3. Lecturer, College of Engineering and Science, Victoria Univ., Melbourne 8001, Australia.
4. Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Strathclyde, Glasgow G1 1XJ, U.K.