1. ARC APD Fellow, School of Engineering, Univ. of Newcastle, Callaghan, NSW 2308, Australia.
2. Senior Lecturer, School of Engineering, Univ. of Newcastle, Callaghan, NSW 2308, Australia.
3. Ph.D. Student, School of Engineering, Univ. of Newcastle, Callaghan, NSW 2308, Australia.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Melbourne, VIC 3010, Australia.