1. Austroads Fellow, Griffith School of Engineering, Griffith Univ., Gold Coast, QLD 4222, Australia (corresponding author).
2. Senior Research Fellow, Griffith School of Engineering, Griffith Univ., Gold Coast, QLD 4222, Australia.
3. Chief Scientist, Asset Management, ARRB Group Ltd., Melbourne, Victoria, 500 Burwood Hwy Vermont South, Gold Coast, VIC 3133, Australia.
4. Senior Lecturer, Griffith School of Engineering, Griffith Univ., Gold Coast, QLD 4222, Australia.