1. Research Assistant, School of Civil Engineering, Univ. of Sydney, Sydney, NSW 2006, Australia.
2. Professor, School of Civil Engineering, Southeast Univ., Nanjing 210018, P.R. China.
3. Professor, School of Mechanical, Materials and Mechatronic Engineering, Univ. of Wollongong, Wollongong, NSW 2500, Australia.
4. Senior Lecturer, School of Civil Engineering, Univ. of Sydney, Sydney, NSW 2006, Australia (corresponding author).