1. Professor of Civil Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia (corresponding author).
2. Ph.D. Candidate, Faculty of Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.
3. Associate Professor, Faculty of Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.