1. Professor, Division of Civil Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia (corresponding author).
2. PhD Candidate, Division of Civil Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia.
3. Professor, School of Engineering, Griffith Univ., Gold Coast, QLD 4111, Australia; formerly, Asian Institute of Technology, Bangkok, Thailand.