1. Ph.D. Student, School of Civil Engineering and Built Environment, Science and Engineering Faculty, Queensland Univ. of Technology, 2 George St., Brisbane, QLD 4000, Australia.
2. Lecturer in Civil Engineering, School of Civil Engineering and Built Environment, Science and Engineering Faculty, Queensland Univ. of Technology, 2 George St., Brisbane, QLD 4000, Australia (corresponding author).
3. Professor, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia.
4. Associate Professor of Structural Engineering, School of Civil, Mining and Environmental Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.