1. Postdoctoral Researcher, Geotechnical Engineering Dept., Nanjing Hydraulic Research Institute, Nanjing 210029, China; formerly, Univ. of New South Wales, Sydney, NSW 2052, Australia.
2. Research Associate, Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia.
3. Deceased January 7, 2016; formerly, Senior Lecturer, Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia.
4. Associated Professor, Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia (corresponding author).