1. Associate Professor of Civil and Geotechnical Engineering, School of Civil and Environmental Engineering, Univ. of Technology Sydney, City Campus P.O. Box 123 Broadway, Sydney, NSW 2007, Australia (corresponding author).
2. Ph.D. Candidate, School of Civil and Environmental Engineering, Univ. of Technology Sydney, Sydney, NSW 2007, Australia.
3. Assistant Professor, Dept. of Civil Engineering, Shanghai Univ., Shanghai 200444, China.