1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong, China.
2. Senior Lecturer, School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, Univ. of Wollongong, Northfields Ave., Wollongong, NSW 2522, Australia (corresponding author).
3. Chair Professor of Structural Engineering, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong, China.