1. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong 999077, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong 999077, China (corresponding author).
3. Chair Professor of Structural Engineering, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong 999077, China.