1. Professor, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong (corresponding author).
2. Research Fellow, Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.
3. Emeritus Professor, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.