1. Lecturer, Dept. of Mechanical Engineering, North China Electric Power Univ., Baoding 071003, China.
2. Research Fellow, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong 999077, China.
3. Chair Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong 999077, China (corresponding author).
4. Professor, Dept. of Mechanical Engineering, North China Electric Power Univ., Baoding 071003, China.