1. Lecturer, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong, China (corresponding author).
3. Professor, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China.