1. Professor, School of Civil Engineering and Architecture, Zhejiang Univ. of Technology, Hangzhou 310014, P.R. China.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Hong Kong Polytechnic Univ., Hong Kong, P.R. China (corresponding author).
3. Lecturer, School of Civil Engineering and Architecture, Zhejiang Univ. of Technology, Hangzhou 310014, P.R. China.