1. Associate Professor, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, P.R. China.
2. Engineer, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, P.R. China.
3. Ph.D. Candidate, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, P.R. China.
4. Lecturer, College of Civil Engineering and Architecture, Zhejiang Univ. of Technology, Hangzhou 310014, P.R. China (corresponding author).