1. Ph.D. Candidate, Dept. of Civil Engineering, College of Civil and Architectural Engineering, Zhejiang Univ., Hangzhou 310058, China.
2. Professor, Dept. of Civil Engineering, College of Civil and Architectural Engineering, Zhejiang Univ., Hangzhou 310058, China (corresponding author).
3. M.S. Candidate, Dept. of Civil Engineering, College of Civil and Architectural Engineering, Zhejiang Univ., Hangzhou 310058, China.