1. Professor, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China.
2. Graduate Student, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China.
3. Professor, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China (corresponding author).
4. Formerly, Graduate Student, College of Civil Engineering and Architecture, Zhejiang Univ., Hangzhou 310058, China.