1. Ph.D. Student, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
2. Professor, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
3. Associate Professor, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, P.R. China.
4. Professor, Dept. of Civil Engineering, Monash Univ., Clayton VIC 3800, Australia.National 1000 Talents Program Professor, Dept of Civil Engineering, Tsinghua Univ, Beijing, China 100084,