1. Professor, Dept. of Bridge Engineering, Hunan Univ., Changsha, Hunan 410082, China.
2. Ph.D. Candidate, Dept. of Bridge Engineering, Hunan Univ., Changsha, Hunan 410082, China.
3. Lecturer, Dept. of Bridge Engineering, Hunan Univ., Changsha, Hunan 410082, China (corresponding author).
4. Graduate Student, Dept. of Bridge Engineering, Hunan Univ., Changsha, Hunan 410082, China.