1. Professor, School of Civil Engineering Bridge, Changsha Univ. of Science and Technology, Changsha, Hunan 410004, China.
2. Ph.D. Candidate, School of Civil Engineering Bridge, Changsha Univ. of Science and Technology, Changsha, Hunan 410004, China.
3. Associate Professor, School of Civil Engineering Bridge, Changsha Univ. of Science and Technology, Changsha, Hunan 410004, China (corresponding author).