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