1. Associate Professor, College of Civil Engineering and Mechanics, Xiangtan Univ., Xiangtan 411105, China.
2. Graduate Student, College of Civil Engineering and Mechanics, Xiangtan Univ., Xiangtan 411105, China.
3. Ph.D. Candidate, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha 410114, China.
4. Professor, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha 410114, China (corresponding author).
5. Professor, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha 410114, China.