1. Professor, College of Civil Engineering, Hunan City Univ., Yiyang 413000, China (corresponding author).
2. Postgraduate Student, College of Civil Engineering, Hunan Univ., Changsha 410082, China.
3. Postgraduate Student, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha 410114, China.
4. Associate Professor, College of Civil Engineering, Hunan City Univ., Yiyang 413000, China.