1. Associate Professor, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China.
2. Postgraduate Student, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China.
3. Professor, School of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China; Professor, Key Laboratory of Heavy-Haul Railway Engineering Structure, Ministry of Education, Central South Univ., Changsha, Hunan 410075, China (corresponding author).