1. Lecturer, School of Civil Engineering, National Engineering Laboratory for High-Speed Railway Construction, Central South Univ., Changsha, Hunan 410075, China.
2. Assistant Professor, Institute of Bridge Engineering, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, Buffalo, NY 14260.
3. Professor, School of Civil Engineering, National Engineering Laboratory for High-Speed Railway Construction, Central South Univ., Changsha, Hunan 410075, China (corresponding author).
4. Graduate Student, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, Buffalo, NY 14260.
5. Professor, School of Civil Engineering, National Engineering Laboratory for High-Speed Railway Construction, Central South Univ., Changsha, Hunan 410075, China.
6. Lecturer, Dept. of Civil and Architectural Engineering, Changsha Univ., Changsha, Hunan 410003, China.