1. Professor, Dept. of Bridge Engineering, School of Civil Engineering, Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong Univ., Chengdu, Sichuan 610031, China (corresponding author).
2. M.S. Student, Dept. of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu, Sichuan 610031, China.
3. Assistant Professor, Dept. of Civil, Environmental and Ocean Engineering, Stevens Institute of Technology, Hoboken, NJ 07030.
4. Senior Engineer, Southern Sichuan Intercity Railway Co. Ltd, Zigong, Sichuan 610031, China.
5. Professor and Dean, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu, Sichuan 610031, China.