1. Associate Professor, Dept. of Bridge Engineering, School of Civil Engineering Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong Univ., 111 Section of the Northbound 1, Second Ring Rd., Chengdu, Sichuan 610031, China.
2. M.S. Student, Dept. of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong Univ., 111 Section of the Northbound 1, Second Ring Rd., Chengdu, Sichuan 610031, China.
3. Postdoctoral Research Fellow, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 2350 Hayward St., Ann Arbor, MI 48109 (corresponding author).
4. Distinguished Professor, Dept. of Civil, Architectural and Environmental Engineering, Missouri Univ. of Science and Technology, 1401 North Pine St., Rolla, MO 65401.
5. Professor and Dean, School of Civil Engineering, Southwest Jiaotong Univ., 111 Section of the Northbound 1, Second Ring Rd., Chengdu, Sichuan 610031, China.
6. Associate Professor, School of Civil Engineering, Southwest Jiaotong Univ., 111 Section of the Northbound 1, Second Ring Rd., Chengdu, Sichuan 610031, China.