1. College of Civil Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, PR China
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan, PR China
3. Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA
4. National Engineering Laboratory for High-Speed Railway Construction, Central South University, Changsha, PR China
5. Engineering Research Center of Automotive Electronics and Embedded System, Chongqing University of Posts and Telecommunications, Chongqing, China
6. School of Civil Engineering, Beijing Jiaotong University, Beijing, China
7. Railway Maintenance Division, Zhengzhou Railway Bureau, Zhengzhou, Henan, PR China