1. School of Civil Engineering, Central South University, Changsha 410075, China
2. MOE Key Laboratory of Engineering Structures of Heavy-haul Railway, Central South University, Changsha 410075, China
3. Center for Railway Infrastructure Smart Monitoring and Management, Central South University, Changsha 410075, China
4. China Academy of Railway Sciences, Beijing 100000, China
5. Guangxi Transportation Science and Technology Group Co. Ltd., Nanning 530006, China