1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan, China
2. Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan, China
3. Department of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, Australia
4. Fourth Design Branch, Guangdong Communication Planning & Design Institute Group Co. Ltd, Guangdong, Guangzhou, China