1. Department of Bridge Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu, China;
2. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China;
3. Center for Infrastructure Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Bentley, WA, Australia;
4. T. Y. Lin International Engineering Consulting (China) Co., Ltd, Chongqing, China