1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
2. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
3. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China