1. School of Civil Engineering, Shijiazhuang Tiedao Univ., Shijiazhuang 050043, China.
2. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao Univ., Shijiazhuang 050043, China (corresponding author).
3. School of Civil Engineering, Shijiazhuang Tiedao Univ., Shijiazhuang 050043, China; China Railway Construction Corporation Limited, Beijing 100855, China.
4. School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China.