1. Associate Professor, Dept. of Bridge Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China (corresponding author).
2. Senior Lecturer, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Sheffield S1 3JD, U.K.
3. Professor, Dept. of Civil and Structural Engineering, Univ. of Sheffield, Sheffield S1 3JD, U.K.