1. Associate Professor, School of Civil Engineering, Univ. of Lanzhou Jiaotong, Lanzhou 730070, China (corresponding author).
2. Master’s Candidate, School of Civil Engineering, Univ. of Lanzhou Jiaotong, Lanzhou 730070, China.
3. Engineer, China Railway Design Corporation, No. 109, Dongqi Rd., Airport Economic Zone, Tianjin 300308, China.
4. Professor, School of Civil Engineering, Univ. of Lanzhou Jiaotong, Lanzhou 730070, China.