1. Associate Professor, Dept. of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China (corresponding author).
2. Engineer, Dept. of Civil Engineering, Beijing Jiaotong Univ. & Beijing Urban Construction Group Co. Ltd., Beijing 100044, People’s Republic of China.
3. Professor, Dept. of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China.
4. Lecturer, Dept. of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China.