1. Professor, School of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
2. Master’s Student, School of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, China; Engineer, Beijing General Municipal Engineering Design & Research Institute Co., Ltd., Beijing 100082, China.
3. Associate Professor, School of Civil Engineering, Beijing Jiaotong Univ., Beijing 100044, China.