1. Associate Professor, College of Civil and Architecture Engineering, Beijing Jiaotong Univ., Beijing 100044, China; Beijing Engineering Research Center of Rail Transit Safety and Disaster Prevention, Beijing 100044, China (corresponding author).
2. Researcher, Research Institute of Highway (RIOH), Ministry of Transportation, Beijing 100088, China.
3. Associate Professor, College of Civil and Architecture Engineering, Beijing Jiaotong Univ., Beijing 100044, China.