1. Postdoctoral Associate, School of Transportation Science and Engineering, Beihang Univ., Beijing 100191, China; Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
2. Associate Professor, School of Transportation Science and Engineering, Beihang Univ., Beijing 100191, China (corresponding author).
3. Ph.D. Candidate, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.