1. Doctoral Student, Institute of Engineering Mechanics, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China.
2. Professor, Institute of Engineering Mechanics, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China (corresponding author).
3. Professor, Institute of Engineering Mechanics, Beijing Jiaotong Univ., Beijing 100044, People’s Republic of China.