1. Professor, College of Transportation, Jilin Univ., Changchun 130025, China.
2. M.S. Candidate, College of Transportation, Jilin Univ., Changchun 130025, China.
3. Postdoctoral Researcher, College of Transportation, Jilin Univ., Changchun 130025, China (corresponding author).
4. Associate Professor, College of Transportation, Jilin Jianzhu Univ., Changchun 130021, China.