1. Ph.D. Candidate, School of Transportation, Southeast Univ., 2 Si pai lou, Nanjing 210096, PR China.
2. Professor, School of Transportation, Southeast Univ., 2 Si pai lou, Nanjing 210096, PR China (corresponding author).
3. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Advanced Technology for Large Structural Systems Engineering Research Center, Lehigh Univ., 27 Memorial Dr West, Bethlehem, PA 18015.