1. Professor, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332; Changjiang Scholar, School of Highway Engineering, Chang’an Univ., Xi’an, ShaanXi Province, China 710064, China.
2. Research Engineer, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332 (corresponding author).
3. Ph.D Student, School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332.