1. Associate Professor, School of Civil Engineering, Central South Univ., Changsha 410075, Hunan, China.
2. Assistant Research Professor, Engineering School of Sustainable Infrastructure and Environment, Univ. of Florida, Gainesville, FL 32605-0281 (corresponding author).
3. Raymond-Blythe Professor, Dept. of Civil Engineering, Univ. of Kentucky, Lexington, KY 40506-0281.
4. Professor, School of Civil Engineering, Central South Univ., Changsha 410075, Hunan, China.