1. Professor, Ministry of Education Key Laboratory of Safety Control of Bridge Engineering, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha 410004, China.
2. Associate Professor, Ministry of Education Key Laboratory of Safety Control of Bridge Engineering, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha 410004, China (corresponding author).
3. Edwin B. Norma S. McNeil Distinguished Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.