1. Professor, Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan Univ., Changsha, Hunan 410082, China (corresponding author).
2. Research Assistant, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China.
3. Research Assistant, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
4. Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.