1. Graduate Student, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China.
2. Professor, Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan Univ., Changsha, Hunan 410082, China (corresponding author).
3. Professor, Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan Univ., Changsha, Hunan 410082, China.