1. Professor, Dept. of Civil Engineering, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua Univ., Beijing, 100084, People’s Republic of China (corresponding author).
2. Associate Professor, College of Civil Engineering, Hunan Univ., Yuelu Mountain, Changsha, Hunan Province, 410082, People’s Republic of China.
3. Reader, School of Mechanical, Aerospace, and Civil Engineering (MACE), Univ. of Manchester, P.O. Box 88, Manchester M60 1QD, U.K.