1. Chair Professor of Structural Engineering, Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic Univ., Hong Kong, China. E-mail: cejgteng@polyu.edu.hk
2. Research Student, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China; formerly, Research Assistant, Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic Univ., Hong Kong, China.
3. Senior Research Fellow, Dept. of Civil and Structural Engineering, The Hong Kong Polytechnic Univ., Hong Kong, China.
4. Professor, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China.