1. Lecturer, School of Civil Engineering and Transportation, State Key Laboratory of Subtropical Building Science, South China Univ. of Technology, Guangzhou 510640, China.
2. Professor, Dept. of Civil Engineering, Univ. of Hong Kong, Pokfulam Rd., Hong Kong (corresponding author).
3. Professor, School of Civil Engineering and Built Environment, Queensland Univ. of Technology (QUT), Garden Point Campus, GPO Box 2434, Brisbane, QLD 4001, Australia.