1. Professor, Dept. of Civil Engineering and Architecture, Univ. of Foshan, 18 Jiang Wan Rd., Foshan City, Guangdong 528000, P.R. of China.
2. Research Fellow, Dept. of Building and Construction, City Univ. of Hong Kong, 83 Tat Chee Ave., Kowloon, Hong Kong (corresponding author).
3. Associate Professor, Dept. of Building and Construction, City Univ. of Hong Kong, 83 Tat Chee Ave., Kowloon, Hong Kong.