1. Career Development Fellow, Centre for Infrastructure Engineering, Western Sydney Univ., Penrith, NSW 2751, Australia; Associate Professor, College of Architecture and Civil Engineering, Beijing Univ. of Technology, Beijing 100124, P.R. China.
2. Professor, Centre for Infrastructure Engineering, Western Sydney Univ., Penrith, NSW 2751, Australia (corresponding author).
3. Professor, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, P.R. China.
4. Professor, School of Civil Engineering, Univ. of Sydney, Sydney, NSW 2006, Australia.