1. Deputy Head and Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Auckland 1010, New Zealand.
2. Associate Professor, School of Economics and Management, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
3. Project Student, Dept. of Architecture and Civil Engineering, City Univ. of Hong Kong, Kowloon Tong, Hong Kong Special Administrative Region, China.