1. Associate Professor, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China (corresponding author).
2. Master Candidate, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China.
3. Undergraduate Student, Dept. of Computer Science and Technology, Tsinghua Univ., Beijing 100084, China.
4. Professor, School of Engineering and Built Environment, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia.