1. Ph.D. Candidate, Tsinghua-Gammon, Construction Safety Research Center, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China; and, Faculty Member, National Univ. of Sciences and Technology, Rawalpindi, Pakistan. E-mail: choudhry03@gmail.com
2. Professor and Director, Tsinghua-Gammon Construction Safety Research Center, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China. E-mail: fangdp@tsinghua.edu.cn
3. Professor and Director, Center for Infrastructure Engineering and Management, Griffith Univ., Queensland 9726, Australia. E-mail: s.mohamed@griffith.edu.au