1. Professor, Tsinghua-Gammon Construction Safety Research Center, Dept. of Construction Management, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
2. Ph.D. Candidate, Tsinghua-Gammon Construction Safety Research Center, Dept. of Construction Management, School of Civil Engineering, Tsinghua Univ., Beijing 100084, China.
3. Construction Manager, Longfor Properties Co. Ltd., 7/F, Tower 2, FuSheng Building, No. 4 Huixin East St., Chaoyang District, Beijing 100084, China.