1. Professor, State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin Univ., 92 Weijin Road, Tianjin, China 300072 (corresponding author).
2. Graduate Student, Dept. of Hydraulic and Hydroelectric Engineering, School of Civil Engineering, Tianjin Univ., 92 Weijin Road, Tianjin, China 300072.
3. Professor, Member of Chinese Academy of Engineering, Dept. of Hydraulic and Hydroelectric Engineering, School of Civil Engineering, Tianjin Univ., 92 Weijin Road, Tianjin, China 300072.
4. Associate Professor, Dept. of Construction Management, Univ. of Houston, Houston TX 77204.