1. Ph.D. Candidate, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China.
2. Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50010.
3. Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).