1. Ph.D. Candidate, College of Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.
2. Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China (corresponding author).
3. Professor, Dept. of Civil, Environmental and Mechanical Engineering, Univ. of Trento, Via Mesiano, 77, Trento 38123, Italy.