1. Ph.D.Candidate, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China; Visiting Ph.D.Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
2. Associate Professor, Dept. of Civil Engineering, Togji Univ., 1239 Siping Rd., Shanghai 200092, China.
3. Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China (corresponding author).
4. Nathan M. and Anne M. Newmark Endowed Chair in Civil Engineering and Director, Newmark Structural Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 North Mathews Ave., Urbana, IL 61801.