1. Ph.D. Candidate, Dept. of Bridge Engineering, Tongji Univ., Shanghai 200092, China; Institute of Structural Engineering, Vienna Univ. of Technology, Vienna 1040, Austria.
2. Professor, Dept. of Bridge Engineering, Tongji Univ., Shanghai 200092, China.
3. Lecturer, Dept. of Bridge Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).