1. Ph.D. Candidate, Dept. of Structural Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.
2. Associate Professor, Dept. of Structural Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China (corresponding author).
3. Professor, Dept. of Structural Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.