1. Ph.D. Candidate, Dept. of Structural Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.
2. Professor, School of Civil Engineering, Qingdao Technological Univ., 11 Fushun Rd., Qingdao 266033, China (corresponding author).
3. Professor, Dept. of Structural Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.
4. School of Civil Engineering, Qingdao Technological Univ., 11 Fushun Rd., Qingdao 266033, China.