1. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast Univ., Nanjing 210096, PR China (corresponding author).
2. Ph.D. Candidate, School of Civil Engineering, Southeast Univ., Nanjing 210096, PR China.
3. Associate Professor, School of Civil and Transportation Engineering, Beijing Univ. of Civil Engineering and Architecture, Beijing 102616, PR China.