1. Associate Professor, Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast Univ., Nanjing 210096, P.R. China.
2. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures, Ministry of Education, Southeast Univ., Nanjing 210096, P.R. China (corresponding author).
3. Postgraduate Researcher, School of Civil Engineering, Southeast Univ., Nanjing 210096, P.R. China.
4. Professor, Beijing Univ. of Civil Engineering and Architecture, Beijing 100044, P.R. China.