1. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast Univ., Nanjing 211189, China.
2. Graduate Student, School of Civil Engineering, Southeast Univ., Nanjing 211189, China.
3. Leonard Case Jr. Professor, Dept. of Civil and Environmental Engineering, Case Western Reserve Univ., Cleveland, OH 44106.
4. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast Univ., Nanjing 211189, China (corresponding author).