1. Professor, Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast Univ., 2 Sipailou Rd., Xuanwu District, Nanjing 210096, China (corresponding author).
2. Ph.D. Student, Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast Univ., 2 Sipailou Rd., Xuanwu District, Nanjing 210096, China.
3. Dept. of Civil and Environmental Engineering, Univ. of Michigan, Ann Arbor, MI 48109.
4. Assistant Professor, Jinling Institute of Technology, 99 Hongjing Ave., Jiangning District, Nanjing 211169, China.