1. Lecturer, Dept. of Civil Engineering, Changzhou Univ., Changzhou, Jiangsu 213164, China.
2. Professor, College of Mechanics and Materials, Hohai Univ., Nanjing, Jiangsu 210098, China (corresponding author).
3. Professor, Dept. of Civil Engineering, Changzhou Univ., Changzhou, Jiangsu 213164, China.
4. Associate Professor, Dept. of Civil Engineering, Changzhou Univ., Changzhou, Jiangsu 213164, China.