1. Associate Professor, School of Civil Engineering and Transportation, South China Univ. of Technology, Guangzhou 510640, China.
2. Lecturer, School of Civil Engineering and Transportation, South China Univ. of Technology, Guangzhou 510640, China (corresponding author).
3. Professor, School of Civil Engineering and Transportation, South China Univ. of Technology, Guangzhou 510640, China.
4. Postgraduate Student, School of Civil Engineering and Transportation, South China Univ. of Technology, Guangzhou 510640, China.