1. Lecturer, School of Civil Engineering, Xi’an Univ. of Architecture & Technology, Xi’an, Shaanxi 710055, China (corresponding author).
2. Professor, School of Transportation, Southeast Univ., Nanjing, Jiangsu 210096, China.
3. Graduate Student, School of Civil Engineering, Xi’an Univ. of Architecture & Technology, Xi’an, Shaanxi 710055, China.
4. Associate Professor, School of Civil Engineering, Xi’an Univ. of Architecture & Technology, Xi’an, Shaanxi 710055, China.