1. Lecturer, School of Civil Engineering, Sichuan Agricultural Univ., Chengdu 611830, China; Ph.D. Student, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China.
2. Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400044, China; Professor, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China (corresponding author).
3. Ph.D. Student, School of Civil Engineering, Chongqing Univ., Chongqing 400044, China.
4. Lecturer, Institute of Road and Bridge Engineering, Dalian Maritime Univ., Dalian 116023, China.
5. Master, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China.
6. Professor, Dept. of Mechanical Engineering, Univ. of Houston, Houston, TX 77204.