1. Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China.
2. Professor, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China (corresponding author).
3. Postdoctoral Researcher, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China.
4. Ph.D. Candidate, School of Civil Engineering, Chongqing Univ., Chongqing 400045, China.
5. Professor, Dept. of Civil Engineering, Pennsylvania State Univ., Middletown, PA 17057.