1. Ph.D. Candidate, School of Civil Engineering, Chongqing Univ., No. 83. Shabei St., Shapingba District, Chongqing 400045, China.
2. Professor, School of Civil Engineering, Chongqing Univ., No. 83. Shabei St., Shapingba District, Chongqing 400045, China (corresponding author).