1. Associate Professor, College of Civil and Transportation Engineering, Hohai Univ., Xikang Rd. 1#, Nanjing, Jiangsu 210098, P.R. China (corresponding author).
2. Professor, College of Civil and Transportation Engineering, Hohai Univ., Xikang Rd. 1#, Nanjing, Jiangsu 210098, P.R. China.
3. Master Student, College of Civil and Transportation Engineering, Hohai Univ., Xikang Rd. 1#, Nanjing, Jiangsu 210098, P.R. China.