1. Associate Professor, Dept. of Civil and Transportation Engineering, Hohai Univ., No. 1 Xikang Rd., Nanjing 210098, China (corresponding author).
2. Postgraduate, Dept. of Civil and Transportation Engineering, Hohai Univ., No. 1 Xikang Rd., Nanjing 210098, China.
3. Professor, Dept. of Civil and Transportation Engineering, Hohai Univ., No. 1 Xikang Rd., Nanjing 210098, China.
4. Postgraduate, Anhui Transportation Holding Group Co. Ltd., No. 520 WangJiangXi Rd., Hefei 230088, China.