1. Faculty of Infrastructure Engineering, Dalian Univ. of Technology, No. 2 Linggong Rd., Ganjingzi District, Dalian, Liaoning 116024, China.
2. Professor, Faculty of Infrastructure Engineering, Dalian Univ. of Technology, No. 2 Linggong Rd., Ganjingzi District, Dalian, Liaoning 116024, China.
3. Dept. of Civil Engineering, Northeastern Univ., Shenyang, Liaoning 110819, China (corresponding author).