1. School of Civil Engineering, Chongqing University, Chongqing, China
2. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, China
3. Chongqing Research Institute of Harbin Institute of Technology, Harbin Institute of Technology, Chongqing, China
4. Ministry of Education, Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), Chongqing, China
5. Department of Civil and Environmental Engineering, University of California, Irvine, CA, USA