1. Department of Construction and Real Estate, Southeast University, Nanjing, 210096, P. R. China; Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, USA
2. Department of Civil & Environmental Engineering, University of Maryland, College Park, MD 20742-3021, USA
3. Department of Construction Management and Real Estate, Southeast University, Nanjing, 210096, P. R. China
4. School of Transportation Engineering, Southeast University, Nanjing, 210096, P. R.China