[Chen, Xiangyang] Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, Changsha 410114, Hunan, Peoples R China.^[Yan, Hengzhen] Hunan City Univ, Dept Urban Construct, Changsha 413000, Hunan, Peoples R China.^[Liu, Xinxi] Chnagsha Univ Sci & Technol, Sch Civil Engn & Architecture, Changsha 410004, Hunan, Peoples R China.