[Zhou, Xiling;Xie, Youjun;Zheng, Keren;Cai, Fengliang] Cent South Univ Technol, Sch Civil Engn, Changsha 410075, Peoples R China.^[Zhou, Xiling] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.^[Zhang, Sheng] Natl Univ Def Technol, Coll Basic Educ Commanding Officers, Changsha 410072, Peoples R China.