[Wu, Weixiang] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.^[Li, Zhongnong] Hunan Univ, Minist Educ, Key Lab Bldg Safety & Energy Efficiency, Changsha 410082, Hunan, Peoples R China.^[Wang, Zhifeng] Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China.