Key Basic Research Development Program of China (973 Program)(2015CB057706);National Natural Science Foundation of China(51178060);National Natural Science Foundation of China(51378081);Application Basic Research of Major Subject of Ministry of Transportation(2014319825160);China Postdoctoral Science Foundation(2014M552127);Open Fund of Key Laboratory of Bridge Engineering at Changsha University of Science & Technology of Hunan Province(13K04)