KE Shi-tang1,HOU Xian-an2,YAO You-cheng2,LIANG Ya-li2,WANG Fa-wu1
(1. Dept of Civil Engineering, Nanjing Univ of Aeronautics and Astronautics, Nanjing, Jiangsu210016, China;2. Northwest Electric Power Institute, China Power Engineering Consulting Group Corporation, Xi’an, Shaanxi710075,China)