1. Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang, P.R. China
2. Department of Civil Engineering, Siegen, Germany
3. College of Mechanics and Materials, Hohai University, Nanjing, P.R. China
4. Hebei Key Laboratory for Mechanics of Smart Materials and Structures, Shijiazhuang Tiedao University, Shijiazhuang, P.R. China