1. Department of Mathematics, Qiqihar University, Qiqihar, People’s Republic of China
2. Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK
3. Faculty of Engineering Technology, The University of Twente, Twente, The Netherlands
4. Department of Mechanical Engineering, University of Sheffield, Sheffield, UK
5. Department of applied mechanics, University of Science and Technology, Beijing, People’s Republic of China