1. Department of Civil Engineering, Division of Structural Engineering, University of Patras, GR-26504, Patras, Greece
2. Nonlinear Analysis and Applied Mathematics, (NAAM)-Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
3. Department of Physics, School of Science, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece