[1] Sch Pedag & Technol Educ, Computat Mech Lab, Athens, Greece
[2] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam
[3] Hellen Open Univ, Sch Sci & Technol, Parodos Aristotelous 18, GR-26335 Patras, Greece
[4] Democritus Univ Thrace, Dept Civil Engn, GR-67100 Xanthi, Greece
[5] Univ Sheffield, Dept Civil & Struct Engn, Sheffield, S Yorkshire, England