Behavioural Response of Elasto-Plastic Deformations for Concrete Cylindrical Shells Using 4 Noded Flat Plate Elements by Finite Element Method of Analysis with an Incremental Loading Technique

Paper deals with the phenomenon of elasto-plastic deformations for the concrete cylindrical shells. The investigation is conducted through finite element modelling wherein for a fixed geometry of the section. The parameters of span are considered. The thickness for the problems tackled is kept equal to 12.5cms considering shell as thin type. The initial point of the analysis is the inherent elastic stresses arising from the self weight of the shells. Subsequent loading is in the form of small size loading increments wherein two types of loads are considered. These are uniform surcharge over the top surface of shell and longitudinal thrust over the span. For the finite element modelling, the type of element considered is 4 noded flat plate elements. The results related to the elasto-plastic deformations are presented in the form of the plastic flow pattern as the applied load is incremented.