Structural performance of eccentrically stiffened square plates subjected to hydrostatic load using finite element analysis

The present study analyses plate structures subjected to hydrostatic load. The plates are modelled and analysed using finite element method-based software, ANSYS Workbench . The unstiffened plate structure is first examined, and responses are recorded. Further, the plate is stiffened using one, cross (two) and three flat stiffeners, considering almost the same volume of material as used in the modelling of an unstiffened plate. The static response of plate structures is presented and compared by keeping all edges of the plates either hinged or clamped. The thickness of the plate or stiffener is kept at a minimum of 6 mm as specified in IS 800:1984 (Clause no. 3.8.2). The outstand of the stiffeners are modelled based on IS 800: 2007 (Clause no. 8.7.1.2). The different configurations of stiffened plates are further compared with unstiffened plate, also the stiffeners placements are changed between horizontal and vertical (except in cross stiffened plate). The spacing between the central and extreme stiffeners is kept constant, and the extreme stiffeners are placed at the centre of the central stiffener and the extreme edge of the plate. The results highlight the influence of stiffening configurations or stiffener eccentricity in decreasing deflection and stress under hydrostatic load. It is found that the eccentric position produces a serious impact on the distribution of stiffness, transfer of stress and the overall structural response of the plate. The study offers helpful information for improving plate-stiffener systems in real, practical applications involving hydrostatic pressure.