1 Page 1-15 © MANTECH PUBLIATIONS 2016. All Rights Reserved Journal of Civil & Architectural Engineering Volume 1 Issue 2 Effectuality of Stiffeners in Plate using FEM Amit Kumar Gorai 1 , P. Pal 2 1 M.Tech Scholar, 2 Assistant Professor Department of Civil Engineering MNNIT Allahabad, U.P., India E-mail:amit.gorai.50@gmail.com 1 , prpal@mnnit.ac.in 2 Abstract This paper deals with the studies of the state of impacts of cross sections of stiffeners in improving the measure of displacement and frequency of stiffened plate. The plate has been modelled with single and cross stiffeners under the impact of transverse pressure load. The free vibration analysis of stiffened plate is carried out to ensure the overall validity of the results of displacement. First-order shear deformation theory (FSDT) is used in conjunction with the finite element approach using eight-noded quadratic isoparametric element. The numerical experiments on different samples are carried out by using Ansys Workbench 14.0.The comparison of results of deflection of the bare plate obtained in the present investigation is made with those available in the reported literature. Steel being a non- sustainable material, there is a necessity to use it very efficiently. Keeping this in mind, the volume of the material used is kept constant and the deflection and stress of the plate is minimized and the natural frequency is maximized to get an optimum combination of stiffener and plate. To investigate the behaviour of stiffened plate, parametric studies are carried out for different cases by varying the dimensions of stiffener i.e. length, thickness and depth. Keywords: Isotropic plates, Stiffener, Free-vibration analysis, FEM, Ansys. INTRODUCTION Stiffened plates are lightweight, high- strength and high strength-to-weight ratio structural members. A stiffened plate consists of a plate with integrated beams on one or both sides. The stiffeners enhance the rigidity of base structural element by increasing their cross- sectional moment of inertia so as to reduce the deflection of the structure. These plates are widely used in recent engineering applications viz. aerospace, bridge, ship