Buckling resistance of orthotropic plates subjected by compression interpolation between plate and column-like behavior

摘要

It is commonly known that compression resistance of longitudinally stiffened orthotropic plates depends on both the column and plate-like behavior. Large number of previous investigations studied the structural behavior of stiffened plates subjected to compression. However, a comprehensive investigation and a parametric study is not available in the international literature about applicable interpolation function for plates having closed section stiffeners. It is known from previous research results that the interpolation function can be different depending on the calculation method of the critical stresses (analytical or numerical). It is also known, that the application of the numerically computed critical stresses in the Eurocode based design method can lead to over-estimation of the compression resistance through the increased critical stress resulting in smaller slenderness ratio. However, there is no recommendation for applicable interpolation formula when computed critical stresses are used by the designers. Therefore, the current research program focuses on the investigation of longitudinally stiffened orthotropic plates, studying the interpolation curve between plate and column-like buckling behavior. The applicability of the EN 1993-1-5 based interpolation curve is discussed and evaluated. The reason of the differences by using analytical and numerical critical stresses are explained and applicable interpolation function is proposed for both cases. (C) 2019 Elsevier Ltd. All rights reserved.