Abstract
An investigation dealing with the interaction of local and overall buckling of thin-walled columns is described. Due to weakening effects of local buckling, overall buckling (flexural, torsional, or torsionalflexural) takes place at a lower load than the column would carry in the absence of local buckling. A solution scheme based on the finite element method is presented. The stiffness matrices presented by Barsoum and Gallagher are used in this study. The concept of effective width is used to account for the post-buckling strength of the locally buckled component plates. The post-buckling behavior and the use of effective width concept introduce nonlinearity into the problem. An interative solution procedure is employed in the solution scheme. A computer program has been prepared for the IBM 370/165 computer. The effects of local buckling on the column buckling strength are examined. Torsional—flexural buckling behavior of columns in the post-local-buckling range is discussed. Interaction of buckling modes is also discussed. Results on typical doubly and singly symmetric columns are presented.
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