Distortional elastic buckling for aluminium Available prediction models versus design specifications
article
Accurate prediction of buckling behaviour of aluminium structural elements with thinwalled cross-sectional shapes is important for efficient design. Many recent investigations in terms of cross-sectional instability have proved that distortional buckling has a substantial effect on the structural behaviour of aluminium thin-walled members. Aluminium design rules are limited regarding the distortional buckling phenomenon and simplified to meet the theoretical solutions of the plate-buckling problem. However, the plate buckling problem does not reflect the real cross-sectional instability behaviour because the edge restrained conditions of each plate element are not taken into account. In this respect, prediction models like the Direct Strength Method which is based on the elastic buckling solutions for the entire cross-section can achieve these requirements. In order to provide a reliable design approach specifically for aluminium, a new prediction model for distortional buckling of C-shaped thin-walled cross-sections has been developed (Kutanova model [2009]). This model is based on advanced non-linear finite element analyses that include the interaction of crosssectional plate elements. In this study, the distortional bucking resistance of C-sections has been calculated according to the current design rules (AA Specification and Eurocode 9) and two prediction models: the Direct Strength Method and the Kutanova model. The calculations using these different approaches mainly show the inconsistencies in results provided by the aluminium design standards compare to the prediction models.
Topics
AluminiumBucklingDesign specificationDistortional bucklingThin-walled cross-sectionsAccurate predictionAluminiumBuckling behaviourC-shapedCross-sectional platesCross-sectional shapeDesign approachesDesign rulesDesign specificationDesign standardDirect strength methodsDistortional bucklingEfficient designsElastic bucklingEurocodesNon-linear finite-element analysisPlate bucklingPlate elementsPrediction modelStructural behaviourStructural elementsTheoretical solutionsThin-walledThin-walled membersAluminumDesignFinite element methodForecastingMathematical modelsPlates (structural components)SpecificationsThin walled structuresBuckling
TNO Identifier
954147
ISSN
00467316
Source
Heron, 55(3-4), pp. 251-268.
Pages
251-268