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Extension of modal decomposition approach for buckling analysis of thin-walled lipped channel columns: Local, distortional, flexural and torsional modes
https://orcid.org/0000-0003-4710-976X
https://orcid.org/0000-0002-8171-7956
Abstract This paper presents a new version of the modal identification method previously proposed by the authors. The method is aimed at experimental tests of lipped channel columns but may also be applied to numerical columns. The first version of the method considered only three main deformation modes: local, symmetric distortional and minor axis flexural global modes. In this new version, anti-symmetric distortional and flexural–torsional modes are included in the formulation and original expressions for local mode are improved. The inclusion of new modes does not alter the procedure to perform the modal identification of the first version. In short, simple displacement functions are assumed for each buckling mode and through an error minimization process the participation of each mode in a generic deformed shape of the column is assessed. The new version of the method is validated against numerical results from Generalized Beam Theory (GBT) for columns undergoing D–G interaction and applied to experimental results of lipped channel columns.
Highlights A previously proposed modal identification for analysis of experimental results of lipped channel columns is expanded. Improved displacement functions for local buckling are proposed. The method is validated against GBT for numerical columns undergoing distortional–global interaction. The method is applied to results from experimental tests allowing the identification of the main buckling modes. Based on few experimental data, the proposed method is able to reconstruct entire deformed shape of experimental columns.
Extension of modal decomposition approach for buckling analysis of thin-walled lipped channel columns: Local, distortional, flexural and torsional modes
https://orcid.org/0000-0003-4710-976X
https://orcid.org/0000-0002-8171-7956
Abstract This paper presents a new version of the modal identification method previously proposed by the authors. The method is aimed at experimental tests of lipped channel columns but may also be applied to numerical columns. The first version of the method considered only three main deformation modes: local, symmetric distortional and minor axis flexural global modes. In this new version, anti-symmetric distortional and flexural–torsional modes are included in the formulation and original expressions for local mode are improved. The inclusion of new modes does not alter the procedure to perform the modal identification of the first version. In short, simple displacement functions are assumed for each buckling mode and through an error minimization process the participation of each mode in a generic deformed shape of the column is assessed. The new version of the method is validated against numerical results from Generalized Beam Theory (GBT) for columns undergoing D–G interaction and applied to experimental results of lipped channel columns.
Highlights A previously proposed modal identification for analysis of experimental results of lipped channel columns is expanded. Improved displacement functions for local buckling are proposed. The method is validated against GBT for numerical columns undergoing distortional–global interaction. The method is applied to results from experimental tests allowing the identification of the main buckling modes. Based on few experimental data, the proposed method is able to reconstruct entire deformed shape of experimental columns.
Extension of modal decomposition approach for buckling analysis of thin-walled lipped channel columns: Local, distortional, flexural and torsional modes
https://orcid.org/0000-0003-4710-976X
https://orcid.org/0000-0002-8171-7956
Abstract This paper presents a new version of the modal identification method previously proposed by the authors. The method is aimed at experimental tests of lipped channel columns but may also be applied to numerical columns. The first version of the method considered only three main deformation modes: local, symmetric distortional and minor axis flexural global modes. In this new version, anti-symmetric distortional and flexural–torsional modes are included in the formulation and original expressions for local mode are improved. The inclusion of new modes does not alter the procedure to perform the modal identification of the first version. In short, simple displacement functions are assumed for each buckling mode and through an error minimization process the participation of each mode in a generic deformed shape of the column is assessed. The new version of the method is validated against numerical results from Generalized Beam Theory (GBT) for columns undergoing D–G interaction and applied to experimental results of lipped channel columns.
Highlights A previously proposed modal identification for analysis of experimental results of lipped channel columns is expanded. Improved displacement functions for local buckling are proposed. The method is validated against GBT for numerical columns undergoing distortional–global interaction. The method is applied to results from experimental tests allowing the identification of the main buckling modes. Based on few experimental data, the proposed method is able to reconstruct entire deformed shape of experimental columns.
Extension of modal decomposition approach for buckling analysis of thin-walled lipped channel columns: Local, distortional, flexural and torsional modes
de Salles, Guilherme C. (author) / Batista, Eduardo de M. (author) / Cardoso, Daniel C.T. (author)
Thin-Walled Structures ; 181
2022-09-06
Article (Journal)
Electronic Resource
English
Local, Distortional, Flexural and Flexural-Torsional Buckling of Thin-Walled Columns
| British Library Conference Proceedings | 1999