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RESUMO : Este trabalho avaliou o desempenho relativo de perfis de alma senoidal quando comparados aos perfis de alma plana atraves do estudo numerico da flambagem local em mesas (FLM) de barras submetidas a compressao axial. Para a realizacao deste estudo foram discretizados dois modelos via Metodo dos Elementos Finitos (MEF) com o emprego do programa ABAQUS ® . A metodologia numerica baseou-se em realizar analise de carga critica de flambagem local, mantendo-se fixo os valores de largura de mesas, espessura e altura de alma para cada perfil e alterar gradativamente a espessura das mesas, sendo possivel atingir varios resultados de tensao critica para cada esbeltez, definindo-se a curva tensao versus esbeltez da fase elastica. A partir dos resultados numericos obtidos foi possivel realizar a parametrizacao analitica com as prescricoes da norma ABNT NBR 8800:2008 e fazer uma proposicao de metodologia de calculo para os parâmetros de esbeltez das mesas. Posteriormente, realizaram-se comparativos entre o desempenho dos perfis de alma senoidal e o dos perfis de alma plana. Os resultados numericos mostraram que o desempenho de um perfil de alma senoidal pode ser ate 8% mais eficiente que o dos perfis de alma plana, no que tange a possibilidade de colapso do perfil sem a ocorrencia de FLM quando submetidos a compressao axial. ABSTRACT : This work evaluated the relative performance of sinusoidal web profiles through the numerical study of flange local buckling (FLB) for simple bars under compressive strength, when compared to flat web profiles. For this study, two models were discretized using the Finite Element Method (FEM) through the ABAQUS® program. The numerical methodology was based on Buckle analysis, maintaining the values of table width, web thickness and web height for each profile and gradually changing the thickness of the flanges, this way was possible to reach several results of critical tension for each slenderness, being defined the curve of the elastic phase. From the numerical results obtained it was possible to perform the analytical parameterization with the norm ABNT NBR8800:2008 and to make a proposition of calculation for the parameters of slenderness that limit each buckling modes of the flanges. Considering these results, comparisons were made between the performance of the sinusoidal web profiles and those from the flat web profiles. The numerical results showed that the performance of a sinusoidal web profile can be up to 8% more efficient than flat soul profiles, regarding the possibility of collapse of the structure without the occurrence of FLB when subjected under compressive strength.

reec - revista eletrônica de engenharia civil

Estudo numérico da flambagem local na mesa em perfis de alma senoidal submetidos à compressão axial [Numerical study of the flange local buckling in sinusoidal web profiles under compressive strength]