Analysis of cold formed structural rack columns.

Abstract

Este trabalho avalia a ocorr?ncia do modo de associado a flambagem local em pilares curtos constitu?das por perfis formados a frio tipo rack. Estes pilares possuem perfura??es para facilitar a montagem, e este trabalho considera a influ?ncia das mesmas no comportamento e no esfor?o resistente destes perfis estruturais. Os estudos foram realizados por an?lises num?ricas e experimentais, cujos resultados apresentaram boa correla??o e indicaram que as perfura??es n?o afetaram significativamente a carga cr?tica e a capacidade resistente dos pilares, apesar de influenciarem significativamente o comportamento dos mesmos, alterando o n?mero de meias ondas formadas. Observou-se ainda consider?vel influ?ncia das imperfei??es geom?tricas no comportamento da estrutura, indicando a necessidade de sua inclus?o nas an?lises num?ricas.This work presents an evaluation of local buckling in cold formed rack stub columns. These columns have perforations along their length to make assemblage easier, and this research investigates their influence in these structures behavior and resistance. Experimental end numerical analysis were carried out and their results showed good agreement and indicated that perforations in columns don't reduce significantly their buckling load and strength, but affect their buckling modes by changing the number of half waves formed in the columns . It was also observed a considerable influence of geometrical imperfections, indicating the need of their inclusion in the numerical analysis

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