INVESTIGAÇÃO DA FLAMBAGEM LATERAL COM DISTORÇÃO EM VIGAS MISTAS DE AÇO E CONCRETO COM LAJES ALVEOLARES
Palavras-chave:
Vigas mistas de aço e concreto, Momento fletor negativo, Flambagem lateral com distorção.Resumo
As estruturas mistas têm como principal atrativo a capacidade de explorar as melhores características dos materiais aço e concreto. Essas estruturas apresentam um excelente desempenho estrutural, precisão geométrica e baixíssimo desperdício em obra. Além disso, a utilização de vigas mistas de aço e concreto com lajes alveolares pré-fabricadas favorece o processo de industrialização do setor da construção civil, além de possibilitar maior agilidade na execução e diminuição drástica da quantidade de entulho gerado em obra. Quando as vigas mistas de aço e concreto são solicitadas a momento fletor negativo, em regiões de continuidade, a laje de concreto se encontra tracionada e o perfil de aço comprimido, situação não ideal na utilização de vigas mistas de aço e concreto. Assim, o perfil de aço está sujeito a fenômenos de estabilidade. Dentre os modos de estabilidade que são verificados no perfil de aço tem-se a Flambagem Lateral com Distorção (FLD), a Flambagem Local da Mesa (FLM) e a Flambagem Local da Alma (FLA). Se tratando da FLD, os procedimentos normativos e os trabalhos presentes na literatura mostram que esse fenômeno ainda não se encontra totalmente esclarecido. Além disso, nenhuma investigação foi desenvolvida considerando-se a utilização de lajes alveolares pré-fabricadas. Nesse contexto, com o objetivo de investigar esse fenômeno, esse trabalho apresenta um estudo numérico, desenvolvido com o software ABAQUS, em vigas mistas com lajes alveolares sob ação de momento fletor negativo. Os resultados foram comparados com procedimentos analítico. Verificou-se situação conservadora para todos os procedimentos estudados.Downloads
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