AVALIAÇÃO NUMÉRICA DA INFLUÊNCIA DO TIPO DE CARREGAMENTO NA LARGURA EFETIVA DE PONTES MISTAS DE AÇO E CONCRETO EM SEÇÃO CAIXÃO

Renato Nicoletti; Alexandre Rossi; Alex Sander Clemente de Souza; Carlos Humberto Martins

doi:10.4025/revtecnol.v29i2.52742

Renato Nicoletti Universidade Federal de São Carlos
Alexandre Rossi Universidade Federal de São Carlos
Alex Sander Clemente de Souza Universidade Federal de São Carlos
Carlos Humberto Martins Universidade Estadual de Maringá

DOI: https://doi.org/10.4025/revtecnol.v29i2.52742

Abstract

As vigas mistas de aço e concreto apresentam melhor rigidez, resistência e ductilidade comparadas às vigas de concreto armado e de aço. Entretanto, no que diz respeito à distribuição dos esforços, as tensões na laje de concreto não são uniformes, acarretando em seções não planas após o carregamento. Visto isso, para utilizar a hipótese das seções planas de Navier-Bernoulli, surge o conceito de largura efetiva. O trabalho em questão avaliou numericamente no software Abaqus® a influência do tipo de carregamento na largura efetiva de pontes mistas de aço e concreto em seção caixão. Mais especificamente, realizou-se uma análise paramétrica variando a geometria da seção mista e o vão longitudinal, para situações de carregamento distribuído uniformemente no tabuleiro e pontuais no meio do vão. A largura efetiva mostrou-se proporcional à altura da laje e ao comprimento de vão longitudinal. Quanto à forma de aplicação do carregamento, os modelos com carregamento distribuído apresentaram valores de largura efetiva superiores aos com carregamento pontual.

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