Análise da estabilidade lateral de uma viga pré-moldada de concreto para ponte em fases transitórias
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Data
2019-06
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Ricardo Prado Abreu Reis
Resumo
Concrete structures, generally, do not present lateral instability problems. However, the transitory phases become a critical state for precast beams, since in these cases the temporary supports do not restrict the rotation and torsion in the elements, as in the definitive phases. As a result of this degree of liberty, the pieces may lose their equilibrium and shift laterally. Instability studies may be restricted to two main situations: the hanging element and the element over the elastic support. Given that normative recommendations, in general, have very simplistic safety parameters, in this paper, one design of a precast concrete beam is taken and its safety against lateral instability is evaluated according to two methods, one based on the equilibrium of forces in the rotated beam and the other on the determination of its critical load of lateral instability. These methods are compatibilized to the Brazilian standard indications and reevaluated. A sensitivity analysis is added to determine which variables have the greatest influence on the safety factors proposed by the methods. It is found that the safety indicators are reduced when compatibilization to national normatives is applied. Through the sensitivity analysis, it is noted that the use of overhangs during the transitory phases improves the safety levels.
Descrição
Palavras-chave
Instabilidade lateral, Vigas de concreto protendido, Fases transitórias, Análise de sensibilidade, Parâmetros de segurança, Lateral instability, Precast concrete beams, Transitory phase, Sensitivity analysis, Safety factors
Citação
BORGHI, Graziela Borges; LISBOA, Guilherme de Paula; ARAÚJO, Daniel de Lima. Análise da estabilidade lateral de uma viga pré-moldada de concreto para ponte em fases transitórias. Revista Eletrônica de Engenharia Civil, Goiânia, v. 15, n. 1, p. 151-167, jan./jun. 2019. Disponível em: <https://www.revistas.ufg.br/reec/article/view/49640/pdf>.