Otimização estrutural de lajes formadas por vigotas treliçadas com e sem protensão

• Autor(a) principal: Ferreira, Tobias Ribeiro
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/14229; http://doi.org/10.14393/ufu.di.2016.238
• topic: Laje nervurada; Vigota treliçada; Protensão; Otimização; Lajes; Treliças (construção civil); Otimização estrutural; Ribbed slab; Lattice joist; Prestress; Optimization; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

This dissertation presents the study of one-way slabs formed by lattice joist with and without prestressing. The objective of this study is to compare the technical performance of each structural solution, taking into account the prestress competitiveness. For the slab design procedure and the optimization analysis, a routine is developed in an electronic spreadsheet. Some parameters such as loading, length between the axis, strength of concrete, steel area and prestressing force is considered in the analysis. The optimization process is carried out with two objectives. The first is to obtain a design whose final displacement is equal to the limit value prescribed by ABNT NBR 6118:2014. The second objective is to obtain the maximum vertical displacement that minimize the slab weight. The slab is considered simple supported and formed by individual beams. The results shows that the use of the lattice prestressed joists, to spans such as 6 m to 9 m, the average weight reduction of the slab is around 21% compared to not prestressed joists. It is concluded that, for the restrictions imposed in this study, the maximum span for the design of slabs with not prestressed joists is around 9 m, while for the prestressed situation the limit is around 15 m.