Optimized reinforcement distribution in reinforced concrete structures under plane stress state.
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2022
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The strut-and-tie model is widely used for analysis and design of reinforced concrete structures. To apply this model, it is
necessary to defne strut-and-tie systems that represent the fow of stresses generated in the analyzed structure. In many situations, this strut-and-tie model is defned through an evolutionary structural optimization (ESO) considering linear isotropic
material. The results obtained from this model are not always satisfactory Query ID="Q1" Text="Please confrm the inserted
city name and country name in afliations 1 and 2 are correct and amend if necessary." because of the nonlinear behavior
of the concrete, mainly because of the great diference in the behavior under tension and compression. Because of this, an
evolutionary algorithm is developed in this article to defne the optimized reinforcement distribution in reinforced concrete
structures under plane stress state, considering the nonlinearity of the materials. This algorithm adopts the same principle as
the ESO algorithm; however, it does not eliminate the mesh element that discretizes the analyzed domain, but it eliminates
the reinforcement of the elements that do not meet an efciency criterion. A three-node triangular fnite element is used for
nonlinear analysis of the reinforced concrete structure under plane stress state. The structure domain is discretized by this
element, which can be of four types: with reinforcement in two fxed orthogonal directions, only in one direction, or without
reinforcement. During the evolutionary process of the algorithm using a rejection criterion based on the level of reinforcement
strain, the elements with reinforcement are changed to elements without reinforcement or with reinforcement in only one
direction. Three practical applications were evaluated to verify the efciency of the algorithm proposed in this article. Two
of them had their results compared with results provided in the literature, verifying the efciency of the proposed algorithm.
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Evolutionary structural optimization, Nonlinear analysis, Reinforced concrete, Plane stress state
Citação
SILVA, A. R. da; LADEIRA, A. H. Optimized reinforcement distribution in reinforced concrete structures under plane stress state. Structural and Multicisciplinary Optimization, v. 65, artigo 205, jul. 2022. Disponível em: <https://link.springer.com/article/10.1007/s00158-022-03273-2>. Acesso em: 15 mar. 2023.