Computers and Concrete

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Topological optimization procedure considering nonlinear material behavior for reinforced concrete designs

  • Franca, Marcela Bruna Braga (PROPEEs-Programa de Pos-Graduacao em Engenharia de Estruturas da UFMG, Departamento de Engenharia de Estruturas, Universidade Federal de Minas Gerais) ;
  • Greco, Marcelo (PROPEEs-Programa de Pos-Graduacao em Engenharia de Estruturas da UFMG, Departamento de Engenharia de Estruturas, Universidade Federal de Minas Gerais) ;
  • Lanes, Ricardo Morais (PROPEEs-Programa de Pos-Graduacao em Engenharia de Estruturas da UFMG, Departamento de Engenharia de Estruturas, Universidade Federal de Minas Gerais) ;
  • Almeida, Valerio Silva (EPUSP, Departamento de Engenharia de Estruturas e Fundacao da Escola Politecnica, Universidade de Sao Paulo)
  • Received : 2014.12.23
  • Accepted : 2016.01.20
  • Published : 2016.01.25
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Abstract

The search for new structural systems capable of associating performance and safety requires deeper knowledge regarding the mechanical behavior of structures subject to different loading conditions. The Strut-and-Tie Model is commonly used to structurally designing some reinforced concrete elements and for the regions where geometrical modifications and stress concentrations are observed, called "regions D". This method allows a better structural behavior representation for strength mechanisms in the concrete structures. Nonetheless, the topological model choice depends on the designer's experience regarding compatibility between internal flux of loads, geometry and boundary/initial conditions. Thus, there is some difficulty in its applications, once the model conception presents some uncertainty. In this context, the present work aims to apply the Strut-and-Tie Model to nonlinear structural elements together with a topological optimization method. The topological optimization method adopted considers the progressive stiffness reduction of finite elements with low stress values. The analyses performed could help the structural designer to better understand structural conceptions, guaranteeing the safety and the reliability in the solution of complex problems involving structural concrete.

Keywords

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