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• Comparative Analysis of Slender Columns by Approximate Methods

  L. ARAUJO

  Análise comparativa dos Métodos Aproximados de Dimensionamento de Pilares Esbeltos de Concreto (2018). ARAUJO, L, J.; Dos Santos ; BARBOSA, W. C. S. . ANÁLISE COMPARATIVA DOS MÉTODOS APROXIMADOS DE DIMENSIONAMENTO DE PILARES ESBELTOS DE CONCRETO. In: 60º Congresso Brasileiro do Concreto, 2018, Foz do Iguaçu. 60º Congresso Brasileiro do Concreto, 2018.

  
  

  Abstract

  The present work seeks to analyze the simplified procedures described in ABNT NBR 6118: 2014 for the design of slender columns of reinforced concrete. The standard presents the "Standard abutment method with approximate curvature" and "Standard abutment method with rough stiffness", which is intended for columns with slenderness> 90. The comparative studies of these methods found in the literature have divergent conclusions when it comes to choosing which method best fits the experimental results. Also discussed are proposals for improvements to methods for simplifying the sizing process. Finally, the authors present their conclusions about the methods studied.

  Abstract
  The present work seeks to analyze the simplified procedures described in ABNT NBR 6118: 2014 for the design of slender columns of reinforced concrete. The standard presents [...]

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• Optimization Study For The Cross-Section Of A Concrete Gravity Dam: Genetic Algorithm Model And Application.

  L. ARAUJO, A. Vieira, D. Gutstein

  Rev. int. métodos numér. cálc. diseño ing. (2019). Vol. 35, (3), 35

  
  

  Abstract

  Concrete gravity dams have trapezoidal shape in their cross section and shall guarantee the global stability against acting loads like hydrostatic and uplift pressures through his gravitational actions (self-weight and others). This study focuses on the shape optimization of concrete gravity dams using genetic algorithms. In this case, the dam cross section area is considered as the objective function and the design variables are the geometric parameters of the gravity dam. The optimum cross-section of a concrete gravity dam is achieved by the Genetic Algorithm (GA) through a Matlab routine developed by the author. Sliding, overturning and floating verifications are implemented in the program. In order to assess the efficiency of the proposed methodology for gravity dams optimization, one application is presented adopting the concrete gravity dam of Belo Monte Hydropower Plant (HPP), considering normal loading condition and others assumptions presented.

  Abstract
  Concrete gravity dams have trapezoidal shape in their cross section and shall guarantee the global stability against acting loads like hydrostatic and uplift pressures through [...]

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• CROSS-SECTION OPTIMIZATION OF CONCRETE GRAVITY DAMS USING GENETIC ALGORITHMS

  L. ARAUJO

  CROSS-SECTION OPTIMIZATION OF CONCRETE GRAVITY DAMS USING GENETIC ALGORITHMS (2017). XXXVIII Ibero-Latin American Congress on Computational Methods in Engineering

  
  

  Abstract

  Concrete gravity dams are the most commonly used hydraulic structures in engineering, for the designer these structures, the overall stability (external forces) must be guaranteed as well as the internal stresses that element is subjected to. The scaling mechanisms these structures are presented in the manual Critérios de Projeto Civil de Usinas Hidroelétricas (2003) from Eletrobras, which is strongly influenced by the U.S. Bureau of Reclamation (1976). After an analysis of the proposed design forms, it was observed a tendency to oversize these structures, in order to reduce this oversizing and to obtain slender forms of dam, the present work brings an optimization study for the cross sections of concrete gravity dams, this optimization will be made by means of routines used in Matlab software, the genetic algorithm technique will be used to reduce the cross-section of this type of dam and consequently reduce the volume of concrete used in its construction.

  Abstract
  Concrete gravity dams are the most commonly used hydraulic structures in engineering, for the designer these structures, the overall stability (external forces) must be guaranteed [...]

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