Computers and Concrete

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Development of an analytical method for optimum design of reinforced concrete beams considering both flexural and shear effects

  • Zivari, Ahmad (Department of Civil Engineering, Shahed University) ;
  • Habibi, Alireza (Department of Civil Engineering, Shahed University) ;
  • Khaledy, Nima (Department of Civil Engineering, Najafabad Branch, Islamic Azad University)
  • Received : 2018.08.18
  • Accepted : 2019.06.04
  • Published : 2019.08.25
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Abstract

Optimization is an important subject which is widely used in engineering problems. In this paper, an analytical method is developed for optimum design of reinforced concrete beams considering both flexural and shear effects. A closed-form formulation is derived for optimal height and rebar of beams. The total material cost of steel and concrete is considered as the objective function which is minimized during the optimization process. The ultimate flexural and shear capacities of the beam are considered as the main constraints. The ultimate limit state is considered for deriving the relations for flexural capacity of the beam. The design requirements are considered according to the item 9 of the Iranian National Building. Analytical formulas and some curves are proposed to be used for optimum design of RC beams. The proposed method can be used to perform the optimization of RC beams without the need of any prior knowledge in optimization. Also, the results of the studied numerical example show that the proposed method results in a better design comparing with the other methods.

Keywords

References

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