Structural Engineering and Mechanics

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Curvature ductility of confined HSC beams

  • Bouzid Haytham (Department of Sciences and Technology, Tissemsilt University) ;
  • Idriss Rouaz (National Center of Studies and Integrated Research on Building Engineering (CNERIB)) ;
  • Sahnoune Ahmed (Department of Sciences and Technology, Tissemsilt University) ;
  • Benferhat Rabia (Laboratory of Geomatics and Sustainable Development, Tiaret University) ;
  • Tahar Hassaine Daouadji (Laboratory of Geomatics and Sustainable Development, Tiaret University)
  • Received : 2023.01.19
  • Accepted : 2024.03.19
  • Published : 2024.03.25
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Abstract

The present paper investigates the curvature ductility of confined reinforced concrete (RC) beams with normal (NSC) and high strength concrete (HSC). For the purpose of predicting the curvature ductility factor, an analytical model was developed based on the equilibrium of internal forces of confined concrete and reinforcement. In this context, the curvatures were calculated at first yielding of tension reinforcement and at ultimate when the confined concrete strain reaches the ultimate value. To best simulate the situation of confined RC beams in flexure, a modified version of an ancient confined concrete model was adopted for this study. In order to show the accuracy of the proposed model, an experimental database was collected from the literature. The statistical comparison between experimental and predicted results showed that the proposed model has a good performance. Then, the data generated from the validated theoretical model were used to train the artificial neural network (ANN) prediction model. The R2 values for theoretical and experimental results are equal to 0.98 and 0.95, respectively which proves the high performance of the ANN model. Finally, a parametric study was implemented to analyze the effect of different parameters on the curvature ductility factor using theoretical and ANN models. The results are similar to those extracted from experiments, where the concrete strength, the compression reinforcement ratio, the yield strength, and the volumetric ratio of transverse reinforcement have a positive effect. In contrast, the ratio and the yield strength of tension reinforcement have a negative effect.

Keywords

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