Steel and Composite Structures

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Soft computing-based estimation of ultimate axial load of rectangular concrete-filled steel tubes

  • Asteris, Panagiotis G. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Lemonis, Minas E. (Computational Mechanics Laboratory, School of Pedagogical and Technological Education) ;
  • Nguyen, Thuy-Anh (University of Transport Technology) ;
  • Le, Hiep Van (Institute of Research and Development, Duy Tan University) ;
  • Pham, Binh Thai (University of Transport Technology)
  • Received : 2021.01.19
  • Accepted : 2021.04.19
  • Published : 2021.05.25
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Abstract

In this study, we estimate the ultimate load of rectangular concrete-filled steel tubes (CFST) by developing a novel hybrid predictive model (ANN-BCMO) which is a combination of balancing composite motion optimization (BCMO) - a very new optimization technique and artificial neural network (ANN). For this aim, an experimental database consisting of 422 datasets is used for the development and validation of the ANN-BCMO model. Variables in the database are related with the geometrical characteristics of the structural members, and the mechanical properties of the constituent materials (steel and concrete). Validation of the hybrid ANN-BCMO model is carried out by applying standard statistical criteria such as root mean square error (RMSE), coefficient of determination (R2), and mean absolute error (MAE). In addition, the selection of appropriate values for parameters of the hybrid ANN-BCMO is conducted and its robustness is evaluated and compared with the conventional ANN techniques. The results reveal that the new hybrid ANN-BCMO model is a promising tool for prediction of the ultimate load of rectangular CFST, and prove the effective role of BCMO as a powerful algorithm in optimizing and improving the capability of the ANN predictor.

Keywords

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