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International Journal of Steel Structures

09-09-2019

Artificial Neural Networks (ANN) Based Compressive Strength Prediction of AFRP Strengthened Steel Tube

Published in: International Journal of Steel Structures

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Abstract

The use of FRP composites as external confinement has recently become a very important system to consider when reinforcing concrete and steel structures. Many constitutive models have been proposed to design such structures. However, the emergence of artificial neural network offers a better alternative with a strong prediction capability. In this research, an artificial neural network (ANN) based model is used to estimate the compressive strength, maximum stresses and strains of AFRP strengthened circular hollow section steel tubes under axial compression. A database of 129 cases of finite element model (FEM) was analyzed using ANSYS Workbench 19.0 and ACP Tool. The FEM was validated with a previously done experimental test. Different geometric criteria have been taken into account to better address the complexity of the problem. Using this FEM database, ANNs have been trained using two approaches. The first approach was using the neural network toolbox in MATLAB. The second approach was using a built-in neural network tool in ANSYS Workbench. The successfully trained ANN is further used to predict the new cases, as an alternative to FE Analysis. Following, a parametric study and a sensitivity analysis were also carried out to investigate the effect of different parameters on the load capacity. The predicted results of the ANN models show a good correlation with the experimental and FEM results. Moreover, comparative analysis of performance result reveals that the ANSYS-ANN had better accuracy in terms of mean squared error and regression value (R²) compared to MATLAB-ANN. The ANN is quite an efficient tool in determining the strength of the AFRP strengthening steel tubes. Such a technique can be used to reduce computation time and labor.

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Title: Artificial Neural Networks (ANN) Based Compressive Strength Prediction of AFRP Strengthened Steel Tube
Publication date: 09-09-2019
Published in: International Journal of Steel Structures
Print ISSN: 1598-2351
Electronic ISSN: 2093-6311
DOI: https://doi.org/10.1007/s13296-019-00276-6