An experimental investigation of 2 rectangular ducts has been performed in order to analyze the local buckling behavior of the side panels when subjected to various types of support and loading conditions. The experimental results were compared with numerical models based on the nonlinear finite element analysis. In addition, theoretical results were obtained using classical plate theory, and these were also compared with the experimental results. The good agreement between the experimental results and the analytical results has shown that both the theoretical closed-form equation and the nonlinear finite element method were capable of predicting the critical buckling behavior of the side panels in the rectangular duct. Furthermore, the results of this study have indicated that as the widths of the bottom support increased, the critical buckling load of the side panels in the rectangular duct also increased.
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