Numerical Calculation of Flexural Buckling Capacities of Aluminum Structural with Irregular-shaped Thin-walled Cross Section
Since irregular-shaped thin-walled aluminum alloy sections are prone to distortional buck-ling when subjected to bending,the analysis results of the critical bending moments of 12 irregular-shaped thin-walled section beams with different calculated lengths were compared using the effective thickness analytical method and the modal analysis numerical method.Then,using the direct strength method in the American standard,14 thin-walled irregular-shaped sections with the same calculated length and different thicknesses were used to analyze the effects of different plate width-to-thickness ratios on the local buckling and distortional buckling capacity of irregular-shaped section beams.The calculation results of the eigenvalue method and the FSM finite strip method are essentially the same.It is necessary to accurately determine the local buckling and distortion buckling modes and calculate the corresponding critical bending moments of low-order buckling and high-order buckling.The ei-genvalue method is a simple method for solving thin-walled irregular-shaped cross-section members of aluminum alloy structures,has wide applicability,clear modal analysis results and can obtain rela-tively accurate results,and can be used as a supplementary calculation to the standard analytical meth-od.
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