Abstract
A new method is presented for analyzing the interaction between local and overall instability of thin-walled open polygonal section members. Based on beam theory approximations, non-linear expressions for displacements are first derived taking the distortion of cross section into account, and then the governing equations for instability of members are developed. Buckling loads for I-section beam and hat-section column are analyzed as examples, and the accuracy of the method is discussed by comparing some solutions with those obtained using the more complex method based on plate theory. The method makes it possible to predict the local through distortional to lateral instability of members using a small number of degrees of freedom.
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