Abstract
The paper presents the behaviour and the elastic buckling loads of I-section steel columns with various web hole shapes. The behaviour of such steel columns is analysed according to two direction axes including the actual axis (y-y) and the virtual axis (x-x). Based on the behaviour of the I-section steel columns in two axes, the elastic buckling loads are formulated. It is found that the elastic buckling loads of the I-section columns with perforations in the virtual axis are determined with the consideration of shear action effects. Also, the elastic buckling loads of such columns depend on the shapes and dimensions of the web holes as well as the distances between these holes.
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