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The asymmetric initial post-buckling corresponding to the lowest bifurcation load andthe imperfection sensitivity are analysed in detail for a compressed simply supported column with anequilateral triangular cross-section in the plastic range.The effect of elastic unloading is taken into ac-count in the analysis.The asymptotic relations,including high order terms,among the load,the am-plitude of imperfection and the amplitude of the bifurcation mode are realized.The results show thatthe maximum supported load is very sensitive to imperfection.
The asymmetric initial post-buckling corresponding to the lowest bifurcation load and the imperfection sensitivity are analyzed in detail for a compressed simply supported column with anequilateral triangular cross-section in the plastic range. The effect of elastic unloading is taken into ac-count in the analysis The asymptotic relations, including high order terms, among the load, the am-plitude of imperfection and the amplitude of the bifurcation mode are realized.The results show that the maximum supported load is very sensitive to imperfection.