Buckling Characteristics of High Manganese Non-magnetic Steel and Carbon Steel Hybrid Cruciform Columns : Investigation for Applying Dissimilar Materials to Steel Structures (Report III)(Mechanics, Strength & Structure Design)

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The validity of the results obtained by elastic-plastic large deformation analysis is confirmed by comparing load-displacement curves obtained in experiments using the central axis compression test. A series of analyses were performed in order to elucidate the buckling characteristics of dissimilar materials hybrid columns. The local buckling mode of dissimilar materials hybrid columns (DMHC columns) is same as that of similar materials columns (SMC columns), but the overall buckling mode is different from that of SMC columns. The vertical displacement-load history of DMHC columns follows a history between those of SMC columns assembled from each material regardless of width-thickness ratio in the elastic range, but shows a peculiar behavior beyond the yield point. After reaching the maximum load, it follows a history between those of SMC columns again. Paying attention to the panels, although each panel of the DMHC column shows the same behavior as that of a panel of an SMC column in the elastic range, after yielding, each panel of the DMHC column shows a different progress of plasticity. It is found that the maximum load of a DMHC column might become smaller than that of an SMC column assembled from material in which the maximum load was smaller and its conditions are elucidated.
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