An experimental study of the local and overall buckling strength of centrally loaded cold-formed squard and rectangular steel columns is described. Cold-formed square or rectangular section steel columns may be expected to possess a high buckling strength because of the tempere and high quality of the steel irrespective of the normal steel grade, but local buckling of the component plates occurs in columns using plates of large width-thickness ratio. The strength characteristics of the local and overall column buckling are presented and the column design curve relating to the test data is discussed.
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