SOME ISSUES FOR COLUMN STABILITY CRITERIA

The strength and stability of columns have been the subjects of numerous studies since the original work of Euler in 1744 and 1759. Elastic buckling of perfectly straight columns was examined during the 19 th century, with landmark theories developed by Engesser and Considere. Several series of column tests were conducted to establish the correlation between theory and physical behavior. Research in the 20 th century examined the influence of material and member imperfections, including the tangent modulus study of Shanley. These efforts provided the resolution of the effects of material non-linearity, residual stress and out-of-straightness. The definitive solutions were developed in the 1970-s, when modeling and numerical procedures allowed all nonlinear effects to be included. Since that time reliability and probabilistic solutions have provided state-of-the-art limit states criteria for steel columns. Such approaches are now the bases for columns in all advanced design codes in the world.

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