Abstract
A series of investigations of the inelastic lateral buckling behaviour of steel beam–columns is described. These originate from many previous studies of the elastic lateral buckling of beams. It was found that present methods of predicting the effects of moment gradient in elastic beam–columns are unnecessarily conservative, and it was concluded that many practical continuous beam–columns will have significant warping restraints.Fourteen inelastic lateral buckling tests were carried out on 9 continuous steel beam–columns. The results of these tests were compared with predictions made by a new and improved finite element computer method of analyzing inelastic buckling, and very good agreement was found. The analytical method was then used to develop a simple approximation for predicting the inelastic buckling of isolated beam–columns with unequal end moments, and a design method was proposed. Key words: beams, buckling, columns, flexure, residual stresses, steel, structural design, structural engineering, torsion.
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