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Inelastic lateral buckling of continuous steel beams
Highlights Yielding in steel beams varies with moment distribution and residual stresses. Yielding reduces effective in-plane and out-of-plane section rigidities. In-plane moment distribution in continuous beams is affected by reduced rigidities. Lateral buckling resistance is affected by moment distribution and reduced rigidities. Buckling prediction requires iterative numerical analysis.
Abstract The inelastic behaviour of a steel beam is complicated by reductions in the section rigidities which depend on the moment distribution and residual stress pattern. The inelastic beam is effectively tapered and mono-symmetric, and iterative numerical methods need generally to be used for the analysis. The in-plane moment distribution in an inelastic continuous beam lies between the commonly assumed rigid-plastic “plastic” path and a “yield” moment path. The yield path is the more critical for lateral buckling of the continuous beams considered in this paper. Approximations of the inelastic out-of-plane moduli of continuous beams developed from closed form lateral buckling solutions for simply supported beams in uniform bending can be used in a computer program for the buckling analysis of tapered mono-symmetric beams. Residual stresses cause significant reductions in the inelastic buckling resistance. The AISC design code predicts strengths which are similar in shape but significantly higher in magnitude than the inelastic buckling resistances of simply supported beams in uniform bending. The predictions for beams with central concentrated loads are much higher than the corresponding inelastic buckling resistances. Closer but still conservative approximations are obtained by using the method of design by inelastic buckling, which can also be used for continuous beams. This method is much simpler than those used to obtain accurate predictions.
Inelastic lateral buckling of continuous steel beams
Highlights Yielding in steel beams varies with moment distribution and residual stresses. Yielding reduces effective in-plane and out-of-plane section rigidities. In-plane moment distribution in continuous beams is affected by reduced rigidities. Lateral buckling resistance is affected by moment distribution and reduced rigidities. Buckling prediction requires iterative numerical analysis.
Abstract The inelastic behaviour of a steel beam is complicated by reductions in the section rigidities which depend on the moment distribution and residual stress pattern. The inelastic beam is effectively tapered and mono-symmetric, and iterative numerical methods need generally to be used for the analysis. The in-plane moment distribution in an inelastic continuous beam lies between the commonly assumed rigid-plastic “plastic” path and a “yield” moment path. The yield path is the more critical for lateral buckling of the continuous beams considered in this paper. Approximations of the inelastic out-of-plane moduli of continuous beams developed from closed form lateral buckling solutions for simply supported beams in uniform bending can be used in a computer program for the buckling analysis of tapered mono-symmetric beams. Residual stresses cause significant reductions in the inelastic buckling resistance. The AISC design code predicts strengths which are similar in shape but significantly higher in magnitude than the inelastic buckling resistances of simply supported beams in uniform bending. The predictions for beams with central concentrated loads are much higher than the corresponding inelastic buckling resistances. Closer but still conservative approximations are obtained by using the method of design by inelastic buckling, which can also be used for continuous beams. This method is much simpler than those used to obtain accurate predictions.
Inelastic lateral buckling of continuous steel beams
Trahair, N.S. (author)
Engineering Structures ; 190 ; 238-245
2019-04-07
8 pages
Article (Journal)
Electronic Resource
English
Buckling , Continuous beams , I-sections , Mono-symmetry , Residual stresses , Steel , Taper , Yield
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