Advanced Analysis of Steel Frame Structures Subjected to Lateral Torsional Buckling E

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Advanced Analysis of Steel Frame Structures Subjected to Lateral Torsional Buckling Effects

Author: Zeng Yuan | Size: 5.2 MB | Format: PDF | Quality: Unspecified | Year: 2004 | pages: 342

The current design procedure for steel frame structures is a two-step process including an elastic analysis to determine design actions and
a separate member capacity check. This design procedure is unable to trace the full range of load-deflection response and hence the failure modes of the frame structures can not be accurately predicted. In recent years, the development of advanced analysis methods has aimed at solving this
problem by combining the analysis and design tasks into one step. Application of the new advanced analysis methods permits a comprehensi
ve assessment of the actual failure modes and ultimate strengths of structural
steel systems in practical design situations. One of the advanced analysis methods, the refined plastic hinge method,has shown great potential to become a practical design tool. However, at present, it is only suitable for a special class of steel frame structures that is not subject to lateral
torsional buckling effects. The refined plastic hinge analysis can directly account for three types of frame failures, gradual formation of plastic hinges, column buckling and local buckling. However, this precludes most of the steel frame structures whose behaviour is governed by lateral torsional buckling. Therefore, the aim of this research is to develop a practical advanced analysis method suitable for general steel frame structures including the effects of lateral-torsional buckling.Lateral torsional buckling is a complex three dimensional instability phenomenon.Unlike the in-plane buckling of beam-columns, a closed form analytical solution is
not available for lateral torsional buckling. The member capacity equations used in design specifications are derived mainly from testing of simply supported beams. Further, there has been very limited research into the behaviour and design of steel frame structures subject to lateral torsional buckling failures. Therefore in order to incorporate lateral torsional buckling effects into an advanced analysis method, a detailed study must be carried out including inelastic beam buckling failures.

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