Design of tapered structural member with Class 4 cross-section
The global stability analysis of irregular structural members (for example tapered beam-columns) may be performed by the general method specified in EN 1993-1-1 (6.3.4). The method is based on the calculation of the design load amplifier and the critical load amplifier. The design load amplifier is related to the resistance of the critical (most loaded) cross-section, while the critical load amplifier is related to the elastic global stability of the structure.
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Effect of lateral support of the compression flange on the stability of beam-columns
Lateral supports of the compression flange of beam-columns (or frames) may drastically increase the critical load amplifier. Higher critical load amplifier normally leads to higher global stability resistance. The ConSteel program provides easily used finite element method to calculate the critical load amplifier of structural members and frames with simple or more complicated supporting system.
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Global stability analysis using general method
The main point of the method is the stability analysis, which should contain the lateral torsional buckling mode, and which is usually performed by finite element method. This method assumes that the whole structure has a unified slenderness. The method uses the buckling curves which are used for the flexural and the lateral torsional buckling modes.
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Global stability analysis using overall imperfection method
The global stability analysis of steel structural members or frames may be performed by examination of the resistance of cross-sections. In this method the design forces should be calculated by second order stress analysis and the geometry of the model should be modified by global (initial sway) and local (initial bow) imperfections.
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