Web
When you perform nonlinear analysis and you are interested to investigate the local buckling results in the web, you need to define the imperfection for web panels. The beam web is divided by vertical stiffeners that make web panels. The panels are selected individually for imperfection shape and magnitude input.
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Globaal
When you perform nonlinear analysis and you are interested to investigate the global buckling results of a beam, like lateral torsional buckling, the imperfection must be defined for the zone of investigation. Here you define the buckling length zone (L), de vorm, and the magnitude of imperfection.
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From Buckling
The imperfection shape can be created based on the buckling shape that you obtained from the Linear Buckling Analysis results. In dit geval, after the analysis in the results panel you have to select the buckling mode (Result step), give the name to this shape, and click the ‘Set as imperfection’ button. Na dit, if you go to Imperfections > From buckling you will see the table row with the saved buckling shape. Then you can control the magnitude of the imperfection for the farther nonlinear analysis.
