LT buckling parameters
First part "LTB effect" of the window contains basic settings for the certain lateral torsional buckling direction. LT buckling verification can be switched of with the help of "Neglect LTB" setting. It's also possible to specify different basic sector length l1 for the calculation of LT buckling length.
The part "Beam and load type" contains several options for specifying the analysis parameters in accordance with table 6.1 of EN 1995-1-1 (end conditions and load position). The value of ratio between the effective length lef and the span l is selected according to these inputs. These options are available:
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The load position with respect to the centre of gravity ("on the top", "in the middle", "at the bottom") has to be specified in the most of cases. These options respect the note in table 6.1. The effective length lef is increased by 2h for the load applied at the compression edge and decreased by 0,5h for the load applied at the tension edge of the beam.
The values specified in the table 6.1 are valid only providing that the torsional rotation is prevented at member supports.
Window "Buckling parameters"