Torsion (Beams: EC3 Eurocode)
Torsion design is carried out on request according to SCI P385, but only for single span, pin ended steel and cold formed beams with open and closed section types.
Auto design is not carried out in the current release, only check design (and check design is only carried out if the “check for torsion” flag is set to on in the Edit dialog or Properties Window).
Open sections (I- symmetric rolled)
A torsion design and an angle rotation check can be carried out for applied torsion forces only.
The following should be noted with regard to the torsion design:
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Axial force is not taken into account
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It is assumed that load is applied at the shear center. The effect of stabilizing/destabilizing loads is not considered.
Closed sections (HSS only)
An angle of rotation check can be carried out for applied forces only.
Angle of rotation check
The angle of rotation check is optionally carried out based on the applied torsion loading only.
The check is applied by selecting “Apply rotation limit” (located in the steel beam properties under the Torsion heading). The default limit is also set in the steel beam properties as 2° but can be adjusted to suit.