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The torsional resistance of sections is calculated on the basis of a thin-walled closed section, even if the section is actually solid. For solid members, the section is idealized as a thin-walled section. There are several options for generation of thin -walled cross-section in SCIA Engineer, see "Equivalent thin-walled closed cross-section"
The effective wall thickness is calculated according to clause 6.3.2(1) in EN 1992-1-1
tef = A / u > 2 ∙ asl
where
| A | the total area of the cross-section within the outer circumference, including inner hollow areas |
| u | the outer circumference of the cross-section |
| asl | minimal distance between edge and centre of the longitudinal reinforcement. |
The important parameters for check of torsion calculated from the centre line of the effective thin-walled cross-section are: