How can I enter the torsional rigidity (cross-section deformation) in the rotational restraint? I cannot find them anywhere in the program.

Answer

Cross-section deformations can be activated or deactivated in the parameters of members and sets of members (see Figure 01). The cross-section deformation is calculated according to EN 1993‑1‑1 as follows:

$\frac{\displaystyle1}{\displaystyle{\mathrm C}_{\vartheta,\mathrm k}}=\;\frac{\displaystyle1}{\displaystyle{\mathrm C}_{\mathrm{ϑR},\mathrm k}}\;+\;\frac{\displaystyle1}{\displaystyle{\mathrm C}_{\mathrm{ϑC},\mathrm k}}\;+\;\frac{\displaystyle1}{\displaystyle{\mathrm C}_{\mathrm{ϑD},\mathrm k}}$

After the calculation, the value is displayed in result tables (see Figure 02).

The information about calculating the value can be found in the relevant literature or in the manual for the RF-LTB add-on module.

Keywords

torsional rigidity cross-section deformation rotational restraint

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RFEM Steel and Aluminum Structures
RF-STEEL EC3 5.xx

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Design of steel members according to Eurocode 3

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STEEL EC3 8.xx

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Design of steel members according to Eurocode 3

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