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I used double members when entering members. Do I have to consider anything else or is it better to enter a member with double cross-section properties?

Answer

To design multi-part components, you can use the composite cross-sections of the cross-section library. In this case, the cross-section values are calculated automatically from the individual cross-sections and then also considered in the add-on modules for design. The shear-resistant connection of lattice members is shown here by entering an equivalent plate thickness t *.

Figure 03 - Combined cross-section

If you have edited the cross-section properties of a cross-section or the stiffnesses of a member with the "Modify Stiffness" function, they are generally not used in the design modules. The modified stiffnesses are only used for the calculation of internal forces.

Figure 01 - Stiffness modification in the calculation of internal forces

Figure 02 - Single angle with modification of stiffness

The designs in RF-/STEEL EC3 also require the exact dimensions and the shape of the cross-section for the c/t design or the selection of the interaction equation, for example. The effect of the stiffness modification on these individual parameters is not unique for all cases and thus cannot be used in the add-on module.

Figure 04 - Design ratio in RF-/STEEL EC3

Keywords

Modify stiffness Steel design Design Double members

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  • Updated 8 November 2020

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