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In the RF- / STEEL EC3 add-on module, I have selected two braids of equal size for one beam to be designed in the "Parameters" window as the shear panel type. Accordingly, the beam should be supported laterally in the middle. Why is the eigenvector arbitrary?

Answer

The term "shear panel" indicates that the translational spring, which is created along the beam length by means of the shear panel type including the corresponding parameters, is smoothed, see Figure 1.

Figure 01 - Shear panel

This is also the case for the shear panel type "Bracing", so that the mode shape always appears to be arbitrary at this location, see Figure 2.

Figure 02 - Mode Shear panel

In order to obtain accurate results, it is recommended to manually define a lateral support by means of a nodal support according to the general method (Figure 3) or to define the effective lengths according to the equivalent member method, including intermediate restraints, if necessary. Finally, a eigenvector with visible lateral restraint in the mid-span is created (Figure 4).

Figure 03 - Lateral support according to the general method

Figure 04 - Mode shape with lateral support in the mid-span by general method

Keywords

Shear panel bracing Lateral support Eigenvector

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

Add-on Module

Design of steel members according to Eurocode 3

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RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

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Design of steel members according to Eurocode 3

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