In the RF‑/STEEL EC3 add-on module, I have selected two bracings with the same size as the shear panel type in the "Parameters" window for a beam to be designed. Thus, the beam should be supported laterally in the middle. Why is the eigenvector arbitrary anyhow?

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 01.

Figure 01 - Shear Panel

This is also the case of the "Bracing" shear panel type, so that the mode shape always seems to be arbitrary at this location, see Figure 02.

Figure 02 - Mode Shape Shear Panel

In order to obtain the exact results, it is recommended to manually define the lateral support by using a nodal support according to the general method (Figure 03) or to define the effective lengths according to the equivalent member method, including intermediate lateral restraints, if necessary. Thus, a mode shape with the visible lateral restraint is created in the mid-span (Figure 04).

Figure 03 - Lateral Support According to General Method

Figure 04 - Mode Shape with Lateral Support in Mid-span According to General Method

Keywords

Shear panel Bracing Lateral restraint Mode shape

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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

Price of First License
1,480.00 USD
RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD