1697x
003562
2021-06-09

Arbitrary Mode Shape Despite Shear Panel Type in RF-/STEEL EC3

In the RF‑/STEEL EC3 add-on module for RFEM 5 / RSTAB 8, 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 does the mode shape not meet expectations?


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.

A continuously distributed spring is therefore applied over the entire member length, which is calculated from the parameters of the bracing.

This is sufficiently accurate for bracing with narrow post spacing.

In order to obtain the exact results in the case of larger post spacing, we recommend manually defining the lateral support using a nodal support according to the general method or defining 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.


Author

Mr. Faulstich is responsible for the quality assurance of the RFEM program and provides customer support.

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