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Why are the usability certificates in STAHL EC3 different for a combination of results (EC) from load cases (LF) and an OR combination of load combinations (LK)?


The deformations in the usability proof in STAHL EC3 are referenced by default to the displaced rod or rod set ends. This makes sense because you want to prove the local component.
See technical paper:

In the case of a result combination of load cases with the form LF1 / s + LF11 / s or up to LF31, a reference to the deformed system can lead to implausible results. The background to this is that the values of the displaced bar ends can come from independent load situations and thus a correct gauge can not be determined.

The figure shows the enveloping deformation of an EK of the type (LF1 / s + LF11 / s or to LF31). The deformed bar ends each come from different load cases. Here this was simulated for comparison with LK's. The stitch determined in the middle of the staff is not meaningful to evaluate.

One should work with load combinations in these cases.


Deformation Postponed Non Shapes Rod ends EK LK

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