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Why are the serviceability limit state designs in STEEL EC3 different for a result combination (RC) from load cases (LC) and an OR result combination from load combinations (CO)?

Answer

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: https://www.dlubal.com/support-and-training/support/knowledge-base/001081

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.

Keywords

Deformation Moved Undeformed Member Ends RC CO

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