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FAQ 004200 EN

8 November 2019

Thomas Günthel Results RFEM RSTAB

Why are there no resultant support forces for result combinations?

Answer

For a resultant, a concrete combination of loads is required, which result combinations can not provide.

The following example shows the problem quickly. A single-span beam is loaded with three different load cases. For the support at node 1, the result envelope of the 6 possible load combinations results in a maximum PZ of 11.25 kN from the result of CO 2 (see Figure 01). The support at node 2 has a maximum PZ of 12 kN from the result of CO1. However, the resultant of 23.25 kN does not occur in any of the involved load combinations and is therefore too large (maximum CO 1 and CO 2 with 22.5 kN).

The situation is similar with the pure result combination from the load cases, which have the same maximum values PZ of the nodal supports 1 and 2. However, it is not apparent here that a resultant would give incorrect results.

For result combinations, resultants are not used for result combinations because the results may be incorrect.

Keywords

Resultant Result combination

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