FAQ 000081 EN

1 December 2017

Robert Vogl Calculation RFEM RSTAB

For support forces of a result combination, the maximum component is equal to zero. This cannot be true. The minimum force is alright.

Answer

The maximum support force of a RC is zero because the load combinations included in the combination are defined as Variable (potentially). Since all support forces of these LCs have the negative sign, the resulting RC has only a negative value. Thus, the other value is zero because it is possible that no LC is acting (therefore 'potentially'). Zero as a maximum is greater than any negative value.

To solve this problem, you have to define the load combinations included in the RC as Permanent:
RC1 = RC1/permanent or RC2/permanent or RC3/permanent.

In this way, the load combinations 1 to 3 will be compared. The most unfavourable value always gives the minimum and the maximum result.

Keywords

result combination RC support force support forces criterion permanent variable

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