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

Answer

The maximum support force of an RC is zero because the included load combinations are defined as Variable (potentially). Since all support forces of these LCs have a negative sign, the resulting RC has only a negative value. Thus, the other value is zero because no LC may be 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 = LC1/permanent or LC2/permanent or LC3/permanent.

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

Keywords

Result combination RC Support force Support forces Criterion Permanent Variable

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