On transferring a beam from Diamonds to ConCrete Plus, the message appears

*[NL]: Controleer of de horizontale benen in staat zijn om de krachtswerking te weerstaan*

*[FR]: Vérifier la résistance des barres horizontales des cadres.*

## Solution

In Diamonds, beams can be loaded both in and out of the plane. This results in shear forces V_{z’} and V_{y’}.

- To resist to the shear force V
_{z’}, the reinforcement quantity A_{wz}is calculated. This corresponds with the**vertical legs**of the stirrups. - To resist to the shear force V
_{y’}, the reinforcement quantity A_{wy}is calculated. This corresponds with the**horizontal legs**of the stirrups.

Beams in ConCrete (Plus) an only be loaded in the plane resulting in V_{z’, } A_{wz }and an reinforcement amount of the vertical legs of the stirrups. Because a stirrup is always a closed shape, ConCrete (Plus) will extent the outer vertical legs of the stirrups to two horizontal legs. Resulting in A_{wy.}

If you open a Diamonds beam with both loads in and out of the plane, ConCrete Plus will not verify if the assumed A_{wy }is suffient to bear the shear forces out of the plane V_{y} (because ConCrete Plus is 1D). Thus ConCrete Plus will give the message above to warn you.

Example:

- Diamonds calculated A
_{wz }= 500 mm²/m. For a two-legged ⌀8 stirrup, the vertical legs have an area of 100mm²/stirrup. So you need 5 stirrups per meter to meet A_{wz }= 500 mm²/m. - ConCrete Plus understands what A
_{wz}represents, and can verify the 500 mm²/m to 5 stirrups ⌀8 per meter. - Diamonds also calculated that A
_{wy }= 700 mm²/m. ConCrete Plus**cannot**verifry A_{wy}represents. You should see that the are of the horizontal legs of 5 stirrups ⌀8 per meter are not sufficient to meet the requirement A_{wy }= 700 mm²/m. Either you increase the stirrup diameter (or the distance) until the A_{wy }= 700 mm²/m is met.