Slab Punching Calculation note

[EY23]

Hello All,

Could anyone kindly explain the orientation of Mscx and Mscy in the punching results note?

I’ve attached some examples where you can see the differences in the results. From what I understand, Mscx corresponds to the moment about the local slab axis aligned with the column, and similarly for Mscy. However, the sign convention (+/–) is confusing.

I noticed that when the slab axis has the same orientation as the column axis, the result is positive, and vice versa. Nevertheless, if you compare Case 3 and Case 4, the applied moment behaves differently: in one case it is clockwise, while in the other it is counterclockwise.

Your help is much appreciated 

[EY23]

Any Support?

[Simau]

Hi @EY23 

Could you Zip and share your model 

[EY23]

Thank you for your reply. I have attached the model.

[Simau · Accepted solution]

Hi @EY23 

When using Eurocode instead of ACI, moments are displaying without sign.

This is not the right place to analyse moments sign.

Use Maps instead, you'll see that columns local axis have no influence on panels moments sign

[Ira_Alexandrovsky]

What does alpha mean in EC2?

[Simau]

Alpha is the angle of the punching shear reinforcement with the plane of the slab.