Unexpected reaction forces

[umut.akparlar]

Hi,

I'm designing a one-story building supported by piles. I need the reaction forces at the pin supports to design the piles individually.

When I select all the pinned supports under the building and open them in a new window, I can generate a reaction table specifically for those nodes using the SLS envelope.

There are no moments listed for any individual node, yet the "Sum of Reac." row still shows values under the Mxyz columns.

If every node shows zero moment, why does the "Sum of Reac." display moment values?

I’ve reviewed the Autodesk documentation (https://help.autodesk.com/view/RSAPRO/2026/ENU/?guid=GUID-E272460D-0B05-4F80-AF78-D6D9501131FA), but I’m not sure I fully understand the explanation.

Could you provide some input on this?

(Project file attached.)

Regards,

[Rafacascudo · Accepted solution]

The sum of moments (for the sum of reactions and the sum of forces) is determined with respect to the point with coordinates (0,0,0). The moments and forces operating at appropriate distances (arms) are taken into account, and recalculated with respect to coordinate point 0,0,0. 

That is clear  for me. For all load cases RSA gets all the applied loads and all reactions and calculates the 3 moments in relation to point 0,0,0 . It is just a check , both sums have to be of same value with contrary signs to the model be ok

And of course there is no moment reactions in the the pinned supports you created

[Simau]

Hi @umut.akparlar 

To illustrate what @Rafacascudo  said