# 2D plane stress can't get Reaction Forces/Moments from A Reference point

**URL:** <https://prepomax.discourse.group/t/2d-plane-stress-cant-get-reaction-forces-moments-from-a-reference-point/3600>\
**Category:** General Questions\
**Tags:** results\
**Created:** [August 11, 2026, 10:46am UTC](https://prepomax.discourse.group/t/2d-plane-stress-cant-get-reaction-forces-moments-from-a-reference-point/3600 "2026-08-11T10:46:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Claudio](https://avatars.discourse-cdn.com/v4/letter/c/7cd45c/32.png) [@Claudio](https://prepomax.discourse.group/u/Claudio)\
**Post date:** [August 11, 2026, 10:46am UTC](https://prepomax.discourse.group/t/2d-plane-stress-cant-get-reaction-forces-moments-from-a-reference-point/3600/1 "2026-08-11T10:46:33Z")

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Hello watch desinger here, im quite new to Prepomax and i’m struggling to get Moment reactions from the reference point

I’m trying to get the reaction moment from the pin rotation around de reference point but in the results I only get 0.

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/3/3500d7e4de7b7cee2c06f8f9c3451cb42ae11daa.png)

Here’s my Setup:

2D Plane stress with CPS6 and CPS8 element types

Reference point + Rigid body with the pin

**STEP 1**  
BC’s  
Displacement of the spring to pre-load the pin  
U1= -0.15mm  
U2 = 0 mm  
UR3 = Unconstrained  
Reference point displacement at 0’s

**STEP 2**  
BC’s  
Displacement of the spring to pre-load the pin  
U1 = 0 mm  
U2 = 0 mm  
UR3 = Unconstrained

Reference point displacement  
U1 = 0 mm  
U2 = 0 mm  
UR3 = 0.2552 rad

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/5/5747d032ee90e8feccfa029c01ee43fef4a166c4.png)

I dont get it why i can’t get reactions forces or moments.  
Is there something wrong in my simulation?

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<div class="post-metadata">

**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [August 11, 2026, 10:49am UTC](https://prepomax.discourse.group/t/2d-plane-stress-cant-get-reaction-forces-moments-from-a-reference-point/3600/2 "2026-08-11T10:49:52Z")

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This seems to be number 11 from the [known CalculiX limitations list](https://prepomax.discourse.group/t/known-calculix-limitations/3050). Check the referenced ccx forum thread and maybe post there: [Zero reaction moment when reading from ROT NODE in 2D - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).](https://calculix.discourse.group/t/zero-reaction-moment-when-reading-from-rot-node-in-2d/1312)

Of course, reaction forces/moments will appear only in nodes and DOFs with boundary conditions (zero or non-zero) applied. However, RF in CalculiX also includes the applied point loads.

Try with equivalent 3D solid model instead.