# How to Reading Reaction Forces on Fixed Places

**URL:** <https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387>\
**Category:** General Questions\
**Created:** [September 2, 2022, 6:48am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387 "2022-09-02T06:48:05Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![b.avci](https://avatars.discourse-cdn.com/v4/letter/b/f6c823/32.png) [@b.avci](https://prepomax.discourse.group/u/b.avci)\
**Post date:** [September 2, 2022, 6:48am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/1 "2022-09-02T06:48:05Z")

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Hi everyone,

How can i take a force reading from the places i fixed in my model? I want to see reaction forces on fixed places.

Thank you all.

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**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:** [September 2, 2022, 7:14am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/2 "2022-09-02T07:14:08Z")

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There are two ways to do this:

1. Use FORC field output and the Query → Surface tool to get the sum of reaction forces on the whole fixed face.
2. Request history output of the RF variable for a node set consisting of fixed nodes and set Totals to Yes.

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**Author:** ![Kuhl](https://avatars.discourse-cdn.com/v4/letter/k/e0b2c6/32.png) [@Kuhl](https://prepomax.discourse.group/u/Kuhl)\
**Post date:** [December 7, 2022, 7:59am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/3 "2022-12-07T07:59:55Z")

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Hi all,  
does anyone know why the history output (reaction forces) works for a node set that is connected by ridgid to a reference point which is constraint but not for the reference node itself? Is a reference node not supposed to be used for RF output?  
Thank you for any advice!

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/a0710dd9fe68ed0fdde420dccd481d0ec56b0f34.png)

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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:** [December 7, 2022, 10:07am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/4 "2022-12-07T10:07:20Z")

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It seems to be a limitation or bug in CalculiX - it works correctly with solid elements.

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**Author:** ![Kuhl](https://avatars.discourse-cdn.com/v4/letter/k/e0b2c6/32.png) [@Kuhl](https://prepomax.discourse.group/u/Kuhl)\
**Post date:** [December 7, 2022, 11:45am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/5 "2022-12-07T11:45:02Z")

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Thank you for the hint. Is there anything wront with using the node set for history output in you opinion?  
Thanks a lot!

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**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:** [December 7, 2022, 11:48am UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/6 "2022-12-07T11:48:07Z")

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No, as long as the output is correct which can be easily verified in this case.

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<div class="post-metadata">

**Author:** ![Kuhl](https://avatars.discourse-cdn.com/v4/letter/k/e0b2c6/32.png) [@Kuhl](https://prepomax.discourse.group/u/Kuhl)\
**Post date:** [December 7, 2022, 12:09pm UTC](https://prepomax.discourse.group/t/how-to-reading-reaction-forces-on-fixed-places/387/7 "2022-12-07T12:09:27Z")

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Perfect, thanks for the reply!