# Rotational dof's release. "--\>Internal\<---" steel connection

**URL:** <https://calculix.discourse.group/t/rotational-dofs-release-internal-steel-connection/1916>\
**Category:** Uncategorized\
**Created:** [November 15, 2023, 10:09am UTC](https://calculix.discourse.group/t/rotational-dofs-release-internal-steel-connection/1916 "2023-11-15T10:09:21Z")\
**Posts on this page:** 1\
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**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [November 15, 2023, 1:14pm UTC](https://calculix.discourse.group/t/rotational-dofs-release-internal-steel-connection/1916/7 "2023-11-15T13:14:28Z")

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regarding rotational stiffness, it needed to use additional rigid arm similar case i has been discussed before. Fortunately, semi-rigid connection of both linear and nonlinear spring can be modeled.

> [@Torsional Spring - SPRING2?](https://calculix.discourse.group/t/torsional-spring-spring2/889/8):
>
> hi All, CalculiX only have translational springs, to modeling rotational spring some possibilities are shown in figure below. required eccentric two spring element (Kt) in the model and one additional nodes (red dot) connected by infinite stiff element or rigid body (gray line). best, [CCX\_Equivalent\_Rotational\_Spring]

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