# RelConnectsRigidMember

## Rigid Member

A rigid connection between two entities. Rigid Member allows to create connections between nodes ([StructuralPoinConnection](https://gitbook.saf.guide/structural-analysis-elements/structuralpointconnection#node)), 1D members ([StructuralCurveMember](https://gitbook.saf.guide/structural-analysis-elements/structuralcurvemember#1d-member-beam-column)) and edges of 2D members ([StructuralSurfaceMember](https://gitbook.saf.guide/structural-analysis-elements/structuralsurfacemember#2d-member-plate-wall)). Connection could be infinitely rigid or with user defined properties. Maximum of two entities could be connected with one **RelConnectsRigidMember**.

![](https://2984879901-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FP3f3I86mz7TGPX0pWLAB%2Fuploads%2Fgit-blob-73bf0f611ca7836b0aab2b6c04ca608a98a7bb11%2F27_structuralrigidmember.jpg?alt=media)

### Specification in the excel

| Name of the column header  | Type of data |                                                                               Value example or enum definition                                                                               | Required value                                                                                        | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| -------------------------- | ------------ | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | ----------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Name                       | String       |                                                                                              RM1                                                                                             | yes                                                                                                   | Human readable unique name of the object                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Node                       | String       |                                                                                              N3                                                                                              | <p>yes</p><p>,if is connection between node and other entity is desired</p><p>otherwise no</p>        | <p>The name of the valid existing node (<a href="../../structural-analysis-elements/structuralpointconnection#node">StructuralPoinConnection</a>)</p><p>Fiil in node indication, when connection between node, 2D member edge, 1D member or internal edge is desired</p>                                                                                                                                                                                                             |
| 2D Members                 | String       |                                                                                            S1; S2                                                                                            | <p>yes</p><p>,if connection between 2D member edge and other entity is desired</p><p>otherwise no</p> | <p>The name of the valid existing 2D member (<a href="../../structural-analysis-elements/structuralsurfacemember#2d-member-plate-wall">StructuralSurfaceMember</a>)</p><p>Maximum of two 2D members can be connected by RelConnectsRigitMember</p><p>Fiil in one 2D member indication, when connection with node, 1D member or internal edge is desired</p>                                                                                                                          |
| Edges                      | String       |                                                                                             3; 1                                                                                             | <p>yes</p><p>,if column "2D Members" is filled</p><p>otherwise no</p>                                 | <p>This attribute defines edges that should be connected with RelConnectsRigidMember</p><p>One value for every value set in column "2D Member"</p><p>The index starting with 1.</p><p>The order is according to order of “edges” property at <a href="../../structural-analysis-elements/structuralsurfacemember#2d-member-plate-wall">StructuralSurfaceMember</a></p>                                                                                                               |
| Internal edge              | String       |                                                                                           IE2; IE6                                                                                           | <p>yes</p><p>,if connection between internal edges and other entity is desired</p><p>otherwise no</p> | <p>The name of the valid existing internal edge (<a href="../../structural-analysis-elements/structuralcurveedge#internal-edge">StructuralCurveEdge</a>)</p><p>Maximum of two internal edges can be connected by RelConnectsRigitMember</p><p>Fiil in one internal edge indication, when connection with node, 1D member or 2D member edge is desired</p>                                                                                                                            |
| 1D Members                 | String       |                                                                                            B1; B3                                                                                            | <p>yes</p><p>,if connection between 1D member and other entity is desired</p><p>otherwise no</p>      | <p>The name of valid existing 1D member (<a href="../../structural-analysis-elements/structuralcurvemember#1d-member-beam-column">StructuralCurveMember</a>)</p><p>Maximum of two 1D members can be sonnected by StrucutralRigidMember</p><p>Fill in one 1D member indication, when connection with node, 2D member edge or internal edge is desired</p>                                                                                                                             |
| Type                       | Enum         |                                                                                   <p>Fixed</p><p>Custom</p>                                                                                  | yes                                                                                                   | <p>Constraint of the Rigid Member</p><p>The way the RigidMemberk acts in individual directions</p><p>Fixed value automaticly defines displacements and rotations constrains</p><p>Custom allows user defined behavior of Rigid Member</p>                                                                                                                                                                                                                                            |
| ux                         | Enum         |   <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Compression only</p><p><br>Tension only</p><p><br>Flexible compression only</p><p><br>Flexible tension only</p><p><br>Non linear</p>  | yes                                                                                                   | <p>Displacement in the direction X</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)</p><p>See notes for coordinates reference.</p> |
| uy                         | Enum         |   <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Compression only</p><p><br>Tension only</p><p><br>Flexible compression only</p><p><br>Flexible tension only</p><p><br>Non linear</p>  | yes                                                                                                   | <p>Displacement in the direction Y</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)</p><p>See notes for coordinates reference.</p> |
| uz                         | Enum         | <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Compression only</p><p><br>Tension only</p><p><br>Flexible compression<br>only</p><p><br>Flexible tension only</p><p><br>Non linear</p> | yes                                                                                                   | <p>Displacement in the direction Z</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>(Flexible) compression/tension only - acts rigid or flexible, only for defined strain (compression or tension)</p><p>See notes for coordinates reference.</p> |
| fix                        | Enum         |                                                              <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Non linear</p>                                                             | yes                                                                                                   | <p>Rotation around X axis</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>See notes for coordinates reference.</p>                                                                                                                               |
| fiy                        | Enum         |                                                              <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Non linear</p>                                                             | yes                                                                                                   | <p>Rotation around Y axis</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>See notes for coordinates reference.</p>                                                                                                                               |
| fiz                        | Enum         |                                                              <p>Free</p><p><br>Rigid</p><p><br>Flexible</p><p><br>Non linear</p>                                                             | yes                                                                                                   | <p>Rotation around Z axis</p><p>Free - That is it imposes no constraint in the direction. Rigid - The connection in fully rigid in the specified direction. Flexible - The connection is flexible (elastic) in the specified direction. Non linear - resistance in specified direction could be defined</p><p>See notes for coordinates reference.</p>                                                                                                                               |
| Stiffness X \[MN/m2]       | Double       |                                                                                             3.00                                                                                             | yes, if ux = Flexible, Flexible compression/tension or Non linear                                     | <p>The flexibility in direction X</p><p>Use this property only if the ux is set Flexible, Flexible compression/tension or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                  |
| Resistance X \[MN/m]       | Double       |                                                                                             0.25                                                                                             | yes, if ux = Non linear                                                                               | <p>The resistance in direction X</p><p>Use this property only if the ux is set to Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                                          |
| Stiffness Y \[MN/m2]       | Double       |                                                                                             2.50                                                                                             | yes, if uy = Flexible, Flexible compression/tension or Non linear                                     | <p>The flexibility in direction Y</p><p>Use this property only if the uy is set Flexible, Flexible compression/tension or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                  |
| Resistance Y \[MN/m]       | Double       |                                                                                             0.30                                                                                             | yes, if uy = Non linear                                                                               | <p>The resistance in direction Y</p><p>Use this property only if the uy is set Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                                             |
| Stiffness Z \[MN/m2]       | Double       |                                                                                             2.00                                                                                             | yes, if uz = Flexible, Flexible compression/tension or Non linear                                     | <p>The flexibility in direction Z</p><p>Use this property only if the uz is set Flexible, Flexible compression/tension or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                  |
| Resistance Z \[MN/m]       | Double       |                                                                                             0.75                                                                                             | yes, if uz = Non linear                                                                               | <p>The resistance in direction Z</p><p>Use this property only if the uz is set Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                                             |
| Stiffness Fix \[MNm/rad/m] | Double       |                                                                                             5.00                                                                                             | yes, if fix = Flexible or Non linear                                                                  | <p>The flexibility in rotation around X axis</p><p>Use this property only if the Rotational stiffness fix is Flexible or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                   |
| Resistance Fix \[MNm/m]    | Double       |                                                                                             1.00                                                                                             | yes, if fix = Non linear                                                                              | <p>The resistance in rotation around Y axis</p><p>Use this property only if the Rotational stiffness fix is Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                |
| Stiffness Fiy \[MNm/rad/m] | Double       |                                                                                             6.25                                                                                             | yes, if fiy = Flexible or Non linear                                                                  | <p>The flexibility in rotation around Y axis</p><p>Use this property only if the Rotational stiffness fiy is Flexible or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                   |
| Resistance Fiy \[MNm/m]    | Double       |                                                                                             0.80                                                                                             | yes, if fiy = Non linear                                                                              | <p>The resistance in rotation around Y axis</p><p>Use this property only if the Rotational stiffness fiy is Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                |
| Stiffness Fiz \[MNm/rad/m] | Double       |                                                                                             3.00                                                                                             | yes, if fiz = Flexible or Non linear                                                                  | <p>The flexibility in rotation around Z axis</p><p>Use this property only if the Rotational stiffness fiz is Flexible or Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                   |
| Resistance Fiz \[MNm/m]    | Double       |                                                                                             0.10                                                                                             | yes, if fiz = Non linear                                                                              | <p>The resistance in rotation around Z axis</p><p>Use this property only if the Rotational stiffness fiz is Non linear</p><p>See notes for coordinates reference.</p>                                                                                                                                                                                                                                                                                                                |
| Id                         | String       |                                                                             39f238a5-01d0-45cf-a2eb-958170fd4f39                                                                             | no                                                                                                    | Unique attribute designation                                                                                                                                                                                                                                                                                                                                                                                                                                                         |

## Notes

{% hint style="info" %}
Local coordination system is given by first node and its related object.

**Non linear** behavior of material is handled with "Resistance". The example is shown below.
{% endhint %}

![](https://2984879901-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FP3f3I86mz7TGPX0pWLAB%2Fuploads%2Fgit-blob-fe761fbc9d56154668b1d1049961733fd89195ed%2F25_rigidlink_resistance%20\(1\)%20\(1\).png?alt=media)