Plates are the two dimensional elements of a structure. Most commonly they are used to model slabs, walls, and grillages under applied loads.
Plates can be created (and edited) via the form, the datasheet, or by using mouse controls. To use mouse controls, ensure you are in the plates menu. Click the nodes – without dragging – that form the plate. Click the last node a second time to end the plate.
To specify a plate in SkyCiv Structural 3D simply provide values for:
- Node IDs – The nodes which make up the plate. Specified by the node numbers separated by commas.
- Plate Thickness – The thickness of the plate. For thick Mindlin plates, it is recommended that the plate area to thickness ratio is below 8. For thin Kirchhoff plates the area to thickness ratio
- Material ID – The ID used to identify the material of the the plate.
The Advanced Settings for plates can be viewed by activating its toggle switch. Advanced form fields have blue labels, and include options for:
- Rotation Z – The rotation (in degrees) of the plate about the it’s normal axist (it’s local Z axis).
- Plate Type – The type of plate element. Mindlin plates are the recommended default. They take into account shear deformations which is appropriate for thick plates and is based on Mindlin-Reissner Theory.Kirchhoff plates do not consider shear deformations which is suitable for thin plates.
- Offset – Specify a distance offset at the starting node A. Use this to model members which are not connected at the centreline.
- Plane State – Specify a distance offset at the ending node B. Use this to model members which are not connected at the centreline.
In this example we will create a plate and apply some supports.
1) Plot the four nodes (0,0,0) , (1,0,0) , (1,1,0) and (0,1,0).
Firstly, plates can be created in a form by clicking the ‘Plates’ menu button on the left navigation bar. Specify 1,2,3,4 as the order of the plate nodes in the ‘Node IDs’ field. Click Apply.
Secondly, plates can be created by clicking into the Datasheet inside the ‘Plates’ menu button. This is just like the form except in tabular format. It allows you to view or create many plates at once. Specify 1,2,3,4 in the ‘Nodes’ column and click apply to create a plate.
Lastly, plates can be created by using mouse controls. To use mouse controls, ensure you are in the Plates menu. Click the nodes – without dragging – that form the plate. Click the last node a second time to end the plate.
3) Apply 4 supports by clicking the ‘Supports’ menu button, and enter in 1,2,3,4 in the ‘Node ID’ field.
This example continues with the Example on how to mesh your plate.