Plates are the two dimensional elements of a structure. Most commonly they are used to model slabs, walls, and decks under applied loads.
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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.
- 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 axis (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 – Offset the plate perpendicular to its plane. Similar to member offsets, the plate is connected to the node locations using rigid links.
- Plane State – Choose whether to calculate Plane Stress or Plane Strain during analysis of your plate
As a plate is created, it will appear as a shaded region with a label. Plates are identified by their plate number which appears in the middle of the plate by default. Users can click and move the plate number label if they wish.
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 Plates Datasheet. This method is similar to the first, 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. Note, when specifying nodes in the table, order the nodes as they appear around the plate. i.e. go in a clockwise or counter-clockwise order to create a “string” of nodes that make up the 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.