How to model a plate that is supported along the edges
Sample model: Fixed-Plate.s3d
Start by adding the boundary nodes of your plate, in this example we will run a 5x5m plate:
Once the nodes are defined, connect them via a member and add supports at each of the nodes. It should look something like this:
Make sure these members are set as continuous so they pickup the internal nodes that will be generated when we mesh our plate.
Now as we want these members to be completely rigid and act as a support, we are going to adjust the section properties to be that of an extremely rigid member with virtually no self weight. We will do this by setting the material and section properties as exceptionally large numbers:
Note: Here we are using 9e14 as a shorthand input which will evaluate itself to 9×10^14 or 900,000,000,000,000
Finally, we will add our plate by entering in the boundary nodes and running a 15×15 structured quadrilateral mesh as follows:
At this point we have our 4 supports, supporting extremely rigid members in which the plate is connected to. So we can anticipate that the load on the plate (via point load or self weight) will then transfer to these infinitely rigid members and cause no deflection at this point.
Applying a self weight should give the following results:
As we can see in the model, the members (end the edges of the plate) are not deflecting at all given the edges are all supported and the deflection is symmetrical as expected.
It is important to also note that the members are connected to the plate as a fixed connection by default.