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When calculating an inclined plate, I receive very high result values for the line supports at 2 edge nodes. Why is this how it works and how can this be avoided?

Answer

The default definition of surface elements assumes an isotropic material behavior. The load attempts to get to the supports as quickly as possible. The stiffness of the elements also plays a role here.
The structural behavior or the load transfer is best represented and understood with the trajectories of the principal moments α b for plates. For wall elements, consider the trajectories of the principal axial forces α m .
In this example, the load is not applied parallel to the free plate edges but almost perpendicular to the supports, because this is the shortest path of the load transfer.
At the blunt corners of the system, the load application area is larger than in the support centers, corresponds to a singularity location and thus results in large peak values.
In order to force the system to remove the load parallel to free plate edges, the following procedure is the fastest:
Definition of an orthotropic plate. The "effective thicknesses" orthotropy type is recommended. Thickness of the actual plate thickness is specified in the support direction and a very small thickness (for example 1mm) in the secondary load.
The second graphic shows the difference between both models.

Keywords

Line support Orthotropic Schiefwinklig Effective thicknesses

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