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When calculating an oblique-angled plate, I get very high result values for the line supports at 2 edge nodes. What is the reason of that and how can I avoid it?


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.
For plates, the structural behavior or the load transfer is best represented and understood with the trajectories of the principal moments αb. For wall elements, it is necessary to consider the trajectories of the principal axial forces αm.
In this example, the load is not applied parallel to the free plate´s 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 absorption area is larger than in the support centers, corresponds to a singularity point and has -as a consequence of that- 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. It is recommended to use the orthotropy type 'Effective Thicknesses'. The effective plate thickness has to be specified in the support direction and a very small thickness (e.g. 1mm) in the secondary support effect.
The second graphic shows the difference between both models.


Line support Orthotropic Oblique-angled Effective Thicknesses


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