I would like to define a line support with ineffective tension and apply the tension force on this line by using a nodal support instead. Why does the line support still receive a tension force?

Answer

If nodal supports are modeled on supported lines, this may lead to problems and incorrect definitions. Therefore, the following warning message appears in the plausibility check.


Internally, the line supports and nodal supports are treated on each FE node. If there is a nodal support located on a line support, an FE node thus receives several support definitions. If the defined directions of the supports are not equal, this is not critical and the warning message can be ignored. If the same directions are defined several times, discrepancies may occur.
In the case of a line support that is failing under the tension and a nodal support on this line, the tension force thus results in the FE node which, however, counts to the line support and to the nodal support.


To avoid this behavior, it is possible to insert a short line without a support definition in the area of each nodal support. It may also be useful to model a tension bracket by using a newly defined member. The force transmission can then be adjusted by using the support of the member, the member type itself, and the member end release.


In general, the support stiffenings should be estimated in a realistic way; in the example, rigid supports were assumed as a simplification.

Keywords

Line support Nodal support Nonlinearity

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