I would like to define line support with ineffective tension and include, instead, the tension force via nodal support on this line. 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, line supports and nodal supports are treated on each FE node. If a nodal support is located on a line support, an FE node thus receives several support definitions. If the defined directions of the supports do not match, this is not critical and the warning message can be ignored. If the same directions are defined several times, contradictions may occur.
In case of line support which is failing on the tension and 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 support definition in the area of each nodal support. It may also be useful to model the tension bracket using a newly defined member. The force transmission can then be adjusted by means of the support of the member, the member type itself, and the member end release.


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

Keywords

Line support Nodal support Nonlinearity

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