FAQ 002480 EN

21 February 2019

Markus Baumgärtel Modeling | Structure RFEM

How can I model a hole bearing in the model?

Answer

In the case of a hole bearing, the forces are only transferred by compression. Tensile forces do not occur. These effects could be modelled as follows (for an example, see the figure):

1. Create an opening in a surface. 

2. Create a beam member with the nonlinearity failure under tension and apply it in the opening. It is important to use a beam member and no compression member (a compression member is a truss member, which would make the structural system kinematic).

3. Rotate the member in the opening and copy it several times. 

Instead of the member, you could also fill in the opening by a surface with the stiffness membrane without tension. When using this surface stiffness, the following happens:

The calculation is performed in several iterations. After the first iteration, it is checked, in which surface element for the main membrane stress the tension occurs. These elements will fail in the next iteration (to be more precise, the stiffness is greatly reduced).

Both modelling variants should give you roughly the same results.

Keywords

bolt connection hole bearing compression member nonlinearity failure under tension membrane without tension

Reference

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