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I have inserted a result beam above a door opening. Why do the shear forces and moments differ so strongly from an ideal single-span beam?

Answer

If the result beam is defined correctly, there may be a coarse FE mesh in the lintel area, which leads to rough inaccuracies in the results (in this case, shear forces, see Figure 1).

Figure 01 - Rough FE mesh

It is recommended to create about ten finite elements above the height of the door opening. For example, if the height above the door opening is 0.5 m, a target FE mesh width of 0.05 m is adequate in this area so that the desired results are achieved (see Figure 2: Shear forces).

Figure 02 - Fine FE mesh

The settings are set globally (Menu → Calculation → FE Mesh Settings) or by using a local FE mesh refinement.

Keywords

Result Result beam Lintel Single-span beam Deviation Error

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RFEM Main Program
RFEM 5.xx

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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