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After the form-finding, I have exported the deformed shape to a DXF file and found that the results of the DXF file do not correspond to RFEM. What is the reason?

Answer

The deformations of load cases and load combinations always refer to the deformed form-finding shape and thus to the shifted FE mesh. In this case, the result is saved in the "DL_LK_DEFORMATION u" layers. The "DL_FE_MESH" layer shows the result of the form-finding. The initial structure is located in the "DL_TOPOLOGY" layer.

If generating the DXF file while the "Form-Finding" load case is active (see Figure 02), that is, not via a load case or a load combination, the deformation for the initial structure can be found in the "DL_FE_MESH" layer. However, this only applies to surfaces. The deformations of the "DL_LK_DEFORMATION u" layers are not important in this case, and should be hidden.

If the structure consists only of members/cables, no shape can be exported via the active load case "Form-Finding". This currently only works for surfaces. In order to export the found form of the members anyway, please create an empty load case, have it calculated and then export the results of this load case. The shape can then be found in the "DL_LF_DEFORMATION u" layer.

Basically, the display factor should be set to "1" when exporting the deformed structure (see Figure 03). Defining a larger or smaller factor also affects the result in the DXF file.

Keywords

Deformed shape DXF Form-finding

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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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