After having run the form-finding, I 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 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 situated in the 'DL_TOPOLOGY' layer.

If the DXF file was generated when 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. The deformations of the 'DL_LK_DEFORMATION u' layers are not important in this case and should be hidden.

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

Main Program

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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RFEM Tensile Membrane Structures
RF-FORM-FINDING 5.xx

Add-on Module

Form-finding of tensile membrane and cable structures

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