How can a downstand beam be retroactively modeled under an existing floor so that only vertical compression forces are transferred?

Answer

In this case, the slab should rest on the downstand beam without any bond (see Figure 1).

Figure 01 - Ceiling with Downstand Beam

First, assign the member type 'Beam' to the downstand beam because the rib is not effective here due to the missing joint.

To implement the non-linearity 'Only Transfer of Compression Forces in Z-Direction', you can use the 'Line Release' function. In this case, all forces and moments must be activated, that is, released, within the 'New Line Release Type' dialog box. Moreover, for uz, the non-linearity "Fixed if vz Is Positive" must be set, see Figure 2.

Figure 02 - Line Release Type

The line of the member within the corresponding area should be selected as a line to be released, and the corresponding surface like a released object.

Keywords

Line release Additionally Downstand beam Shear coupling Bond Contact

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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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