Is it possible to perform a fire resistance design for a rib?


No, this is unfortunately not possible.

In the current state of development of RFEM and RSTAB, it is only possible to design rectangular and circular cross-sections with the add-on module RF-CONCRETE Members or CONCRETE.

If rib members and regular members in a reinforcement group are selected for design in the add-on module RF-CONCRETE Members, the rib members are automatically removed from this reinforcement group. They contain a note in this regard, as shown in Figure 01.

If only one rib member is selected for design in a reinforcement group, you see that the fire resistance design is not possible for this cross-section element. See the following graphic:


Rib Downstand beam Fire resistance T-beam


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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

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

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Price of First License
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Price of First License
810.00 USD