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


No, this is unfortunately not possible.

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

If you select rib members and regular members in a reinforcement group for the design in the RF‑CONCRETE Members add-on module, the rib members will be automatically removed from this reinforcement group. The corresponding message appears, as shown in Figure 01.

If you only select one rib member in the reinforcement group for the design, a message appears saying that the fire resistance design is not possible for this cross-section type. See the following figure:


Rib Downstand beam Fire resistance T-beam


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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

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

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD
RFEM Concrete Structures

Add-on Module

Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)

Price of First License
810.00 USD
RSTAB Concrete Structures

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Linear and nonlinear analysis of reinforced concrete members with reinforcement concept

Price of First License
810.00 USD