Is the longitudinal reinforcement defined in RF-CONCRETE Surfaces taken into account for the determination of internal forces in RFEM?


No, the basic reinforcement defined in RF-CONCRETE Surfaces is not considered in the determination of internal forces in RFEM. In RFEM, the internal forces are determined with the modulus of elasticity of the selected concrete. The reinforcement amount has no influence (linear-elastic calculation, state I).

The situation is different if you perform a nonlinear design in state II in the serviceability limit state by means of the RF-CONCRETE NL add-on module. Here, you specify an existing basic reinforcement that you want to consider for the nonlinear calculation in state II. In nonlinear design (available only for SLS), the determination of internal forces is carried out with the effective stiffnesses (state II). Thus, the defined reinforcement has an influence on the internal forces.

You can evaluate these internal forces (from state II influenced by the defined reinforcement) in the results of RF-CONCRETE Surfaces. See Figure 01 with the Results navigator of the RF-CONCRETE Surfaces add-on module.


Internal forces Existing basic reinforcement Determination of internal forces Reinforcement Stiffness


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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
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
RFEM Concrete Structures

Add-on Module

Physical and geometrical nonlinear calculation of beam and plate structures consisting of reinforced concrete

Price of First License
1,300.00 USD