In RF‑CONCRETE Surfaces, I obtain a high amount of reinforcement in relation to a lever arm that is almost zero. How is such a small lever arm of internal forces created?


The situation could be caused by the following conditions:

  • The reinforcement layers are virtually adjacent to each other in the neutral axis of the surface.
  • You have selected a smaller rebar diameter.
  • The cross-section is completely drawn, that is, there is no neutral axis depth.

In this case, the smallest distance between the reinforcement layers is applied as a lever arm. If it is close to zero, the lever arm is also set as close to zero.


Lever arm Inner Force Concrete cover Reinforcement layer


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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

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