FAQ 000399 EN

Display Settings RFEM

What is the difference between the basic internal forces, the principal internal forces and the design internal forces in RFEM?


Basic internal forces:

These are the surface internal forces which are related to the local coordinate system (x,y,z) of the surface. The x- and y-axes lie in the surface, the z-axis is set perpendicular to the surface. For example: The bending moment m-x represents the bending moment creating bending stresses in x-direction (not about axis x!)

Principal internal forces:

These are the internal forces that are related to the principal axes (1,2,3) of the surface. The internal forces in direction of axis 1 represent the extreme values (maxima and minima). The angle between the surface axis x and axis 1 is displayed as alpha_b for bending moments.

Design internal forces:

These internal forces are required for the design of reinforced concrete structures. The plus and minus signs ( + and - ) indicate the positive or negative side of the surface.

The internal forces in surfaces are described in detail in the RFEM manual:

Go to RFEM 5 manual...

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