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2019-08-28

Question

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


Answer:
Basic Internal Forces

These are the internal forces of a surface that are related to the local coordinate system (x, y, z) of the surface. The x- and y-axes lie on the surface, the z-axis is perpendicular to the surface. The bending moment mx, for example, represents the bending moment that generates bending stresses in the x-direction (not about the x-axis!).

Principal Internal Forces

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

Design Internal Forces

These internal forces are required for reinforced concrete design. + and - indicate the positive and negative sides of the surface.

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


Author

Mr. Baumgärtel provides technical support for Dlubal Software customers.

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