I design surfaces in RF‑CONCRETE Surfaces and get a high minimum reinforcement in some areas as a result of the SLS design. In other areas, however, the minimum reinforcement is significantly smaller. What is the reason?

Answer

By default, the determination of the minimum reinforcement is based on the stress distribution in the tension zone before initial cracking (coefficient kc according to EN 1992‑1‑1, 7.3.2 (7.2.)), which depends on the external loading (Figure 01). It means that kc is variable by deafult.

Depending on the state of stress (for example, pure bending, bending and tension, bending and compression, and pure tension), the minimum reinforcement can vary along the surface.

However, it is also possible to adjust the presetting. It is possible to select a bending constraint (kc = 0.4) or a centric constraint (kc = 1.0) (Figure 02).

As soon as the constant value for kc is assumed, the minimum reinforcement is independent of the external load and is applied uniformly over the structural component.

In this context, you can also select the direction in which the force should be considered (Figure 03).

Keywords

Minimum reinforcement Restraint Centrical Bending restraint

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RFEM 5.xx

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