I have defined a notch on a support. Why is it not taken into account for the reduction factor kv?

Answer

It is necessary to consider the effect of the stress concentration at the notch for the ultimate limit state design. According to EN 1995‑1‑1, 6.5.1, this is ensured by the reduction factor kv. The calculation of kv is defined in EN 1995‑1‑1 in the equations 6.61 to 6.63. Further specifications for the reduction factor can also be found in the national annexes.

In our example, the reduction factor kv is determined as expected.

Figure 02 - Notch - Reduction Factor Less than 1.0

In the other structural system, the reduction factor kv is determined as 1.222.

Figure 03 - Notch - Reduction Factor Greater than 1.0

In the example, this is because the fact that a supporting moment is created in the static system and the load on the supports.

Figure 01 - System and Loading

Therefore, the effect of the stress concentration may be neglected at this point, according to EN 1995‑1‑1, 6.5.1 (2). "The effect of the stress concentrations may be disregarded in the following cases: [...] bending with compressive stresses at the notch, see Figure 6.10b."

In our example, the reduction factor can even exceed 1.0 according to the specifications in DIN EN 1995‑1‑1/NA Formula (NA.60).

Keywords

Notch Reduction factor Support

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