RF-CONCRETE Surfaces – Online Manual Version 5

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RF-CONCRETE Surfaces – Online Manual Version 5

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2.6.4.2 Check of principal internal forces

Check of principal internal forces

The program first checks if the concrete cracks under the principal moment in the ULS. In the serviceability design details of the relevant grid point, we can see that this is indeed the case:

Figure 2.81 Check of principal internal forces

The linear-elastically determined stress σc,I,-z at the upper concrete edge is compared to the mean value of the axial tensile strength fctm of 2.9 N/mm2 for concrete C30/37.

σc,l,-z = ml,-zW = m · 6b · h2 = 33.65 · 61.0 · 0.22 = 5.05 N/mm2 

Thus, the concrete edge stress σc,I,-z = 5.05 N/mm2 significantly exceeds the tensile strength fctm. Therefore, the reinforcement is also activated for the serviceability limit state.