Fórmula 2

\begin{array}{l} σ_{s} = \sqrt{w_{k} \cdot \frac{3, 48 \cdot 10^{6}}{d_{s}^{*}}} = 185, 41 N / mm ² \\ d_{s}^{*} = d_{s} \cdot \frac{8 \cdot (h - d)}{k_{c} \cdot k \cdot h_{cr}} \cdot \frac{2, 9}{f_{ct, eff}} \leq d_{s} \cdot \frac{2, 9}{f_{ct, eff}} \end{array}

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