公式 1

\begin{array}{l} c = 590 - 2 \cdot (25 27) = 486 mm \\ vorh \frac{c}{t_{w}} = \frac{486}{13} = 37, 38 \\ grenz \frac{c}{t_{w}} = 72 \cdot ε = 72 \cdot 1 = 72 > 37, 38 \end{array}

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