公式 5

\begin{array}{l} ε = \sqrt{235 / f_{y}} = \sqrt{235 / 355} = 0.814 \\ λ_{1} = 33 \cdot ε = 33 \cdot 0.814 = 26.8 < \frac{c_{1}}{t_{w}} = 32.5 \\ λ_{2} = 38 \cdot ε = 38 \cdot 0.814 = 30.9 < \frac{c_{1}}{t_{w}} = 32.5 \\ λ_{3} = 42 \cdot ε = 42 \cdot 0.814 = 34.2 > \frac{c_{1}}{t_{w}} = 32.5 \end{array}

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