Fórmula 4

\begin{array}{l} M_{T} = F_{z, Ed} \cdot \frac{b_{Rail}}{4} \\ β = \frac{π \cdot h_{w}}{a} \\ I_{T, chord} = \frac{b_{cs} \cdot t_{f} ³}{3} \\ λ = \sqrt{\frac{2, 98 \cdot t_{w} ³}{a \cdot I_{T}} \cdot \frac{\sin h ² (β)}{\sin h (2 \cdot β) - 2 \cdot β}} \\ σ_{z, Ed, ecc} = \frac{6}{t_{w} ²} \cdot M_{T} \cdot \frac{λ}{2} \cdot \tan h (\frac{λ \cdot a}{2}) \\ M_{web} = σ_{z, Ed, ecc} \cdot \frac{t_{w} ² \cdot l_{eff}}{6} \\ σ_{z, Ed, ecc, WELD} = \frac{M_{web}}{(t_{w} a_{w}) \cdot a_{w} \cdot l_{eff}} \end{array}

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