Fórmula 13

α_{LT} = 0, 34

β = 0, 75

λ_{LT 0} = 0, 40

M_{cr} = C_{1} \cdot \frac{π^{2} \cdot E \cdot I_{z}}{{(k \cdot L)}^{2}} \cdot (\sqrt{(\frac{k}{k_{W}}) \cdot \frac{I_{W}}{I_{z}} \frac{{(k \cdot L)}^{2} \cdot G \cdot I_{t}}{π^{2} \cdot E \cdot I_{z}} {(C_{2} \cdot z_{g})}^{2}} - C_{2} \cdot z_{g})

k = 1, 0

k_{w} = 1, 0

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