Distancia del centro de gravedad de la sección ideal en estado fisurado

z_{II} = \frac{\frac{b \cdot {x_{II}}^{2}}{2} + α_{e, II} \cdot (A_{s, def, - z, (bottom)} \cdot d_{ef, - z, (bottom)} + A_{s, def, - z, (top)} \cdot d_{ef, - z, (top)})}{b \cdot x_{II} + α_{e, II} \cdot (A_{s, def, - z, (bottom)} + A_{s, def, - z, (top)})}

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