Ideal Shear Stiffness of Stiffening Bracing

Ideal shear stiffness of the stiffening bracing

s_{id} = E_{D} \cdot A_{D}' \cdot \sin {(α)}^{2} \cdot \cos (α)

s_id	Ideal shear stiffness of the stiffening bracing
E_D	5 % quantile of the diagonals' modulus of elasticity
A_D'	Notional cross-sectional area of diagonals
α	Angle between diagonals and chords

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