Force Coefficient of Structural Elements

C_{f} = C_{f . 0} \cdot ψ_{r} \cdot ψ_{λ} \to C_{f} = 2, 10 \times 1 \times 0, 63 = 1, 31

c_f,0	The force coefficient of rectangular sections with sharp corners and without free-end flow
ψ_r	The reduction factor for square sections with rounded corners
ψ_λ	The end-effect factor for elements with free-end flow

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