Chord prestress coefficient kₚ EN 1993-1-8

Chord prestress coefficient k_p EN 1993-1-8

k_{p} = 1 + 0.3 \cdot n_{p} \cdot (1 - n_{p})

n_{p} = \frac{f_{p}}{f_{y}}

f_{p} = \frac{N_{p}}{A_{0}} - \frac{|M_{0}|}{W_{0}}

k_p	Chord prestress coefficient
n_p	Ratio
f_p	Value of acting compressive stress in chord member without stresses due to components of strut forces at connection parallel to chord
f_y	Yield strength
N_p	Starting axial compressive force in chord
A₀	Cross-sectional area of chord member
M₀	Secondary moment from eccentricity
W₀	Elastic section modulus of chord cross-section

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