Chord prestress coefficient kₚ EN 1993-1-8

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Chord prestress coefficient kp EN 1993-1-8

kp = 1 + 0.3 · np ·  1 - np np = fpfyfp = NpA0 - M0W0

kp Chord prestress coefficient
np Ratio
fp Value of acting compressive stress in chord member without stresses due to components of strut forces at connection parallel to chord
fy Yield strength
Np 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

Chord prestress coefficient kₚ EN 1993-1-8

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