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eng.post-tensioned-friction-loss Calculator
Calculates prestress loss due to friction in post-tensioned tendons using the wobble and curvature friction coefficients. Friction losses along a curved post-tensioned tendon can reach 20–40% of jack load — accurate estimation is critical to achieving the required effective prestress.
Inputs
Pi Kn
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
Mu
Reference formula or conversion factor shown for context.
Alpha Rad
Reference formula or conversion factor shown for context.
K Per M
Reference formula or conversion factor shown for context.
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
force at far end Px (kN)
The value at the specified point or condition.
friction loss ΔP (kN)
The decrease or degradation from the baseline.
loss as % of jacking force
The decrease or degradation from the baseline.
Px = Pi · e^(−μα − kL)
Reference formula or conversion factor shown for context.
μ (curvature) | k (wobble)
The value at the specified point or condition.
anti-friction recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.