📐 PTI Friction Formula (Curvature Friction μ = 0.05-0.14 & Wobble K = 0.0010/ft)

PT Tendon Friction & Wobble Loss Calculator

Calculate prestress force losses along draped post-tensioned tendon profiles using the standard exponential friction formula under ACI 318 Section 20.3: calculate curvature friction losses (μ = 0.05 to 0.14) and unintentional wobble friction losses (K = 0.0005 to 0.0014 per foot of duct length), determine seating loss wedge draw-in (0.25"), and PT engineering margins.

1. Project & Operating Inputs

Post-Tensioned Slabs Engineered (Floor Count e.g. 18 PT Slab Levels)

Angular Parabolic Drape (Radians e.g. 0.45 Radians Cumulative Drape)

Customer Bid Price for 3D PT Tendon Layout & Loss Optimization ($)

ADAPT-Floor Pro / RAM Concept Modeling, Structural PE Certification ($)

2. Financial Breakdown & Yield

EXPONENTIAL PT FRICTION LOSSES

Turnkey PT Engineering Study Profit

Structural Concrete Consulting Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost