FRICTION AND SEATING LOSSES IN PRESTRESSED TENDONS

1Material & friction

Units

Friction losses formula style

f_pu ksi

E_s ksi

μ Curvature friction

k Wobble friction 1/ft

ΔS Anchor set in

2Jacking stress / stressing order

Pull 1 stressing end

p_r1 F_jack1 / f_pu

Pull 2 stressing end

p_r2 F_jack2 / f_pu

3VERTICAL PROFILE

Point Type X (ft) Y (ft) Next Segment

L Left anchor

Every → parabola must have a High or Low point at one end and an Inflection or Anchor at the other.
→ Straight segments may connect any two consecutive points of the same type (Low–Low, High–High, or Inflection–Inflection), or an Anchor to any point type.

4HORIZONTAL PROFILE

X (ft) Next Segment Radius (ft)

VERTICAL PROFILE

Diagram section slider

x = 0.00 ft

Parameter	Value
Jacking stress F_jack1	— ksi
Anchor-set loss ΔF₁	— ksi
Influence-zone length x_c1	— ft
Stress at left anchor after set	— ksi
Maximum stress (at x_c1)	— ksi
Stress at far (right) end	— ksi
Elongation at left anchor	— in

Parameter	Pull 1	Pull 2
Jacking stress	— ksi	— ksi
Anchor-set loss ΔF	— ksi	— ksi
Influence-zone length	— ft	— ft
Stress at anchor after set	— ksi	— ksi
Maximum stress	— ksi	— ksi
Far end / junction stress	— ksi	— ksi
Elongation	— in	— in