Unbonded Post-Tensioning System

Unbonded Multistrand Tendons

tendon typeDim. 6801 6802 6803 6804
number of strands (St1660/1860)   1 2 3 4
ultimate load kN 279 558 837 1116
load at 0.7f pk z kN 186 372 558 743
nominal weight kg/m 1.2 2.4 3.5 4.7
linear m tendons per ton   833.0 423.7 282.5 211.9
modulus of elasticity N/mm 2 195000
friction coefficient µ 0.06
deflection angle ß °/m 0.5 °/m
radius of curvature m >=2.5
fatigue stress range
of anchorage 		  110N/mm 2 (at s o = 0.65f pk )
support distances m < 1,0
tendon distances  
x
y 		mm
mm 		45
45 		80
60 		100
60 		120
60
dimension of anchorage   
rectangular plate mm 55 / 130 - - -
SD-plate anchorage mm - 130/180 130/180 140/200
anchorage spacing*)    
concrete strength class N/mm 2 B 35 B 25 B 25 B 25
edge distances
min. R 0.6"/0.62"
y
x

mm
mm

70
115

100
140

110
150

120
160
center distances
min. R 0.6"/0.62"
y
x

mm
mm

100
190

160
240

180
260

200
280
*) corresponding bursting reinforcement depending on national standards values for different steel grades (St 1570/1770), strand diameters (0,52", 0,6") and further accessories on request