Pull-out Resistance (Grouting)
The method of analysis is selected in the section "Pull out resistance (grouting)".
Setting of analysis for pull out resistance (grouting)
This bearing capacity determines a pullout resistance from the root and is calculated equally for prestressed bar and strand anchors.
Option "Calculate from shear strength"
where: | ds (d1) | - | diameter of the anchor bar (strand diameter corresponding to the strand area) |
lk | - | root length | |
τ | - | shear strength between the anchor bar and grouting |
Option "Calculate from concrete strength"
It is the same analysis as in the previous case, the shear strength τ is calculated from the parameters of concrete according to the different standards:
- EN 1992-1-1 (EC2)
where: | η1 | - | coefficient of cohesion (1,0 for good conditions of cohesion, 0,7 in other cases) |
fctd | - | concrete strength in tension - obtained from fck by formulas; ≤ C60/75 value |
- ACI 318-11
where: | fc' | - | concrete strength in compression |
- GB 50010-2010
where: | α | - | coefficient of reinforcement type |
1,47 – 7-strand | |||
1,56 – 3-strand | |||
1,79 – plain reinforcement bar | |||
1,92 – ribbed steel wire | |||
ft | design concrete strength in tension; ≤ C60 value |
Option "input bearing capacity per unit length"
where: | Rc, bm | - | pull out resistance [kN/bm, lbf/ft] from grouting per unit length |
LK | - | root length |
Option "input"
The value of pull out resistance (grouting) is entered Rc [kN, lbf]