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GEO5

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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]

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