Properties window Tendons

The properties of the tendons selected in the navigation tree (multiple selection is possible) can be defined or edited in the Properties window.

Depending on the selected type of the tendon (post-tensioned or pretensioned) the input mask changes respectively. In the following, first the inputs of post-tensioned tendons are described. After that, the inputs of pretensioned tendons are described, whereby analogous inputs refer to the already existing descriptions of the post-tensioned tendons.

1. Post-tensioning

Tendons

Name [informative]

Name of the tendon (can only be changed via the navigation tree)

Type

Select to determine the type of the tendon (post-tensioned or pretensioned)

Depending on the selection, the input mask changes

Description

Informative user-defined text

Tendon number

Number of the tendon in the structural analysis

Optionally, you can apply the numbering manually, if the option Auto-numbering within the calculation settings is deactivate, otherwise this is performed automatically.

Straight at Begin / End

Automatically consider a straight section of the tendon at the begin/end

At this, the geometry, beginning at the first/last defined point of the tendon, runs straight along the local tangent over the defined length and from this point (with the direction of the tangent as boundary condition) further to the next/previous tendon point (considering the tangent in this point).

Number of tendon points [informative]

Number of the tendon points defined in the table

Tendon length [informative]

Total length of the tendon measured along the defined geometry in space

Specification

Material

Input or rather select a material for the tendon defined in the menu Analysis/Materials

Duct diameter

Input the diameter of the duct to be considered for the structural analysis for calculating the net concrete cross section area and the grouted duct area

Note: The difference between outer and inner diameter of the duct and thus the thickness of the duct itself are not considered here.

Duct material

Select the material of the duct to be considered within the design code checks

Number of strands

Input the number of the strands of the tendon

Strand area

Input the area of one strand

Total steel area [informative]

Informatively displays the total area of the tendon (=number of strands x strand area)

Losses of prestressing

Deviation definition

Select the wished definition type for inputting the unintentional deviation

Depending on the selection, the respective input fields become active/inactive.

Unintentional deviation Definition according to Eurocode by means of the factor k

Wobble Definition according to AASHTO LRFD by means of the wobble factor k

Friction m

Friction coefficient m between tendon and duct

Unintentional deviation kEC

Value k for the unintentional deviation angle

Wobble factor kWobble

Value for the wobble factor k

Note: The input of this value requires the previous input of the friction coefficient m since internally always the unintentional deviation kEC is processed which is evaluated from these two inputs.

Placement

Anchor block at the begin/end

Input the name of a Placement (PythonPart or Smart Part) which represents the anchor block of the tendon and which is added at its begin and/or end when exporting to ALLPLAN.

Rmin

Informatively displays the value of the smallest evaluated radius of the tendon and its position (measured length along the tendon geometry)

2. Pretensioning

Tendons

See above

Specification

Material

See above

Number of strands [informative]

Always one

Strand area

Input the area of one strand

Total steel area [informative]

Informatively displays the total area of the tendon (=strand area)

Placement

See above

Hooks

Define a hook at the begin and/or end of the defined strand

This is only considered within the structural analysis and not displayed geometrically.

Hook position

Select the position of the hook via the respective checkboxes begin and/or end.

Length of the horizontally running part of the hook following the strand

Length of the vertically running part of the hook following L1

Anchorage length multiplier (EC) / Development length multiplier (AASHTO LRFD)

Multiplier according to the respective design code to be considered in the structural analysis

Debonded length

Begin/End

Define a debonded length at the begin and end of the tendon in whose area there is no bond between strand and concrete and no force is transferred

Transmission length (EC) / Transfer length (AASHTO LRFD)

Length

Length at the begin and end of the tendon over whose area the force in the tendon linearly increases from zero to the full defined size