Tendon definition

Section view

Setting	Description
Transversal / Longitudinal	These two options allow for visualizing the tendon arrangement and geometry of the currently selected tendon profile in cross-sectional and longitudinal view.

Tendon profiles

A tendon profile comprises a group of tendons with the same properties in regard to geometry, tendon specific data and stressing procedure.

By using Insert / Delete / Copy buttons on the right hand side of the window new tendon profiles can be inserted, deleted and copied as follows:

Insert will insert a new tendon profile after the selected line using default values.
Delete removes the currently selected tendon profile from the list.
Copy will copy the currently selected tendon profile to the position after the selected line taking over all data.

Setting

Description

No.

Indicates the consecutive number of the particular tendon profiles (cannot be edited).

Type

General geometric reference position for the definition of the tendon geometry

Setting	Description
/ WebC	Tendon positions are referred to the centerline of the web

Ref. object

Further geometric reference position for the definition of the tendon geometry

Setting	Description
/ Web1	Tendon positions are referred to the left web
/ Web2	Tendon positions are referred to the right web

No of tendons

Number of tendons in the tendon profile

A-tendon

Nominal area of one tendon of the tendon profile

D-duct

Nominal area of one duct of the tendon profile

Friction factor

Coefficient of friction between tendon and duct (ì)

Wobble

Setting	Description
Eurocode	kEC: unintentional angular displacement (per unit length)
American Standard-AASTHO	kWobble: wobble factor (per unit length)

Ref .force / Ref. stress

Reference force and reference stress to be applied to one tendon in the tendon profile.

The pre-stressing can be defined as force or as stress. Any input will update the other by the relation of the tendon area (see A-tendon).

SSequence

Stressing Sequence

A specific stressing sequence can be assigned to a particular tendon profile.

Other stressing sequences then the "default" one have to be created first within the menu "Stressing Sequence".

SIGmax

Sigma max describes the allowed stress in the tendon immediately after completion of the stressing procedure (i.e. including all immediate losses); this value is informative and taken from the default material properties of the selected pre-stressing material for the tendons (see menu Superstructure / Material).

Tendon Geometry

Definition of the tendon geometry of the tendons in a particular tendon profile

Particular specific geometric positions of a tendon are defined by giving their position within the cross-section at a certain position in longitudinal direction. The geometry in between these constraint positions is calculated in regard to the defined interpolation.

The basis of the reference position within the cross-section is defined in the Tendon profile by means of the inputs of Type and Ref. object. Additional offsets defined within here give the exact position within the cross-section.

The position in longitudinal direction is given by referring to the number of the span and the position within the span.

By using Insert and Delete buttons on the right hand side of the window new tendon positions can be inserted or deleted:

Insert will insert a new tendon position after the selected line using default values.
Delete removes the currently selected tendon position from the list.

Setting

Description

Point

Number of the consecutive tendon positions comprising the tendon geometry (cannot be edited)

Span

Number of the span for defining the tendon position in longitudinal direction

x/L

Ratio that defines the tendon position within a span, where x is the length from the begin of a span to the respective tendon position and L the total length of the span

From

Reference position for defining the tendon position in vertical direction

Setting	Description
/ Top	Tendon position is referred to the top of the cross-section
/ Bottom	Tendon position is referred to the bottom of the cross-section

Height

Offset for the tendon position in vertical direction related to the reference position given in From

Offset

Offset for the tendon position in transverse direction related to the reference position given in Tendon profile / Type

Distance

Offset for the horizontal distribution of the individual tendons defined in a tendon profile

The distribution will be done in a way that the defined tendon position will always be the CG of the distributed tendons.

Variation

Defines the interpolation between defined tendon positions; i.e. the type of interpolation to the next tendon position.

Setting	Description
/ Straight	Linear interpolation to the next tendon position
/ Curved	Interpolation by a parabola of third order to the next tendon position

Note: "Curved" variation will not be displayed graphically in the longitudinal view, but just be indicated by a dotted line.