Input of Tendons
Geometry
- Interactive graphic input. Structure lines,
e.g. along the roadway axis of a bridge, act as reference lines
for the tendon geometry.
- The vertical course of a tendon is a curve through definable points for which
the direction and weight of the tangents can be given. It may also contain
segments with constant (minimal) radius of curvature or the layout may be polygonal
for externally guided tendons.
- The vertical course can alternatively be defined as a series
of parametrized quadratic or cubic parabolas.
This type of input is compatible with STATIK-3 and allows
the import of tendons from STATIK-3 calculations.
- The horizontal course results from guide lines defined in the cross sections
of the members passed through. An additional horizontal excentricity can be
defined by specifying a curved line, the so called plan view curve
Tendon Properties
- Steel quality
- bonded / unbonded
- Friction coefficient, wobble, wedge draw-in
- Area of strand and number of strands
- Minimal radius of curvature
Stressing Process
The following procedures at the ends of the tendons can be specified
in any order:
- Stressing / releasing up/down to a given force
- Releasing down to a maximum force along the tendon after anchoring
- Considering of edge draw-ins.
Tendons may be stressed in a given construction stage and re-stressed
in a later stage
Tendon Groups and Construction Stages
Tendons are always combined in groups with the following properties:
- There is a layer for each tendon group for better viewing
- An individual loading is generated from the actions of each tendon group
- Each tendon group is assigned to a construction stage, which means that
its tendons are not active in earlier construction stages.
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