Shell PT: PT Editor (Spline Geometry)#
Creates tendon geometry and assigned tendon as spline geometry using an unwound axis geometry.
SOFiPLUS > Prestressing > Shell PT
The tendon geometry corresponds to a spline geometry. To modify the tendon elements use the Modify Tendons command (Icon: ).
A graphical editor with an accessible UI enables the efficient definition of tendon geometries in reference to a developed geometry from a geometric axis. Graphical selection and multi-edit allow for efficient modification. The integration into SOFiPLUS-(X) along with its 3D capabilities enables quick geometry checks and fast turnaround times during design.
Merging Slab PT with Shell PT or Beam PT in a drawing is not recommended. Of course Shell PT and Beam PT can be mixed.
Elements with reference to a geometric axis could be modified and duplicated within the context menu of the sidebar. The following options are available for use:
Edit with PT Editor…: Opens the marked element in the PT Editor.
Clone…: Creates an additional tendon on the selected tendon geometry.
Copy…: Copies the selected tendon geometry and all assigned tendons with an offset.
Copy to a different axis…: Copies the selected tendon geometry and all assigned tendons and projects it to another axis. The second axis must have the same number of placements. It is recommended to use span stations for the definition of tendons. Therefore the copied tendon will be set to the right stations.
Erase: To delete the marked element.
Collapse all: Closes all entries in the sidebar.
Tab Edit Geometry#
Type of geometry#
This is to define a standard T-geometry. A detailed description of the T-geometry can be found in the chapter ‘PTUV – Standard T-Geometry’ of the manual TENDON.
For each tendon geometry a prestressing system must be defined. This is used for all tendons belonging to the tendon geometry.
The PT-Editor allows the definition of a tendon geometry by specifying constraint points along a geometric axis. Additional points can be inserted by using the right click option in the table. The geometry will be affected by the following input parameters:
Type of the point
U Horizontal distance from reference axis
V Vertical distance from reference axis
Horizontal inclination du/ds
Vertical inclination dv/ds
Straight line in negative direction
Straight line in positive direction
Influence length of radius
The table in PT Editor also allows to directly inserting tables from the clipboard by using crtl+v.
The position of a point can be changed by editing the value directly in the table.
Tab Edit Tendons#
On the previously defined single tendon geometry (Tab Edit Geometry) one or more tendon(s) may be created.
Structural properties such as the construction sequence and prestressing forces can be assigned to each tendon
individually. Additional tendons can be inserted by using the right click option in the table or by using the
If a tendon is marked, the properties are shown in a property bar on the right side of the dialog. In the upper part there are general properties of the tendon. In the lower part one can modify properties for the calculation of the friction.
Stressing forces are computed automatically considering stressing sequences, wedge slip, friction, wobble, etc. The user, however, can limit the max force/stress/factor of the tendon at individual points:
Prestressing: According to AASHTO
This option is conform to the chapter ‘PAAS – Prestressing limits according to AASHTO’ of the manual TENDON.
Prestressing: According to Eurocode
This option is conform to the chapter ‘PSIG – Prestressing limits according to Eurocode’ of the manual TENDON. A description of the possibilities and the default values can be found there.
Prestressing: With Factors
This option is conform to the chapter ‘PFAC – Prestressing limits with factors’ of the manual TENDON.
Prestressing: Manual Prestressing
This option is conform to the chapter ‘PDEF – Manual prestressing’ of the manual TENDON.
Prestressing: Additional Data
This option is conform to the chapter ‘PDAT – Additional data of the prestressing’ of the manual TENDON.