The tendon geometry is described using lines.
Defining Lines
The tendon lines can be defined freely in three-dimensional space. However, the following conditions apply:
Suitable line types for tendons include:
- Parabola
- Spline
- NURBS
The line types are described in the chapter Lines of the RFEM manual.
The line of a tendon does not need to be present over the entire length of the prestressed concrete cross-section. This allows for staggered arrangements of tendons.
Importing Geometry
You can also use import options and scripts to model the tendon lines.
Background Layer
Lines can be imported into the model as a kind of "layer" using background layers. They can then be used to set lines. This option is described in the chapter Background Layers of the RFEM manual.
Excel
The course of a line can be described by nodes in an Excel file. The Excel worksheet can be imported into the 'Nodes' table. This option is described in the chapter Import or Export of Excel Table of the RFEM manual.
API
The Python-based Dlubal API Service provides another convenient way to define and update the tendon geometry. In the following example, the parabolic curve of a tendon is generated in this way.
Using Blocks
The option to import predefined blocks of tendons is currently in development.