TENDON: Pre- and Post-Tensioning

The SOFiSTiK module TENDON is a tool for the definition of tendon geometry, stress sequences and load case assignment.

TENDON supports any necessary input for any geometry (straights, splines, 3D curves) and any stressing sequence (pre-tensioned, post-tensioned, internal, external). All the relevant losses such as wedge slip, friction, wobble are part of the standard results provided as output. As a result load cases are prepared wherein one or several tendons act as a load on the structure. When analyzing this load case the pre-stressing action itself is divided into two parts ? the primary and the secondary effects. The results of both effects can either be handled as a couple or individually as it suits the selected design code.

When defining the geometry specific boundary then the definitions are set by the user. These boundary conditions can be at the begining and end of the tendon (independent from any element subdivision) the top and bottom position together with radius, straight parts with a specific length, tangents to the geometry etc.

TENDON is available as a version for beam elements (TENDON-B) , and a version for plate/shell elements (TENDON-P). A combined package is available for a reduced price as well.

The input for GEOS will be handled via CADINP or the interactive graphical PT Editor in SOFiPLUS.

 

CADiNP: Parametric input of pre-stress data

The ASCII based CADiNP tool is a powerful way for defining any SOFiSTiK data using many features for parametric and therefore flexible tools. For pres-stressing definitions one can make advantage of grouping repetitive actions in loops reducing the often big amount of input to only a few lines.

A typical application will be a balanced cantilever construction where many individual tendons need to be defined. Specifying only the first few tendons interactively and then multiplying this basic information for all other tendons will be the most efficient way . It can be observed that working with CADiNP requires a bit more learning at the beginning, but represents one of the main advantages of SOFiSTiK.