In RFEM/RSTAB, the data import from Tekla Structures is started via the [Direct Import] button.
There are two options for importing data.
1. Physical Model
The model is imported as it is represented in Tekla. Information such as supports, hinges and loads is not transferred. This physical model is usually not a valid mechanical model in which all elements are connected in points. Thus, elements whose center lines do not meet in a point or line are not connected.
2. Analytical Model
In Tekla Structures, it is also possible to create an analytical model. There are many ways to transform the physical model into a mechanically correct analytical model. Eccentricities, closely spaced nodes or missing connections can be considered e.g. by rigid couplings. The adapted “line model” refers to the defined axis positions. In addition, Tekla Structures provides the possibility to enter support conditions, hinges, as well as loads, load cases, and load combinations.
RFEM/RSTAB imports all this additional information. Loads can be troublesome because the loads and combinations of Tekla Structures do not necessarily match the RFEM/RSTAB loads. Therefore, the import is currently limited to standard loads and basic load combinations. A general recommendation is to commit the loads to the structural analysis software. Dlubal does not currently import any design criteria from Tekla Structures.
Equal cross-sections are summarized by default in RFEM/RSTAB under one cross-section number. If the model is expected to be summarized “by set of members”, a separate cross-section can be created for each set of members.
The orientation of the global Z-axis is always defined “Upwards” in Tekla Structures. Optionally, the elements can be mirrored about the individual axes of the global coordinate system.
The analytical model in Tekla Structures uses Rigid links to mechanically connect members. RFEM/RSTAB recognizes those special couplings and converts them to the corresponding Coupling member type.
