back to the main page


Fachwerk3D is the spatial version of the program Fachwerk. It is aimed at structural engineers who analyse and design reinforced concrete structures. It intends to simplify the application of discontinuous stress fields and strut-and-tie models.

The program calculates strut-and-tie models. It only uses equilibrium conditions. Thus, unlike common programs, it does not assume elastic material behaviour.

If the modelled system is statically indeterminate, Fachwerk3D will nevertheless calculate the forces of the members that are determinate. One can assign forces to the remaining members. If more forces than needed to accomplish a statically determinate system are assigned to members, and the equilibrium condition is not fulfilled, Fachwerk3D will indicate that the system is inconsistent.

The current version is 0.4.5 (February 22, 2017).


Less is more

If a statical problem can be solved using a planar model, it is usually better to do so rather than using a spatial model. Three-dimensional strut-and-tie models often need a large number of members and therefore get complex.

Of course there are some cases that justify the application of spatial models, in which case Fachwerk3D may be useful.


A. Vontobel. Contact.