RIB Structural engineering


Digital Structural Analysis

iTWO structure for BIM Model Integration in Engineering

BIM Model Integration
in Structural Engineering

iTWO structure provides the structural engineer with a very flexible BIM model transfer: Both the CPIXML* format and IFC formats are supported. In addition, data can be used via integrated interfaces to other CAD systems and software from manufacturers. The components for iTWO structure fem are currently being developed. A direct integration for Autodesk Revit is available there as a plug-in.

* proprietary RIB iTWO exchange format


Model Transfer via Revit-PlugIn

Our Revit-PlugIn allows the direct transfer of component information for analysis models to iTWO structure fem. The model information can be transferred for individual floor slabs as well as for the entire system. These form the basis for the subsequent model-based conversion into a finite element model for numerical simulation. Unique IDs always guarantee the assignment of the model information to the finite element components in iTWO structure fem.

Data Transfer to CAD Systems and Manufacturer Software

iTWO structure fem supports versatile options for a direct data transfer to other CAD systems by passing on design information (Allplan, STRAKON, etc.) In addition, software components installed by manufacturers (Schöck, Halfen, Filigran, etc.) can be directly accessed from the program environment and supplied with result data from the FE system. Thus iTWO structure fem becomes an overall interconnected program system.

Coordination of geometric models via IFC

The IFC interface for the ZEICON engineering CAD system supports the data exchange from digital building models in civil engineering via IFC files (Open BIM), which contain component information in an open standard. When importing or exporting (from V20 on) the IFC data, a direct assignment to the components known in ZEICON is made from the geometry description. On the basis of the existing model information, the design drawings for the components can be created after the calculation and dimensioning of the structure.


iTWO structure FEM
Concrete Slab Entry

Entry package structural slab with iTWO structure fem base, slab and GZT-NW concrete in building construction


iTWO structure FEM
Concrete Slab

Basic package structural slab with iTWO structure fem base, slab and GZT-NW concrete in building construction


iTWO structure FEM
FEM Concrete Slab Package PLUS

Expert Package Concrete Slabs for BIM Integration
Slab, Revit Plugin2FEM, ULS/SLS transformation condition II for concrete in building construction


Further Information


Presentation on
Fair DigitalBAU 2020

Note on the product lines RIBTEC and abacus for structural engineering

With its powerful software solutions, RIB Software GmbH has shaped structural engineering for more than six decades and achieved a high level of acceptance. The unsatisfactory business situation in the field of structural engineering in recent years gives us reason to fundamentally rethink our involvement in this area of activity. After careful consideration of the current situation, we have decided to phase out the RIBTEC (structural and geotechnical member design, FEA for buildings and bridges, CAD and iTWO structure) and abacus product lines at the end of 2024.  

A final version is planned for the year 2024. Until Wednesday, 20.12.2023 there is the possibility to purchase new and/or subsequent licenses for the current version 23 including this final version or to update for this version status.

In this context, we would like to emphasize that this decision will not have any impact on other RIB products. Instead, we will focus more on the further development of our other product portfolio in order to be able to continue to offer you innovative and powerful software solutions in the future. 

We will be happy to answer any questions you may have. Please contact your usual contact person in structural engineering, our service team or our division online via [email protected]. You can also reach us by phone at 0711-7873-157 in Stuttgart.  

We would like to thank all users and participants in the field of structural engineering for their loyalty and commitment over many years, in many cases even decades, and hope for your understanding for this severe decision. 

Professional software for
structural engineers

Integrated solutions are essential in times of tight schedules and scarce resources. Therefore, RIBTEC offers various synergies in calculation, design and construction. You benefit from a time-saving data flow in the sense of Building Information Modeling (BIM) in the overall process of structural design.

RIB's software solutions for structural engineers range from structural, building and ground engineering as well as finite element calculations to tunnel and bridge construction and the drawing of formwork and reinforcement plans.

RIB has been developing pioneering solutions for structural design and FEM since 1961. The RIBTEC programs are successfully used by over 5,000 engineering offices, inspection engineers, construction companies and planning departments in the public and industrial sectors. With more than 100 structural analysis programs, RIBTEC comprehensively covers the practice of structural design.

 iTWO structure

Model based Integration - BIM for Structural Engineering

RIB emphasizes the continuous support of a real BIM 5D workflow and develops iTWO structure within the iTWO family, a solution to fully exploit the potential of BIM especially in structural engineering.


Contact sales structural engineering

+49 711 7873-157
[email protected]


Structural Engineering

Richard Stasch
+49 711 7873-41
[email protected]

Contact & Hotline

Solutions for structural engineering and test engineers

For questions on events

Support for structural engineering