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KB 001490 | Modelling Options for Composite Cross-Sections
First Steps with RFEM
In RFEM, there are different options to model composite cross‑sections. In the following example, three different modelling options for a composite cross‑section, consisting of a rolled steel section HEA 300 and a rectangular cross‑section made of concrete w/l = 100/30 cm will be displayed and explained.
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Models to Download
Knowledge Base Articles
Concrete on its own is characterized by its compressive strength. To have reinforced concrete, the participation of reinforcing steels contributes to it thanks to their resistance capacity both in compression and especially in traction.
Product Features Articles
The material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows softening of the material, which can be different in the local x- and y-direction of a surface. The material model is suitable for (unreinforced) masonry walls with in-plane loads.
Frequently Asked Questions (FAQ)
- How can I get the member end forces to design the connections?
- I often edit the reinforcement provided by the program. Adjusting the reinforcement by using coordinates takes much effort and time if having several beams in the model. Is there any way to speed up the reinforcement editing?
- Which filter settings should be selected in the material library for concrete in order to perform design in RF‑CONCRETE according to the Swedish National Annex? In RFEM, there is no Swedish standard group available for the selection.
- What is the best way to consider steel fiber reinforced concrete with the structural analysis program RFEM?
- How is the position of the additional reinforcement considered in RF‑CONCRETE Surfaces when determining hc,ef?
- How is the support spring calculated for a wall?
- I would expect the results from my load combination (CO) set to a linear analysis to equal the summation of the results from my load cases (LC) also set to a linear analysis. Why do the results not match?
- A rigid member should only be able to absorb tensile forces or only compressive forces. What are the options for considering these nonlinearities in the calculation?
- Does a user-defined layer composition in RF-LAMINATE need to be shared separately with other users along with the RFEM model file or is this information stored directly in the RFEM file?
- In a 3D model consisting of three identical floors, I applied a unit load of 1 kN/m² to the top slab to determine the spring stiffness of the supports for 2D modeling of the slabs from normal forces and deformations of the columns. Despite the deactivation of the self-weight of the structure, there is a redistribution of the column normal forces by storey. Is it possible to deactivate this effect?