In general, a distinction is made between the following relative stiffnesses:
- Bending stiffness
- Torsional stiffness
- Shear stiffness
- Strain stiffness
Stiffness Types in RFEM
- Standard (isotropic surface)
- Without membrane tension (like Standard but failure of membrane stiffness under tension)
- Orthotropic (orthotropic surface, different stiffnesses in the x- and y-direction of finite elements)
- Glass (for surfaces made of glass, created by the RF-GLASS add-on module)
- Laminate (laminate theory, created by the RF-LAMINATE add-on module)
- Rigid (surfaces with very high stiffness)
- Membrane (surfaces with membrane stiffnesses only)
- Membrane - Orthotropic (different membrane stiffnesses in the x- and y-direction of finite elements)
- Null (surfaces will be ignored in the calculation, necessary for solids)
Since wind on laterally open structures is not addressed in the Eurocode, the 4 cases of the German DIN 1055 Part 4 are referenced.
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.
- How can I model a timber-concrete composite floor?
- When calculating a cable using the STEEL EC3 add‑on module, there is the error message "Incorrect characteristic stresses for material No. 1! Please correct this in Table 1.2."
How can I retroactively reduce the determined existing longitudinal reinforcement in RF CONCRETE Columns?
- I have a modeled wooden building, which I took over from Scia Engineer from a former colleague and adapted it into the RFEM program. The models should be the same, but in Scia Engineer the model can be calculated, while in RFEM the model reports my singularity. How do I modify the model to work?
Is it possible to specify shrinkage effects as loads?
- Are effective length factors determined automatically from a model in the add-on modules for the aluminum and steel design or do I have to make adjustments?
Which units are specified in the result display of the support reactions (kN or kN/m)? A note about this is missing in the graphic.
In the case that the support reactions are given in kN/m, for which distance does the value apply?
- I design a cross-section created in the SHAPE‑THIN program by using the RF‑STEEL EC3 add-on module, but the program shows the error message "ER006 Invalid type of c/t-part for cross-section of type General." What can I do?
Is it possible to calculate with American steel cross-sections?
- Where do I find the setting to specify the entered structural component as a "wall" or "slab"?
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Design of single-layer, laminated and insulating glass
Deflection analysis and stress design of laminate and sandwich surfaces