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.
Is it possible to calculate American steel cross-sections?
- Where do I find the setting to specify the entered structural component as a "wall" or "slab"?
- The four plates, identically loaded, show different negative moments at the point of support. Is this a mistake?
- How can I quickly model a chimney with reinforcement rings and stiffeners?
- The protocol lacks information on the limit time for the assessment of fire resistance R in the RF-TIMBER Pro add-on module. Can this information be added to the report?
- How can I model and design general bolted connections with the surface and solid elements in RFEM?
- I get the message "Existing torsion -> no stability design possible." Why does this appear and what can I do?
- I design an asymmetric cross-section and get the message: "Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members." Why?
- How can I consider holes in steel members?
- How can I model a timber-concrete composite floor?
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