The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
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In RFEM, it is possible to define a surface of the Membrane type (see the image). The calculation is then done automatically according to the large deformation analysis.
For the modeling of membrane structures, we recommend the Form-Finding add-on (for RFEM 6) or the RF-FORM-FINDING add-on module (for RFEM 5).
Check to see if the material assigned to the members is compatible with the standard selected for the design in the "Concrete Design" add-on.
Furthermore, please check to see if all design properties (durability class, concrete cover, shear and longitudinal reinforcement, and so on) have been specified correctly in the "Edit Member" dialog box.
You can activate the creep and shrinkage to be considered for the concrete design in the Edit Material dialog box (see Image 01).
Once you activate the creep and/or shrinkage for the material, there is the option to define "Advanced Time-Dependent Properties of Concrete" in the dialog boxes for the cross-sections and thicknesses using this material. Select this check box and then define the parameters for the creep or shrinkage in the corresponding tab (see Image 02).
Further information can be found in the chapter of the Concrete Design online manual at the link below.
No, this is not possible in the current state of development of RFEM 6.
See also the FAQ for RFEM 5 and RF‑CONCRETE Surfaces by clicking the link below.The design concept is currently structured similarly and is based on the reinforcement on the top and bottom sides.
To display the interaction diagram, open the "Design Details" dialog box of Concrete Design.
On the left side of the dialog box, you can then select the "Interaction Diagram". Thus, an additional tab called "Interaction Diagram" appears. You can control the settings for the result display here.
Yes, the deformation analysis taking into account the cracked state in the cross-section is included in the concrete design in RFEM 6.
For this, the effective stiffness is calculated for each element in the concrete design according to the existing cross-section state of cracked (state II) or uncracked (state I), and then used in a second FEM calculation for the deformation.
In RFEM 5, this corresponds to the solution in the "RF‑CONCRETE Deflect" add-on module. In RFEM 6, this method is included in the concrete design.
Further information about determining the crack state as part of the deformation analysis can be found in the technical article at the following link.
In the current state of RFEM 6, the user must manually define the shear and longitudinal reinforcement for members. This is considered the "Provided Reinforcement" within the Concrete Design add-on. The add-on calculation will then determine the "Required Reinforcement" needed from the analysis and further output the "Not Covered Reinforcement". The user must manually apply additional reinforcement if the "Required Reinforcement" is not met.
For surfaces RFEM 6 can design automatically the reinforcement.
Design of Surface Reinforcement
It is planned for the future to have an automatic design also of the member reinforcement rather than only the manual input option.
Under the RFEM 6 Concrete Design add-on - Global Settings - Reinforcing Bar - Bar size definition, the default setting "Bar Size Designation" can be changed to "Nominal Diameter". This option will allow the user to set the bar size diameter directly rather than selecting a default bar size from the drop-down.