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Frequently Asked Questions (FAQ)
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For surface supports, this option is only available if a nonlinearity in the local z direction has also been defined (failure if contact stress in z is negative/positive). In the dialog box where you can edit the nonlinearity, there is the option "Friction in plane xy".
This option works as shown in the graphic dialog box: The support in x and y direction is only completely assumed when the contact stress Tau (contact stress sigma by friction coefficient) is reached. Before this is reduced linearly.
In order to use this option, it is necessary to define a support in the horizontal directions. It can be defined as fixed or with an elastic spring. If the spring is defined with 0, no support is considered even when a friction coefficient is entered.
Define a suitable load case to correctly combine the planned prestress with the other load cases and apply a "pulling" strain to the members affected. A pulling strain load can, for. B.
Input via a Longitudinal Displacement is the most comprehensible input because you can directly measure the offset on the turnbuckle of a tension member.
- a negative temperature load T c distributed uniformly over the cross-section,
- a negative change in length ε,
- a negative longitudinal displacement Δl,
- a positive initial prestress V or
- its positive final prestress V only in RFEM.
AnswerThe program RWIND Simulation can be tested as TRIAL for 30 days.
AnswerAccording to the default setting in the program, it is defined that the loads act on all surfaces.However, if there is no surface available in the file, the load can not act and the warning is displayed. If the message is confirmed by clicking "OK," the load is still imported into the model but not applied to any surface. However, as soon as a surface is subsequently defined, the imported loads can act on it.
AnswerThe new standalone program RWIND Simulation provides you with the options for wind simulation and for generating wind loads. The possibilities can be optimally utilized in conjunction with the FEM structural analysis software RFEM or the structural frame analysis software RSTAB .
InputBy directly importing models from RFEM or RSTAB , you can define relevant parameters of the wind directions to be analyzed with height-dependent wind profiles on the basis of a wind standard. This results in the corresponding load cases with globally defined parameters.
Without RFEM or RSTAB, RWIND Simulation can be run manually. For this, the data can be imported from STL vector graphics.
The import of terrain and buildings of the environment into the simulation is also possible from STL files.
By exchanging data between RFEM or RSTAB and RWIND Simulation , you can easily use the wind analysis results as load cases in your familiar RFEM or RSTAB work environment.
Services of RWIND Simulation
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- 3D incompressible wind flow analysis with OpenFoam solvers
- Direct model import of RFEM or RSTAB or STL files
- Simple model changes using drag and drop and graphical adjustment aids
- Automatic corrections of the model topology with shrink wrap interconnections
- Option to add objects from the environment (buildings, terrain, ...)
- Height-dependent velocity profiles according to the standard
- K-epsilon and K-omega turbulence models
- Automatic meshing adjusted to the selected depth of detail
- Parallel calculation with optimal utilization of the performance of multicore computers
- Results in just minutes for low-resolution simulations (up to 1 million cells)
- Results within a few hours for simulations with medium/high resolution (1-10 million cells)
- Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
- Graphical representation of streamlines as well as streamline animation
AnswerNo, this is unfortunately not possible.
AnswerIn CRANEWAY the internal forces are typically displayed only for max and min locations. If you want to get each internal force on each x-location, then you have to run the detailed calculation and to disable the option "Show only governing results". How to do it, we show you in the short video.
Yes, that is possible.First, RF-STABILITY (or RSBUCK in RSTAB 8) can be used to determine the effective lengths for a particular structure and loading.They can then be imported into RF- / TIMBER Pro in the "Effective Lengths" dialog box.
In the main program RFEM / RSTAB, a member rotation of 90 ° is first required so that the lamellas of the glued-laminated beam are upright, see Figure 1.
To also consider the upright position of the beam in the design in the RF- / TIMBER Pro add-on module, increase the resistance for edgewise bending within the parameters set in the National Annex in the tab "Other Settings 2/2", see Figure 2.
When designing general cross-sections in the RF-STEEL AISC module, a "Non-designable" message is given for the design ratio. General cross-sections are defined in the program as user-defined sections or shapes which are not included in the specification. Though, some user-defined cross-sections can be designed under specific conditions. The warning message is displayed because shear buckling is not provided for general cross-section in the AISC 360-16  Chapter G. More info on this topic can be found in the RF-STEEL AISC manual linked below.This warning can be turned off in RF-STEEL AISC add-on module under the "Details" button > Shear Buckling > "Shear buckling warning for general cross-section."
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