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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
The design of cold-rolled steel products is governed by EN 1993-1-3. Typical shapes of cold-formed cross-sections are U, C, Z, Hut, or Sigma sections. They are produced from thin-walled sheet metal by roll-forming or edging methods. When designing the ultimate limit states, it is also necessary to ensure that local load application does not lead to compression, crippling of the web or local buckling in the web of the cross-sections. These effects can be caused by local load application through the flange into the web as well as by support forces at the supported points. Section 6.1.7 of EN 1993-1-3 specifies in detail how to determine the resistance of the web Rw, Rd under local load application.
In RFEM and RSTAB, there are many interfaces available that can simplify the modeling of the structure. From a DXF foil set in the background to the import of IFC objects that can be converted into members or surfaces, to the import of the entire structural system from Revit or Tekla. Regardless of the performance of the selected interface, the further usability also depends on the accuracy of the imported data.
Utilize the RF-/STEEL Cold-Formed Sections module extension to perform ultimate limit state designs of cold-formed sections according to EN 1993-1-3 and EN 1993-1-5. In addition to the cold-formed cross-sections from the cross-section database, you can also design general cross-sections from SHAPE-THIN.
Slender bending beams with a large h/b ratio and loaded parallel to the minor axis tend to have stability problems. This is due to the deflection of the compression chord.
In the following, a pendulum column with a centrally acting axial force and a line load acting on the strong axis will be determined by means of the RF-/STEEL EC3 add-on module according to EN 1993-1-1.
If you read out the results of a surface via the COM interface, you get a one-dimensional field with all results at the FE nodes or grid points. To get the results on the edge of a surface or along a line within the surfaces, you have to filter out the results in the area of the line. The following article describes a function for this step.
In order to consider inaccuracies regarding the position of masses in a response spectrum analysis, the standard EN 1998-1 specifies rules which have to be applied in both the simplified and multi-modal response spectrum analysis. These rules describe the following general procedure: The story mass must be shifted by a certain eccentricity, which results in a torsional moment.
With RF-/STEEL EC3, you can utilize nominal temperature-time curves in RFEM and RSTAB. The standard time-temperature curve (ETK), the external fire curve and the hydrocarbon fire curve are implemented. Moreover, the program provides the option to directly specify the final temperature of steel.
The following article describes how to create a user-defined antenna bracket which will be used in RF-/TOWER Equipment.
In this technical article, a hinged column with a centrally acting axial force and a linear load that acts on the major axis is designed according to EN 1993-1-1 with the aid of the RF-/STEEL EC3 add-on module. Column head and column base are assumed as a lateral and torsional restraint. The column is not held against rotation between the supports. The cross-section of the column is an HEB 360 from S235.
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