In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.
Frequently Asked Questions (FAQ)
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AnswerThis is not possible directly in RFEM, but the RF‑/STEEL EC3 add-on module allows you to create a list of steel parts. In Details of the add-on module, you can specify whether the parts list should apply to all members or only for members to be designed. Then, you can simply carry out the calculation and the parts list will be displayed. It is also possible to export the parts list to Excel and further edit it.
AnswerBoth RFEM and RSTAB provide a suitable solution. For both programs, there are numerous European and international standards as well as various add-on modules that facilitate your daily work in steel construction.
Main Programs RFEM or RSTABThe main programs RFEM or RSTAB are used to define structures, materials, and actions. In addition to the option to create spatial frame and truss structures, such as halls, RFEM also allows for plate, wall, and shell structures, and thus provides a more versatile option. It pays off if it is necessary to also carry out design in other areas, such as solid construction.
- EN 1993-1-1 (Eurocode 3),
- AISC according to ANSI/AISC 360 (US standard),
- SIA according to SIA 263:2013 (Swiss standard),
- IS according to IS 800:2007 (Indian standard),
- BS according to BS 5950-1:2000 (British standard) or BS EN 1993-1-1 (British Annex),
- GB according to GB 50017-2003 (Chinese standard),
- CSA according to CSA S16-09 and CSA S16-14 (Canadian standard),
- AS according to AS 4100-1998 + Annex 1 - 1999 (Australian standard),
- NTC-DF according to NTC-RCDF (2004) (Mexican standard),
- SP according to SP 16.13330.2011 (Russian standard),
- SANS according to SANS 10162-1:2011 (South African standard),
- NBR according to ABNT NBR 8800:2008 (Brazilian standard),
- HK according to the standard Code of Practice for the Structural Use of Steel 2011 (Buildings Department - Hong Kong)
- RF-/STEEL - General stress analysis of steel surfaces and members
Add-on Modules for Steel Structures
The add-on modules complement the functionality of the main programs. For example, RF‑/STEEL EC3, allows you to perform design of steel structures according to Eurocode 3. The RF‑STEEL Warping Torsion add-on module supplements the design according to Eurocode 3 with torsional buckling analysis with up to 7 degrees of freedom, provided it does not refer to a standard case of EC3.
Further specialized application areas, such as plastic design, a stability analysis according to the eigenvalue method, or the generation of geometric equivalent imperfections and pre-deformed equivalent models are available. Stand-alone modules, such as PLATE-BUCKLING, support your design of rigid or stiffened plates. The SHAPE-THIN program allows you to create any thin-walled cross-sections. Thus, the cross-section properties are determined and stress analyses or plastic designs can be performed.
You can design hinged or rigid connections by using the RF‑/JOINTS add-on modules.
The stand-alone program CRANWAY is available for the design of craneways.
If it is necessary to perform seismic analysis or vibration designs of a building, the RF‑/DYNAM Pro add-on modules provide special tools for determining natural frequencies and mode shapes, for an analysis of forced vibrations, a generation of equivalent loads, or for a nonlinear time history analysis.
If you have any question about the Dlubal Software programs, please do not hesitate to contact our sales department.
AnswerThis function cannot be assessed or determined at the basic program level. This issue can be fixed at the level of the add-on modules, such as RF‑STEEL EC3 or RF‑DEFORM. The second module is generic and can be used for any member. More information can be found at: https://www.dlubal.com/en-US/products/rfem-and-rstab-add-on-modules/others/rf-deform .
AnswerThe options for shear panel and rotational restraint are available after activating the stability analysis in Details of the add-on module. The settings of effective lengths and intermediate supports will become available as well.
AnswerThis is a bug that occurred in the version 5.10. In the current versions, it has been fixed. The error was caused by a Windows update that set automatic deletion of temporary files and folders. The program has created a folder to store temporary files or calculated results. Unfortunately, Windows deleted the folder before finishing the calculation. The program had nowhere to store the data and displayed the message: "Write Data() failed of module RF‑STEEL EC3." Unfortunately, the data cannot be restored. To resolve this issue, deactivate the Windows function deleting the unused temporary files or install a newer version of RFEM.
AnswerYou can either define a nodal support or an intermediate lateral restraint in RF‑/STEEL EC3.If there are already nodes in your actual RFEM or RSTAB model, we recommend you to directly enter a nodal support in Window 1.7 as in this case, you can select the nodes directly in the model See Figure 01.If you want to consider intermediate support at a point in the beam where there is no node available in your structure, you can use an intermediate lateral restraint and specify the restraint type (for example, lateral and torsional restraint). See Figure 02.
AnswerIn the examples from the homepage ("cominterfaces-en.zip") there is the following EXCEL file for testing:cominterfaces-de \ SDK \ Examples \ Modules \ Excel \ RS-STEEL_EC3.xlsHere it is possible to get the following results of an example model in the table "Result Design":Last Occasionally,LCross waym
AnswerYou can change the cross-section, generally adjust the model and its loads, or activate stabilization measures in STEEL EC3.The rotatable restraint and shear panel settings defined in window Members 1.12 Parameters or 1.13 Threshold Parameters Parameters, which are then considered in the module-internal eigenvalue solver to determine the contraction load, are particularly suitable for this.
In an older model in RFEM 4 or RSTAB 7, I designed a DuenQ cross-section or general cross-section in STEEL EC3. At that time, a cross-section class 1 or 2 was determined. Now I have opened the model in RFEM 5 and now the cross-section is only classified Class 3 or 4. What is the reason for this? Was the design more economical at the time?
AnswerThe design of general cross-sections or DuenQ cross-sections is always performed elastically in STEEL EC3, which means Since the conditions of interaction are restricted to some cross-sections, no plastic design is possible for any cross-section shapes. In RFEM 4 or RSTAB 7, however, it was possible to classify a cross-section as class 1 or 2, even though the subsequent design was carried out elastically.To eliminate this ambiguity and to create consistency, the classification has also been changed to cross-section classes 3 and 4.
AnswerNo, hinges have to be defined separately in the model. They cannot be generated automatically by RF-/STEEL EC3.
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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.
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