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Frequently Asked Questions (FAQ)
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AnswerAfter running a calculation, you can view the member internal forces under Table 4.6 Members - Internal Forces. The tools at the top of the table include a filter function. Under the detail setting for the filter, you can turn on/off the internal force values for the start of members, internal points, or end of members. For connection design, the start of members and end of members will be most of interest. This information can additionally be exported to Microsoft Excel with the direct link in the table options.For additional information on the filter options, refer to the RFEM Online Manual 11.5.5. Filter Functions.
Both RFEM and RSTAB can be used as a basis for the analysis of structures in flight. For both programs, standards are available with which you can calculate and design steel, aluminium and lightweight structures. If membrane and cable structures are also to be designed, RFEM is required.
Main Programs RFEM or RSTAB
The main programs RFEM or RSTAB are used to define structures, materials, and actions.
In order to also analyze membrane and cable structures, RFEM is required. When it comes to pure beam structures, it is sufficient to purchase RSTAB. In any case, RFEM is more versatile it can be equipped and extended with the corresponding add-on modules for all materials and structural models.
- RF-/ALUMINUM according to Eurocode 9 (EN 1991-1-1: 2007)
- RF-/ALUMINUM ADM according to ADM 2020 (US code)
- RWIND Simulation
Complex analysis of any structures in the digital wind tunnel with the transfer of load cases to RFEM or RSTAB for further processing
Dynamic AnalysisIf 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.
- Building Information Modeling (BIM)
An extensive collection of interfaces allows for data exchange with other programs.
If you have any question about the Dlubal Software programs, please do not hesitate to contact our sales department.
This design can be performed in the RF‑/JOINTS Steel - Column Base add-on module.
Select the joint type in Window "1.1 General Data," see Image 01.
After entering further parameters, you can define the friction coefficient μ in Window "1.5 Column," see Image 02.
A drilling can be performed with a surface model. For this, it is first necessary to split the member (the finer is the division, the more accurate is the result) and then generate surfaces from it.
The resulting cross-section outlines can then be easily rotated. Please note that the cross-section shortening is not taken into account. The RF‑IMP add-on module provides more accurate results as it can pre-deform the FE mesh.
According to DIN EN 1993‑1‑1, Section 6.2.9, the moment resistance is reduced due to a high axial force utilization, thus the maximum design ratio for the cross-section design "biaxial bending, shear and axial force according to 6.2.10 and 6.2.9" is unusually high.
If using Equation (6.2) from Section 6.2.1 for the cross-section design instead of Equation (6.41) from Section 126.96.36.199, the design ratio can be reduced significantly.
In the RF‑/STEEL EC3 add-on module, you can activate the linear interaction of the axial force and moment loading in the Details tab, see the image.
The RF-/STEEL Warping Torsion module extension is available in RFEM and RSTAB
For this, the RF‑/STEEL EC3 or RF‑/STEEL AISC add-on module as well as the corresponding license for the Warping Torsion module extension are required.
If these requirements are met, the module extension can be activated as shown in the following figure:
For more information about RF‑/STEEL Warping Torsion, see the product description.
In order for the program to calculate the failure due to tension, the "Net Cross-Sectional Area" function must be activated in the "Parameters - Members" window.
Yes, it is possible. The Intermittent weld seam option is suitable if the weld seam between the crane rail and the flange is not continuous. A parallel opposing arrangement is assumed. After you select the check box, you can specify the length of the weld seam and the interruption. These specifications are considered in the design.
On our website, you can also find an interesting technical article about "Ultimate Limit State Design of Rail Welds of Crane Girders According to EN 1993-6."
AnswerIn the SHAPE‑THIN stand-alone program, it is not possible to calculate the c/t-field for rounded elements entered in the cross-section. If you replace all arc parts in this cross-section, calculate the cross-section, save it, and import it into RFEM again, the design will be possible.
In most cases, slender beams receive a parabolic shear stress in the web of the cross-section, which has the maximum value in the centroid of double-symmetric cross-sections.
According to DIN 18800, Part 3, Section 403, the following applies:
Shear stresses that are variable over the width b of the buckling panel should be considered with the larger of the following two values:
- Mean value of τ
- 0.5 max τ
In this case, the mean value of the shear stress is used for the buckling design.
Since the variable shear stress τz depends on the statical moment Sy, there is a table with the details of the c/t-parts of the cross-section in FE‑BUCKLING. This also includes the average statical moments which are used to determine the corresponding shear stresses for the buckling design according to the usual formula, but with the average statical moment, see the formula and Image 01.
Accordingly, the following shear stress results in FE‑BUCKLING, see Image 02.
The respective statical moments that are used to determine the shear stresses in RF‑/STEEL for the stress analysis can be displayed in the result window by clicking the "Show Cross-Section Values and Extended Stress Diagram" button, see Image 03.
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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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