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Frequently Asked Questions (FAQ)
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If the cross-section consists of several unconnected partial sections, the sum of the moments of inertia is calculated without the parallel axis theorem components. The cross-section shown in Figure 01 consists of two angle sections that are not connected to each other.
The individual angle sections have the following moments of inertia:
Iy,1,2 = 180.39 cm4 (referred to the centroidal axes y, z)
Iz,1,2 = 65.05 cm4 (referred to the centroidal axes y, z)
The moments of inertia of the entire cross-section result in:
Iy,1+2 = 2 ⋅ Iy,1,2 = 2 ⋅ 180.39 = 360.78 cm4 (referred to the centroidal axes y, z)
Iz,1+2 = 2 ⋅ Iz,1,2 = 2 ⋅ 65.05 = 130.11 cm4 (referred to the centroidal axes y, z)
If the cross-section consists of several connected partial sections, the sum of the moments of inertia is calculated with the parallel axis theorem components. The cross-section shown in Figure 02 consists of two connected angle sections.
The individual angle sections have the following cross-section properties:
A1,2 = 16.25 cm²
yS,0,1,2 = ±2.30 cm (referred to the zero point)
zS,0,1,2 = 3.07 cm (referred to the zero point)
Iy,1,2 = 180.39 cm4 (referred to the centroid axes y, z)
Iz,1,2 = 65.05 cm4 (referred to the centroid axes y, z)
The cross-section properties of the entire cross-section result in:
yS,0,1+2 = 0.00 cm (referred to the zero point)
zS,0,1+2 = 3.07 cm (referred to the zero point)
Iy,1+2 = 2 ⋅ Iy,1,2 + 2 ⋅ A1,2 ⋅ (zS,0,1,2 - zS,0,1+2)²
Iy,1+2 = 2 ⋅ 180.39 + 2 ⋅ 16.25 ⋅ (3.07 - 3.07)² = 360.78 cm4 (referred to the centroidal axes y, z)
Iz,1+2 = 2 ⋅ Iz,1,2 + 2 ⋅ A1,2 ⋅ (yS,0,1,2 - yS,0,1+2)²
Iz,1+2 = 2 ⋅ 65.05 + 2 ⋅ 16.25 ⋅ (2.30 - 0.00)² = 301.46 cm4 (referred to the centroidal axes y, z)
AnswerPrevious program versions can be downloaded from the menu item 'Support and Training' of the Dlubal website (see the Figure). You can find the relevant link below this FAQ.
You have a license of the program SHAPE‑THIN 7 or SHAPE‑THIN 8. Your service contract includes all updates within these program versions.
However, SHAPE‑THIN 9 is a fee-based upgrade. Our sales department will make you an offer for the program switch.
Common cold-formed cross-sections can be modeled in SHAPE‑THIN. In General Data, select the "c/t parts and effective cross-section properties" check box (Figure 01).
Then, select the "EN 1993‑1‑3 (Cold formed cross-section)" option in the "c/t-Parts and Effective Cross-Section" tab of the Calculation Parameters dialog box (Figure 02).
You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3 , 5.2. To do this, select the corresponding check boxes. If the geometric conditions are not met, an error message appears before the calculation.
First, enter the elements of the cross-section. The notional flat widths are usually generated automatically from the geometry conditions, but can also be created as user-defined in Table "1.7 Notional Flat Widths | EN 1993‑1‑3" (Figure 03) or in the corresponding dialog box.
Then, you can define stiffeners in Table "1.8 Stiffeners" or in the corresponding dialog box (Figure 04).
Furthermore, you should specify the buckling panel in Table "1.9 Buckling panels" (Figure 05) or in the dialog box. To do this, select the elements of the buckling panel. The stiffeners located in the stiffened panel are identified automatically.
For the design of a cold-formed cross-section in RF‑/STEEL Cold‑Formed Sections, it is sufficient to define the stiffeners and panels of the cross-section. It is not necessary to additionally calculate the effective cross-section in SHAPE‑THIN. Thus, you can start the calculation and click "OK" to confirm the warning message (Figure 06).
After saving the calculated cross-section, it can be imported into RFEM or RSTAB.
AnswerDimensions cannot be added or deleted in the existing chain dimensioning. The relevant chain dimensioning must be deleted and rebuilt. It is only possible to edit the settings shown in Figure 01, such as an offset and so on.
Whether the download of RFEM or RSTAB is displayed or not in the Download section of your Dlubal Account, depends on whether you have a service contract for the respective product or not.If a service contract has been concluded for the respective product, the links for this product are visible.If no service contract has been concluded, no links are visible.If you purchase RFEM or RSTAB without the service contract at a specific time, you are entitled to use this program version. If you need the download link for the purchased program version, you can download it on our homepage in the "Previous Program Versions" section.See the link to "Download Previous Versions" below.
By using the add-on modules SHAPE‑THIN (thin-walled cross-sections) and SHAPE‑MASSIVE (thick-walled cross-sections), it is possible to model almost any cross-section by entering them graphically, in tables, or by importing a DXF file.For SHAPE‑THIN and SHAPE‑MASSIVE, there are the connection possibilities to RFEM and RSTAB. Thus, the cross-sections can be transferred to RFEM and RSTAB, calculated, and designed in the add-on modules.
AnswerIf you want to modify the individual elements of an inserted cross-section, you can do this in several ways.
1. Selecting another cross-section from cross-section libraryIf you edit the cross-section or select another one, the corresponding elements will be changed as well. Click the "Parametric Input" button to modify the specified cross-section properties.This option is especially useful if you want to keep the base geometry and symmetry of the original cross-section. The sheet thickness and the total height or width can be adjusted very easily in this way.
2. Reducing section to individual elementsIn this way, you can create single, independent elements from the inserted cross-section. Subsequently, they can be edited like the elements created normally.This procedure is useful, for ecample, if you want to change the base geometry of the original cross-section.
AnswerThese cross-section elements belong to an inserted cross-section, and therefore, they cannot be edited individually.
If you want to modify the individual elements of an inserted cross-section, you can do it in several ways:
1. Selecting another cross-section from cross-section libraryIf you edit the cross-section or select another one, the corresponding elements will be changed as well. Click the "Parametric Input" button to modify the specified cross-section properties. This option is especially useful if you want to keep the base geometry and symmetry of the original cross-section. The sheet thickness and the total height or width can be adjusted very easily in this way.
2. Reducing section to individual elementsIn this way, you can create single, independent elements from the inserted cross-section. Subsequently, they can be edited like the elements created normally. This procedure is useful, for example, if you want to change the base geometry of the original cross-section.
AnswerUnfortunately, it is not possible to run any single-user licenses on virtual machines. Licensing is neither possible with the USB dongle nor with a softlock license.The test or trial version of RFEM 5 or RSTAB 8 is a time-limited version that is controlled by a softlock. Therefore, the trial version of RFEM 5 or RSTAB 8 cannot be tested on a virtual machine.In general, it is possible to operate a licensed version of RFEM 5 or RSTAB 8 on a virtual machine. However, you would need a network license for this.The same applies to the test versions of the stand-alone programs SHAPE‑THIN, RX‑TIMBER, PLATE‑BUCKLING, CRANEWAY, and COMPOSITE‑BEAM.More information can also be found in FAQ 002288.
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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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