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Frequently Asked Questions (FAQ)
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A weld must be connected to two elements at its two edges. Otherwise, the message shown in Figure 01 appears.
Element 1, Element 3, and Element 5 are connected at the edges (marked in red) of the weld shown in Figure 02. Therefore, the message shown in Figure 01 is displayed.
It is necessary to modify the cross-section in the way that two elements are connected to the weld (Figure 03). This is also shown in the video.
If you want to display the results at a specific location of the cross-section, it is necessary to divide the element at this location.
To divide the element, right-click it and select the "Divide Element" option in the shortcut menu (Figure 01).
For example, if you want to determine the stress at a distance s = 32.5 mm from the start of Element 1, you have to divide Element 1 at this point. This is also shown in the video.
If you want to calculate stresses in SHAPE‑THIN, it is necessary to create at least one load case. You can create a new load case by using:
- Menu "Insert" → "Loads" → "New Load Case"
- Shortcut menu of the "Load Cases" entry in the navigator
- Entry in Table "2.1 Load Cases"
Furthermore, it is necessary to define internal forces. You can enter the internal forces by using:
- Menu "Insert" → "Loads" → "3.1 Internal Forces" → "Dialog Box"
- Entry in Table "3.1 Internal Forces"
- Import of internal forces from RFEM or RSTAB in Table "3.1 Internal Forces"
After the calculation, you can display the stresses graphically and in tables (Figure 01). This is also shown in the video.
Stiffeners may only contain the elements with a thickness t > 0 mm. If you select null elements (thickness t = 0 mm), the message shown in Figure 01 appears. It is necessary to replace the null elements by the elements with a thickness t > 0 mm.
The stiffener shown in Figure 2 includes Element 8 and Element 3. However, Element 3 has a thickness t = 0 mm, so the message in Figure 01 is displayed. For Element 3, define a thickness t > 0 mm. As an alternative, you can delete Element 3 and connect Element 8 directly to the panel. This is also shown in the video.
If the stiffeners resting in the panel are not defined explicitly as stiffeners, the message shown in Figure 01 appears.
The stiffeners are defined in Table "1.8 Stiffeners" or in the "New Stiffener" dialog box (Figure 02). Specify the elements belonging to the stiffener. In the case of angles, trapezoidal stiffeners, and so on, the stiffener is represented by several elements. If the stiffener represents a cross-section from the cross-section library, it must be divided into the elements first.
The panel shown in Figure 03 includes Elements 1 to 3. Elements 8, 9, and Elements 10, 11 are connected to the panel. However, they are not defined as stiffeners so the message shown in Figure 01 is displayed. It is necessary to define Elements 8, 9, and Elements 10, 11 as stiffeners in Table "1.8 Stiffeners" or in the "New Stiffener" dialog box (Figure 04).
The elements that stiffen a panel at the edges do not represent stiffeners in the sense of a stiffened plate according to EN 1993‑1‑5 , Section 4.5. If the limits of the panel are defined as stiffeners, the message shown in Figure 01 appears. It is necessary to delete these stiffeners.
The panel shown in Figure 02 includes Elements 1 to 3 and Stiffeners 1 to 4. However, Stiffener 3 and Stiffener 4 are located at the edge of the panel (marked in red in Figure 03), so the message shown in Figure 01 is displayed. It is necessary to delete these stiffeners (Figure 04). This is also shown in the video.
The panel has to be supported at the start and the end of it, that means, a support is required here. If this is not the case, the message shown in Figure 01 appears.
If there is a free edge, add the support manually. The support can be specified in Column C and Column D in Table "1.7 Cross-Section Parts for Classification According to EN 1993‑1" or in the "Edit c/t-Part" dialog box (Figure 02).
The panel shown in Figure 03 contains Elements 1 to 3. However, the elements have no support at their free ends (marked red in Figure 04), so the error message shown in Figure 01 appears. The support must be added (Figure 05) to enable the calculation. This is also shown in the video.
Except for RWIND Simulation, all Dlubal Software products use the same dongle driver. Therefore, the one-time update or installation is sufficient, for example.
AnswerYes, the data is freely available. You can download the presentations and finished models by the speakers under Downloads below.
AnswerThe unusual values of shear areas, that is, greater than A, may occur for parametric thin-walled sections, for example, that have an atypical geometry and may not be ideally thin-walled.The shear areas are calculated according to the theory of thin-walled cross-sections in SHAPE‑THIN. Therefore, the defined cross-section should have reasonable dimensions with regard to the width-thickness ratios. The thickness t* of the connecting null element can be used to affect the shear transfer and thus the value of a shear area.
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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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