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Frequently Asked Questions (FAQ)
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The reason for this warning might be overlapping surfaces, which can occur when for example one solid is modeled onto another, see figure 1.
In order to avoid overlapping surfaces, an opening is required here. After defining that opening, also check if the definition of the solids have to be corrected.
AnswerIn RWIND Simulation, it is possible to adjust the model position and the model rotation manually. To do this, simply select Model → Edit in the navigator and then the desired rotation angle in the Position tab. In this case, the rotation is carried out without changing a displacement.
AnswerIn most cases, the problem is that in the edge area of the cushion, the finite elements of the cover surfaces are very close to each other when Bezier surfaces have been used. The FE mesh nodes of the bottom and top surface may then be combined. The FE mesh nodes of the bottom and top surface may then be combined.1. Numerical correction of the problem:You can adjust the tolerance for combining FE mesh nodes via the menu 'Tools' → 'Regenerate model'.2. Solving the problem geometrically:The more reasonable solution is to increase the distance between surfaces by edge surfaces, as shown in Figure 01.
AnswerWhen using the COM interface (RS-COM or RF-COM), it is possible to create a comment through the guide object interface (IGuideObjects). The following is an example program that sets a comment:Sub test_comment()' get interface from the opened model and lock the licence/programDim iModel As RFEM5.IModel3Set iModel = GetObject(, "RFEM5.Model")iModel.GetApplication.LockLicenseOn Error GoTo eDim iModelData As RFEM5.IModelData2Set iModelData = iModel.GetModelDataDim iGuiObj As RFEM5.IGuideObjectsSet iGuiObj = iModel.GetGuideObjectsDim comm As RFEM5.Comment' set frame typecomm.Frame = CircularFrameType' set reference object typecomm.ObjectType = GeneralObjectTypecomm.ObjectNo = 1' set point if GeneralObjectType is choosencomm.Point.X = 2comm.Point.Y = 4comm.Point.Z = 6' set offset from reference objectcomm.Offset.X = 0.5comm.Offset.Y = 1comm.Offset.Z = 1.5comm.Rotation = 1' set text of commentcomm.Text = "testcomment"' transfer object to programiGuiObj.PrepareModificationiGuiObj.SetComment commiGuiObj.FinishModificatione: If Err.Number <> 0 Then MsgBox Err.description, , Err.SourceSet iModelData = NothingiModel.GetApplication.UnlockLicenseSet iModel = NothingEnd SubThe selection of the reference or the element to which the comment is considered to be attached to is first defined by the type (ObjectType). Here, it is possible to select e.g. a member, a node or any point in space. Next, the number of the reference object is specified via ObjectNo (e.g. member 1). If a free point has been selected, it is set by Point.Finally, an offset can be specified, which results from the reference object.
Yes, it makes because this affects the stiffness of the entire system.
When entering a level-floor downstand beam as a ‘Rib’, you will add the stiffness of the defined rectangular cross-section to the area of the line.
For the result beam, however, you have only to define the integration width. The entered rectangular cross-section does not influence the stiffness of the entire system but is only applied as a design cross-section in the add-on modules (e.g. RF-CONCRETE Members).
AnswerA thread cannot be created using a function in the program. In such a case, you have to create this geometrically via nodes and lines. In the program, there is an option to create the windings through trajectory surfaces. However, you have the option to reach your target relatively quickly when using Copy and Rotate.
You can connect a rib member to a line on two surfaces with different thicknesses.
To determine the stiffness or internal forces, the eccentricity of the rectangular cross-section is determined using the mean value of both connected surfaces in RFEM.
For designing in RF-CONCRETE Members, the add-on module determines its cross-section, which is displayed in the input dialog box ‘1.4 Ribs’ of the add-on module.
By clicking the ‘i’ button (see Figure 02), it is possible to open an info dialog box for the generated rib cross-section, where all cross-section properties applied for the design in the module, like the position of the shear center and centroid, etc., can be viewed.
If the ‘Effective Width’ is adjusted in the ‘1.4 Ribs’ dialog box (e.g. to 0.50 m) this has influences on the cross-section applied in RF-CONCRETE Members and its cross-section properties.
However, this does not influence the stiffness or the determination of internal forces in the 3D model in RFEM.
AnswerThe easiest way to find a member is to select Project Navigator - Data. Here, right-click the members and select "Find Members." Now you can enter the member number and the member is marked with an arrow in the graphic.
AnswerNo, this is not possible.The member elastic foundation is basically constant over the length of the member.If you want to enter a variable member foundation based on the height of the bored pile, you have to divide the bored pile into individual members and specify different constant foundations on the individual members. Thus, the linear distribution of a foundation can be approximately simulated.
The drag & drop function is very helpful for fast work in RSTAB and RFEM. This option must first be activated in the shortcut menu (Figure 01).
If you click a member or a line near the start or end node in the work window, you can quickly define the new connection point graphically.
However, if you grab a member or a line in the middle third, you can simply move the element to a new position.
If you additionally press the 'Ctrl' key, the marked elements are copied.
The video first shows how to move the column head of member 2 from node 2 to node 4. Then it is shown how the member 2 is moved to a new position.
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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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