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Frequently Asked Questions (FAQ)
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AnswerInstability is caused by the fact that all member, which have a hinge at the member end, converge in one node. This means that the node can rotate freely. It is necessary to connect at least one member to a node without a hinge.
You could also solve this problem by setting a certain small stiffness at the hinge so that it is not freely rotatable. In that case, there can be hinges on all members at the node.
A result of the column design with RF‑CONCRETE Columns is the provided reinforcement. This is displayed in Table 4.1 and illustrated in the graphics below and in the table on the right.
You can use the "Edit Reinforcement" button to change the provided reinforcement, if necessary. Click the button to open the "Edit Longitudinal Reinforcement" dialog box (see the image). It includes the table for the "Position of Reinforcement Bars." Here you can delete rows by selecting the row that contains the member to be removed and then clicking the button below.
Subsequently, it is necessary to recalculate the design for the modified reinforcement layout.
The described procedure is shown in the explanatory video.
In RF‑CONCRETE Members, you can select the option to consider a precamber due to temperature gradient under the "Fire Resistance" tab in Window "1.6 Reinforcement."
For the calculation, the program internally creates a member load as precamber of the cross-section.
However, the result beam is a virtual member that does not have any stiffness nor consider any support, which is not suitable to absorb loads. Therefore, an error message appears when starting the calculation as soon as the precamber due to temperature gradient is selected in RF‑CONCRETE Members for the design of result beams.
If the model contains members with elastic foundations, the contact forces and contact moments are displayed numerically in Table 4.7.
To control the graphical display of results, select the Members check box in the Results navigator.
Yes, the load can be entered in RFEM as a surface load. In the Edit Surface Load dialog box, you can find the Generate Load due to Shrinkage... button. This allows you to obtain the internal forces due to shrinkage.
In order to consider the shrinkage in the RF‑CONCRETE Surfaces design, it is not necessary to enter a load. The RF-CONCRETE Surfaces add-on module automatically apply the loads due to the shrinkage.
The elements that overlap partially or entirely in their lengths can be found by using the model check for overlapping elements. To open the model check, use the menu Tools → Model Check → Overlapping Elements.
If overlapping elements are detected, they are shown in a dialog box where they are sorted by groups. In the work window, the current group is indicated by an arrow (Image 01).
The element pairs can be exported to MS Excel or created as a visibility. The visibilities created in this way (Image 02) can be quickly used to find and delete the relevant elements in the cross-section.
After creating a model with the model generator, it is not possible to adjust the model retrospectively by using the model generator.
However, it is possible to save the dialog input of the model generator as a template and use it later again. In this way, you can adjust the imported template and thus generate a new model. Image 01 shows how to save it and Image 02 how to import the generator data.
AnswerThe problem is caused by different result smoothing. In this case, you have set the interpolation by the individual surfaces, so the values are interpolated regardless of the adjacent surface.
AnswerThe information about 15 minutes for the fire resistance can be switched on in the printout report by using the Edit/Select menu, where you can select the Details section of RF‑TIMBER Pro (because the fire resistance class is specified in the Details dialog box).
In RFEM, built-up sections called Castellated Beams are available in the cross-section library. They allow you to place openings in the web of sections such as W-shapes for example. The layout of the openings is parametric where the diameter and spacing can be adjusted. These cross-sections can further be designed in the RF-STEEL AISC add-on module.
You can then set separate cross-sections for the start and end of the member allowing you to create a tapered section.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures 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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