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Frequently Asked Questions (FAQ)
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AnswerUnfortunately, the add-on module RF-CONCRETE Surfaces for RFEM 5 is not designed for the design of sandwich elements. Therefore, there are no essential designs for structural components like For example, the shear joint check. Regardless of whether it is a wall or a slab.The bending design, and in particular the check of the shear force resistance, is designed for constant cross-sections.You can model the sandwich elements as surfaces with a constant thickness and perform the design in RF-CONCRETE Surfaces. If necessary Additionally required designs would have to be performed separately.
You can realize such a connection with a line release. Figure 1 shows an example model where wall 1 should transfer only compressive forces to wall 2.
First, the dialog box for creating a line release is opened (fig. 2). In the dialog box (Fig. 3) Now select the lines for release and type. The Type must also be created. The coordinate system of the line specifies the direction so that "If vy positive" must be selected as release (Fig. 4).
Figure 5 and 6 show in two load cases, how the line release works.
AnswerIf you only want to transfer the wind loads on the gable over the columns and not via the girder, you can deactivate it in the settings of the load generator by using the setting "Correction of generated loads" (see Figure 1).
AnswerRF-PUNCH Pro uses the support forces only for the punch supports for nodal supports.For the punching shear design on wall corners and ends, the member behavior is not used as the support force from the line supports but as the shear force in the critical perimeter. This has the advantage that a punching load can also be determined if a wall was entered in a 3D model instead of a line support. Thus, this approach in the add-on module is more general and can be applied regardless of the type of modeling.You can also find additional information about determining the punching load for wall corners and wall ends in an article on our homepage that you can open by clicking the following link.
In RF-PUNCH Pro, RFEM displays all surfaces connected to the selected nodes for input in the "1.4 Longitudinal Reinforcement" dialog box. For example, in a punching shear design on a wall corner, the surfaces that actually represent the walls are also defined. I can also define a longitudinal reinforcement for these surfaces. Is this somehow applied? Why do I see these surfaces in the dialog 1.4?
AnswerYou are right. In the input dialog box "1.4 Longitudinal Reinforcement", we first display all surfaces connected to the selected node for design. That means also the walls at the wall corner you mentioned.However, the definition of the position of the longitudinal reinforcement for these walls does not become relevant for the punching shear design in the floor slab.Starting with version 5.19.01 of RFEM, a filter has been installed with which only the surfaces for which the definition of the position of the longitudinal reinforcement is relevant can be displayed.You can find the Filter button in input dialog box 1.4 on the bottom right. See Figure 01.
I have a foundation, which is held by subsequent frost aprons (Zerrbalken) in one direction (X or Y direction). From the internal force determination in RFEM I get horizontal bearing forces in the X- and X-direction. This is correct so far. Due to the frost aprons, the foundations are stored in the X-direction but. Can I "switch off" or ignore a bearing response from RFEM for the design of the foundation in RF- / FUND Pro?
AnswerYes, this is possible.You will find the controller in the design details of the respective design case in RF- / FUND Pro.On the one hand, you can select the bearing load (Px, Py, Pz, Mx or My) that should not be taken into account in the design. On the other hand, you can also determine whether the forces or moments should only be deactivated for a specific direction or for all directions.It is important, however, that disabling the bearing load works for all proofs of the design case. If the bearing load Px is to be deactivated only for the proof of sliding, but not for all other checks, then you can control this with two design cases.
AnswerWe are sorry, but the program DICKQ is currently not available as a student version.
AnswerIn RF-CONCRETE Surfaces, the "top" or "bottom" position is controlled by the orientation of the area's local coordinate system.See also the FAQ000740This means for a wall that As, below or As, above can either be the reinforcement on the outside or inside depending on the orientation of the local z-axis.Both values must be taken into account for the reinforcement planning.So the sum of A s, below + A s, above .
Depending on the selected load determination type, RF-PUNCH Pro determines the punching load from the shear forces in the critical control perimeter. The internal forces in surfaces from the RFEM model are used here.
If the FE mesh in the area of the punching node is not fine enough, the results may be inaccurate. In this case, you get message no. 56.
To avoid the problem, you should perform an FE mesh refinement in the RFEM model in the area of the punching node . You can arrange them either directly on the node or on the connecting lines of the wall ends or wall corners.
If the FE mesh refinement is sufficiently fine, the warning message disappears automatically after a recalculation in RF-PUNCH Pro.
Usually, it should be completely sufficient to only provide the ceiling slab with line supports. The rib as a T-beam is already a fixed part of the ceiling anyway.
If you still want to support the member with a nodal support accordingly, you could split the line just before the rib and remove the line support on the rest of the piece. By using this method, a warning message is not displayed during the calculation since both the nodal support and the line support are available on the node at the same time.
Find some interesting articles on the topic "downstand beam" on our website (see Links below).
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