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Frequently Asked Questions (FAQ)
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AnswerA collapse or tear-resistance according to DIN EN 1992-1-1, 9.4.1 (3) is not output separately in RF-PUNCH Pro and must be additionally taken into account by the designer.
As soon as at least one member with a circular cross-section is selected for design, A s, top and A s, bottom are no longer displayed.
In this case, it is recommended to create your own design case for the circular cross-sections (in the menu option "File" -> "New Case") so that they are specially designed.
The circular cross-sections should not be selected in the design of the other cross-sections so that A s, top, and s, can be selected from the result navigator at the bottom .
AnswerNo, this is unfortunately not possible.The program concept of RF-CONCRETE Surfaces is designed in such a way that it is always necessary to place a reinforcement on the top and bottom layer.If necessary you can try to concentrate the individual reinforcement layers in the center of the surface. However, it is important to ensure that the individual reinforcement layers do not "touch" each other. Otherwise, an error message appears. See Figure 01.
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.
AnswerWe want to give the user as much freedom as possible in controlling the proofs in RF- / FUND Pro. By default, the relevant verifications according to EN 1992-1-1 and EN 1997-1 are activated when creating a new case.These can be partially deactivated. On the one hand, if proof is not required due to the structural design of the foundation. On the other hand for testing or verification purposes.However, it should be noted that at least one geotechnical certificate according to EN 1997-1 must be activated.
AnswerThe minimum shear reinforcement A sw, min is determined in RF-STANZ Pro using equation 9.11DE from DIN EN 1992-1-1, 9.4.3.The input values used for the determination of A sw, min are output in the result mask "2.2 Required punching shear reinforcement" in the section "Minimum punching reinforcement", so that the calculated value can be reconstructed.It should be noted that the calculated value A sw, min according to the standard refers to the "cross-section of a stirrup leg (or equivalent)". In RF-STANZ Pro, this value is then multiplied by the tangential number of individual rows of hoops, whereby the absolute value of the minimum reinforcement [cm²] in the individual round sections can increase outwardly with increasing length of the round section or increasing number of shackle legs.
AnswerUnfortunately, there is currently no way to export the reinforcement from RF / CONCRETE Members into a CAD format. In RFEM, however, the design results from RF-BETON surfaces can be exported to a DXF file.
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 .
AnswerYou can adjust the units in the RF-CONCRETE Columns add-on module by using the Settings menu.To adjust the unit for the required reinforcement area, change the unit for the "Surfaces".
AnswerIn RF-CONCRETE Members (RFEM) or CONCRETE (RSTAB), the offset is considered by default when determining the provided reinforcement.The difference between required reinforcement with and without offset is displayed when you open the Results navigator window:- A s, -z (top)- A s, + z (bottom)- A s, -z (top), comp.- A s, + z (bottom), comp.display results.In A s, -z (top), comp. and A s, + z (bottom), comp. the offset is included.See Figure 1.For the provided reinforcement in RF-CONCRETE Members or CONCRETE, the program considers the anchorage length for "straight" iron by default. The input can be found in the input window 1.6. See Figure 2.The anchoring length becomes from A s, -z (top), comp. and A s, + z (bottom), comp. determines. Thus, the offset is also included here.
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