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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.
AnswerBy default, the compute core of the cross-section program SHAPE-THIN is used in the RF- / ALUMINUM add-on module to determine the stresses of the effective cross-section in an iterative procedure. This method is precise because all vertices and edges of the cross-section are considered, but can be very time-consuming for complex sections.Alternatively, it is possible to determine the effective cross-section by means of a simplified analytical method (see Figure 01) that runs much faster. In this approach, corners, fillets, etc. are neglected and subsequently compensated by a factor. No iterative calculation is performed. Therefore, the effective cross-section values may be higher than with the SHAPE-THIN calculation.In such a case, it is recommended to carry out the calculation with the analytical method and then to design only the governing structural component with the governing load combination with the SHAPE-THIN solution.
In RF-PUNCH Pro, the input dialog box "1.4 Longitudinal Reinforcement" shows all surfaces that connect to the selected node for design. 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 box 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. This also includes the walls in the wall corner that you mentioned.However, the definition of the position of the longitudinal reinforcement for these walls does not become relevant for the punching design in the floor slab.Starting with version 5.19.01 of RFEM, a filter has been installed with which you can only display the surfaces for which the definition of the position of the longitudinal reinforcement is relevant.You can find the Filter button in the input dialog box 1.4 on the bottom right. See Figure 01.
AnswerYes, in the 1.2 Layers tab, it is possible to select the "Laminated safety glass" check box.As a result, the design value of the support resistance of the selected material is increased by a factor of 10%.
AnswerIn the Settings for standard (DIN 18008), you can define the design coefficient kc as user-defined.It is indicated with 1.0 in chapter 8.3.6 (DIN18008-1: 2010-12), provided that no other parts of the standard are observed.For particularly for line-supported glazings, the coefficient with 1.8 for normal glasses and 1.0 for prestressed glasses is given in chapter 7.2 (DIN18008-2: 2010-12).
I have a foundation that is supported by adjoining frost aprons (breaker bars) in one direction (X- or Y-direction). From the determination of internal forces in RFEM, I receive horizontal support forces in X- and X-direction. This is also correct. Due to the frost aprons, the foundations are supported in X-direction. Can I "switch off" or not consider a support reaction from RFEM for the foundation design in RF- / FOUNDATION Pro?
AnswerYes, this is possible.You can find the control in the design details of the respective design case in RF- / FOUNDATION Pro.On the one hand, you can select the Support Load (Px, Py, Pz, Mx or My), which should not be taken into account in the design. On the other hand, you can also decide if forces or moments should only be deactivated for a certain direction or for all directions.However, it is important that the deactivation of the support load is effective for all designs of the design case. If you want to deactivate the support load Px only for the design of sliding, but not for all other designs, you can control it with two design cases.
AnswerWe would like to give the user as much freedom as possible when controlling the designs in RF- / FOUNDATION Pro. By default, the relevant designs according to EN 1992-1-1 and EN 1997-1 are activated when creating a new case.Some of them can be deactivated. On the one hand, if a design is not necessary due to the structural design of the foundation. On the other hand, for testing or verification purposes.Please note, however, that at least one geotechnical design according to EN 1997-1 must be activated.
AnswerThe static height d for the proof "bending resistance safety equivalent beam" is given by the plate thickness minus the set concrete cover on the underside of the block foundation, the diameter of the regular bending reinforcement of the plate on the underside in both directions and half the diameter of the reinforcement of the "replacement beam".The static height d is taken into account differently in both directions (bending around the x and the y axis). This must be taken into account when evaluating the calculation in the result table 2.2 "Essential proofs - resistance to bending damage - replacement beams".
Ultimate limit stateSLS:
Serviceability limit state
EQU:Design of the structural safety; Loss of structural security of the structural system or one of its parts, for example By tilting, floating or liftingSTR:
Failure of structural system or parts due to exceeding of material strength, excessive deformations, reaching kinematic state or unstable positionGEO:Extensive deformations or failure of the soil
AnswerIn order to carry out a fire protection certificate in STEEL EC3, you must select a load case or a load combination in the "Fire protection" tab for which the fire protection certificate is to be carried out.As soon as you have selected a load for the fire protection certificate, an additional mask "Fire protection bars" or "Fire protection - Rod sets" appears in the module navigator on the left (if rod sets are to be dimensioned in the module case). In this screen 1.10 or 1.11 further settings for the fire protection proof of the component can be set.Further detail settings (eg. example required duration of fire protection, etc.) can also be found by pressing the [Details ...] button and selecting the "Fire protection" tab.Further information can be found in the manual for STAHL EC3.
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