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Frequently Asked Questions (FAQ)
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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).
Please check the definition of the scissor hinges in the RSTAB 8 file.
To properly consider the function of the scissor hinge, the scissor hinge of the same type must be specified on the member ends of both members ‘touching’ at a node. If this is not the case, you receive the described error message.
If you have got this error message displayed when opening an RSTAB 8 file in RFEM 5, this may lead to problems in the calculation, for example, the structure becomes unstable due to incorrect hinge definition (already in RSTAB 8).
The problem should, therefore, be adjusted either already in the RSTAB 8 file or the RFEM model after import.
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.
The selection in the '1.3 Surfaces' input dialog box within the 'Limitation of Crack Widths' tab has a direct influence on the kc factor for the analytical calculation of the minimum reinforcement As,min for absorbing effects due to restraint according to Equation (7.1), DIN EN 1992-1- 1, 7.3.2.If 'Centrical Restraint' is selected, a kc value = 1.0 is applied in equation (7.1). When applying 'Bending Restraint', the module sets the kc factor strictly to 0.4.If ‘Depending on Defined Load’ is selected, the program interpolates the kc value element by element depending on the stress distribution in the cross-section using the defined load.This results in a constant distribution of the minimum reinforcement from restraint being determined for the respective reinforcement direction of the surface when ‘Centrical Restraint’ or ‘Bending restraint’ is selected. If you select 'Depending on Defined Load', no constant distribution of the minimum reinforcement is resulting from restraint.The program behavior described above is identical in RF-CONCRETE Members and RF-CONCRETE Surfaces (in RFEM 5) and also applies to the CONCRETE add-on module (in RSTAB 8).
This is possible in RF-/FOUNDATION Pro by defining the soil profile.In the input dialog box '1.1 General Data', you can find the button that opens the dialog box for defining the soil profile.In the 'Soil Profile' dialog box, you can then set the PGL altitude and PGL'.Important:The profile of the grade line must not be higher than the profile of the ground elevation.For a bucket foundation, PGL or PGL' refers to the upper edge of the bucket.
If the calculation of the longitudinal reinforcement according to the standard is activated, the required reinforcement content is taken into account when displaying the required reinforcement.See the following graphic with the distribution of the required reinforcement without the minimum longitudinal reinforcement according to the standard:Figure 01 - Distribution of Required Reinforcement Without Minimum Longitudinal Reinforcement According to StandardAnd in comparison, the distribution of As,erf,-z(top) with the minimum longitudinal reinforcement according to the standard:Figure 02 - Distribution of Required Reinforcement Incl. Minimum Longitudinal Reinforcement According to StandardIn the result window '2.4 Required Reinforcement by x-Location', you can see which reinforcement is required at each x-location of the designed member. If the minimum longitudinal reinforcement according to the standard becomes relevant, this is indicated by the message No. 26) or 27).At locations where the minimum longitudinal reinforcement is not critical, only the statically required longitudinal reinforcement is displayed. Messages No. 26) and 27) are missing in this case.
AnswerYes, it is.It is possible to edit the concrete cover in the first row for the direction d1 and d2 and then switch to the cell in the second line and copy the value from the cell above it with the [F8] key.This allows you to edit the values relatively quickly for all connected surfaces.You can also use the button to filter the applied areas to reduce the number of lines displayed. See the link below.
Yes, it is possible. In the input dialog box '1.4 Longitudinal Reinforcement', there is a filter function.If you click this button, only the surfaces connected to the punching points are displayed.
AnswerFor the punching shear design on a column, RF-PUNCH Pro requires a node at which the axial force of the column can be tapped for the design.If you have displayed the column as a solid (for example, with a rectangular cross-section) and directly connect this solid to the floor, you cannot use this situation for the design in RF-PUNCH Pro. The member internal force is missing because only one solid is used.However, you can provide the end of the solid with a short coupling member (for example, a rigid member). Then, the rigid member can be connected to the floor at an end node, and the axial force in the coupling member can be used for the punching shear design.Please note that the dimensions of the coupling member or rigid member need not be defined in the RFEM model. Therefore, the RF-PUNCH Pro applies standard dimensions for the column cross-section.
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.
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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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