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Frequently Asked Questions (FAQ)
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In this sense, "EC2 for RFEM" is not an add-on module that you can start separately, but a standard according to which you can design reinforced concrete components, for example in RF-CONCRETE Surfaces or RF-CONCRETE Members.You can find the selection of the design standard in the respective module in the "General Data" dialog box.The same applies to "EC2 for RSTAB".A design standard, here the "EC2", is required in the following add-on modules:- RF-CONCRETE in RFEM 5CONCRETE in RSTAB 8- RF-/CONCRETE Columns in RFEM 5 and RSTAB 8- RF-PUNCH Pro (only available for RFEM 5)
AnswerAs a general solution, RFEM and RSTAB are the ideal solution . In addition to the Eurocode 2 , international standards such as ACI 318 , CSA A23.3, SIA 262 or GB 50010 are available for the design for both programs.
With add-on modules for columns, foundations, or punching designs, you can design structural components quickly and safely.
Basic programs RFEM or RSTABWith the basic programs RFEM or RSTAB structures, materials, and which are impact defined.
For solid construction, RFEM is clearly the first choice , because in addition to the possibility to create spatial frameworks, plates, disk and shell structures can be additionally processed. RFEM is the more versatile option because it can be equipped and extended with the corresponding add-on modules for all materials and designs.
- Eurocode 2 (EN 1992-1-1)
- SIA 262
- ACI 318
- CSA A23.3
- GB 50010
- RF-/CONCRETE Columns
Reinforced concrete design according to the model column or nominal curvature method
- RF-PUNCH Pro
Punching Shear Design of Surfaces
- RF-/CONCRETE FOUNDATION Pro
Dimensioning of single, quiver and block foundations
- RF-CONCRETE Deflect (RFEM)
Analytical deformation analysis
- RF-CONCRETE NL
Realistic deformation analysis on surfaces and members
Dynamic AnalysisIf earthquake calculations or vibration analyzes are necessary for the building, the RF-/DYNAM Pro add-on modules provide suitable tools for determining natural frequencies and shapes, analysis of forced vibrations, generation of equivalent loads, or for the nonlinear time history analysis.If you have any questions about the Dlubal software, contact the sales department
Since concrete has a nonlinear material behavior that can only be simulated with the CONCRETE NL module, it is not possible to analyze it with the RF-STABILITY add-on module.
The use of another material model such as isotropic linear elastic or isotropic plastic would not represent the crack formation correctly and the results are therefore not usable.
A stability analysis on columns can be carried out with RF-CONCRETE Columns or RF-CONCRETE Members. You can find a small example in Downloads.
This example includes the design of a column by the RF-CONCRETE Columns add-on module. Make sure that the calculation of the internal forces in RFEM is performed according to the first-order analysis and that no imperfections are required because the method used in the module takes them into account.
The example also involves the design by means of RF-CONCRETE NL Members. Here again, it is necessary to calculate according to the second-order analysis and imperfections in the form of inclinations are required. For better comparability, the layout of the longitudinal reinforcement was aligned with the result from RF-CONCRETE Columns, as shown in Figures 01 and 02. Since the reinforcement is optimized by the module after a new calculation, the wanted reinforcement was saved as a template (see red arrow).
AnswerThe option controls whether the minimum shear reinforcement based on the dimensions of the structural component for a slab (b/h < 5) or for a beam (b/h > 4) is determined. The height or the thickness of the surface corresponds to h and the smallest edge length of the structural component corresponds to b (see Figure 02).
In RF-/CONCRETE Columns, the column is designed as a 'Structural Component'.When displaying the results 'Bending', 'Shear Force' and 'Bending - Fire Resistance', the maximum value of the design criterion is output as a single value at the governing location (x-location) of the respective design. For example, at the column base, column head, or in the center of the column.If the result display 'Highest Design Criterion' is selected, the maximum value of all design criteria is displayed across the entire 'Structural Component' (column).
RF-PUNCH Pro tries to automatically detect the correct geometry of the node of punching shear from the model input and to specify it correctly.Figure 01 - Wall Corner from Downstand BeamsDepending on the input, it may be necessary to adjust the preset geometry. For example, because a column is recognized instead of a punching shear design on a wall corner. This is possible in the input window 1.5 so that the correct punching geometry can be selected, if necessary.
For this, you can find a setting in the Results navigator for the results from RF-PUNCH Pro.Optionally, you can set the Display navigator to display the result in the form of isolines.
For this, no general recommendation for action can be given.For wall corners and wall ends, the default setting 'Not-smoothed Shear Force Over the Critical Perimeter' can initially be maintained.After the calculation, you can graphically check the distribution of the shear force in the control perimeter.Optionally, you can switch to 'smoothed' (e.g. when singularities occur).Please note, however, that any singularities that may occur are also included in the beta calculation. It may also be necessary that the load increasing factor ß will be specified directly by the user.
AnswerIn RFEM, it is possible to design surfaces and members made of reinforced concrete.Members are designed in the add-on module RF-CONCRETE Members or RF-CONCRETE Columns.Surfaces are designed in the RF-CONCRETE Surfaces add-on module (optionally with RF-CONCRETE Deflect or RF-CONCRETE NL).Reinforced concrete solids cannot be designed in RFEM. There is currently no add-on module for designing the reinforced concrete of solids.However, it is possible to create solids by means of the material 'Concrete' and determine e.g. the stresses within the solid. Optionally, you can insert a result beam into the solid, which is used to convert the results of the solid to member internal forces.The result beam can subsequently be designed in RF-CONCRETE Members or RF-CONCRETE Columns.
AnswerNo, this is unfortunately not possible.If the option 'Tension Stiffening' is not applied for the calculation, the distribution coefficient ζ is either '0' for 'uncracked' or '1' for 'cracked'. See also the technical article for the distribution of the distribution coefficient ζ linked below.But the manual specification of e.g. ζ = 0.5 is not possible.
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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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