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Frequently Asked Questions (FAQ)
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Please select only members with a reinforced concrete cross-section in the input dialog box 1.6 for the design. If selecting members made of steel (e.g.), you will get the corresponding error message.Figure 01 - Message No. 2379 - Invalid Material DataIn case you select 'All Members', the members with a steel reinforcement area are automatically removed from the design.
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 structures e.g. in RF-CONCRETE Surfaces or RF-CONCRETE Members.The selection of the design standard can be taken from the 'General Data' dialog box of the respective module.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 5- CONCRETE in RSTAB 8- RF-/CONCRETE Columns in RFEM 5 and RSTAB 8- RF-PUNCH Pro (only available for RFEM 5)
Since concrete has a nonlinear material behavior that can only be simulated with the CONCRETE NL module, it is not possible to analyze it by using 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.
The stability analysis on columns can be performed with RF‑CONCRETE Columns or RF‑CONCRETE NL. You can find a small example under 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 geometrically linear analysis and that no imperfections are required because the method used in the add-on module takes them into account.
The example also includes the design with RF‑CONCRETE NL. Here, it is also necessary to calculate according to the second-order analysis and it requires the imperfections in the form of inclinations. For better comparability, the layout of the longitudinal reinforcement was aligned with the result from RF‑CONCRETE Columns, as shown in Figure 01 and Figure 02. Since the reinforcement is optimized by the module after a new calculation, the desired reinforcement was saved as a template (see the red arrow).
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.
AnswerIn this case, the Calculation Method and the type of the 2D position are important.When using the analytical method (RF-CONCRETE Deflect), it is possible to perform a calculation in 2D positions. When using the nonlinear method (RF-CONCRETE NL), the calculation for 2D XY (uZ/φX/φY) is not possible. In the nonlinear calculation, shrinkage is represented internally as strain load, which is not possible in this type of 2D position due to the limited degrees of freedom.Convert 2D to 3D PositionIn the general data, it is possible to simply convert a 2D position into a 3D position. For the supports, all degrees of freedom not contained in the 2D position are fixed when converting to a 3D position (see the video).
AnswerIn SHAPE-MASSIVE, the reinforced concrete design has to be activated in the General Data section. As soon as the design is active, it is possible to set the design accordingly in a separate tab (Figure 01).There are three types for the design:Strain-Stress Distribution (Example 01):It is possible to determine an available design ratio by specifying the internal forcesExisting Safety (Example 02):There is determined a state of fracture (ratio = 100%) and a safety in relation to it.Design (Example 03):By specifying a maximum and minimum diameter or a minimum and a maximum reinforcement, it is possible to increase the reinforcement within the design.Irrespective of which of the three methods is used, it is necessary to specify the position of the reinforcement and an acting internal force (Figure 02).
Yes, it is because the CONCRETE module of RSTAB 8 also includes the nonlinear reinforced concrete design. Thus, you can activate the 'Nonlinear Analysis (State II)' in the 'Ultimate Limit State' tab.
In the detail settings for the nonlinear design, you can select the 'General Design Method for Members in Axial Compression acc. to Second Order Theory'.
It is important that you define the imperfections in RSTAB and apply load curves (CO) according to the second-order analysis for the design, no result combinations (RC)!
Note on RFEM 5:
In RFEM 5, the same procedure is possible in RF-CONCRETE Members. However, the add-on module RF-CONCRETE NL in RFEM is required for the non-linear reinforced concrete design.
The RF-CONCRETE Deflect add-on module is a module extension of RF‑CONCRETE Surfaces.The calculation of deformations in cracked sections (state II) with RF‑CONCRETE Deflect can be activated by selecting the "Analytical method of check" in the "Serviceability Limit State" tab in RF‑CONCRETE Surfaces.In the detail settings, you can activate the "Deflection with RF‑CONCRETE Deflect" option.The results from the calculation with RF‑CONCRETE Deflect are then available for the respective design case in the "Serviceability Limit State" tab of the Results navigator.
AnswerPlease note that in the case of a nonlinear calculation, the reinforcement is not increased automatically. The nonlinear calculation is based on the reinforcement already provided. This provided reinforcement can result from the ultimate limit state designs or from the defined basic reinforcement, for example. The reinforcement applied to the SLS designs can be displayed graphically (see Figure 02).Problem Cause:If there is no reinforcement resulting from the ULS or the basic reinforcement in any areas, the serviceability limit state design is carried out without the applied reinforcement, which may cause very high results, for example, of a crack width.Problem Solution:You should ensure that there is the reinforcement available in each area of the structure. This can be done by applying the basic reinforcement (see Figure 03).
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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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