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Frequently Asked Questions (FAQ)
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AnswerNo, this is not possible.A member or a set of members is designed as a "structural component" with the model column method.This means that the longitudinal reinforcement is constant over the entire length of the structural component.The design is carried out with the governing internal forces at the governing location of the structural component (member or set of members).A stability analysis with a reinforcement graded via the column in RF-CONCRETE Members (RFEM) or CONCRETE (RSTAB) is possible via the nonlinear design for compression elements.
AnswerThe RF-CONCRETE Columns add-on module uses the model column method with the nominal curvature or the nominal curvature method according to EN 1992-1-1.You can also find more information about the features of RF-CONCRETE Columns on the product homepage by using the following link. See links below.
AnswerIf you are using a 64-bit system and are using the 64-bit version of RSTAB 8 or RFEM 5, there is no program file size limit.The "Limit" is determined by the computer configuration.It may happen that the available random access memory plus the virtual memory defined in Windows (free memory space) is insufficient. In this case, the computer configuration can be optimized (more random access memory, more free hard disk capacity).
Yes, it is possible.You can do this by selecting the check box under "Use Required Reinforcement for Serviceability Design" in the "Longitudinal Reinforcement" dialog box "1.4 Reinforcement".Thus, the module places the entire reinforcement that is required for the ultimate limit state design for the ultimate limit state and / or serviceability limit state into a reinforcement layer.The results output "Additional Reinforcement" is omitted after the design in the results windows in the add-on module as well as in the printout report.The option "Use Required Reinforcement for Serviceability Limit State Design" can be combined with the option "Automatically Increase Required Longitudinal Reinforcement for Serviceability Limit State Design."
This discrepancy is often caused by changing DIN 1054 to EN 1997.In the 'old' DIN 1054, the design was performed by using the characteristic values on the action side and the allowable stress on the resistance side. The actions were used without partial factors and compared with certain allowable stress. In this case, the 'eta' resistance was completely included in the allowable stress.In the predecessor module of RF‑FOUNDATION Pro, which performed the calculations according to DIN 1054, there was a special tab 'Ground Failure Analysis (Service Loads)' for this purpose.In the Eurocode, the ground failure design is performed in a different way.Here, a partial factor is applied to the action and the resistance side. Thus, the loading is increased by the factor of 1.35 or 1.5, and the resistance is reduced by the factor of 1.4.With regard to the 'old standard', the 'eta' resistance is completely included in the 'allowable stress sigma_all'.Under the Downloads link below, you can find a model file for RFEM or RSTAB, which clarifies the problem in RF‑/FOUNDATION or RF‑/FOUNDATION Pro. Here, the design has not been performed by using the user-defined entry of the soil pressure, but using the allowable stresses from the standard case tables. There should be the same soil with approximately the same foundation dimensions resulting or the Eurocode and for the old standard.The following assumptions for the foundation have been made in both add-on modules:
When using the all. soil resistance according to DIN EN 1997‑1 from the standard case tables, the factor of 1.4 is already included. The base values Sigma‑R,d(B) of the soil resistance also differ by the factor of 1.4 compared to the allowable soil pressure 'sigma_all' (DIN 1054).Results of the comparison:Ground failure design according to DIN 1054 in RF‑/FOUNDATION (old):Ground failure design according to EN 1997‑1 in RF‑/FOUNDATION Pro:In spite of different input values, the results from DIN 1054 and EN 1997‑1 are comparable.If you want to recalculate the foundation in RF‑/FOUNDATION Pro, which has already been designed with RF‑/FOUNDATION (old), you would have to apply twice the soil pressure Sigma_R,k:Sigma_R,k (input in RF‑/FOUNDATION Pro) = 1.40 (partial factor for ground failure) x 1.35 (resistance on the load side in the example) x Sigma_all (from RF‑/FOUNDATION (old)).In the attached file, this has been done in CA2 in both add‑on modules. In this case, the allowable soil pressure has been entered as 220 kN/m² in RF‑/FOUNDATION. In RF‑/FOUNDATION Pro, 416 kN/m² has been entered.
- Cohesive soil
- Pure silt - UL
- Stiff consistency
- Embedment depth of the foundation t = 1.50 m
The "Design Details" button is only available or can be selected if the required reinforcement has been selected from the ultimate limit state (ULS).As soon as the governing reinforcement consisting of ULS and SLS or only the SLS is shown in the results tables, the "Design Details" button is grayed out.You can select the design details for the serviceability limit state in Tables 3.1 - 3.3.
AnswerYes, it is possible.A structural model can be provided with a pile foundation in RFEM.Thus, the influence of the foundation stiffness on the actual structure can be simulated very well.Please note, however, that Dlubal Software currently offers no solutions for the design of pile foundations.This also means that the pile resistance must be known to the user in advance. It can not be set in RFEM z. For example, you can calculate them by defining a base structure.The piles can be designed as beam members, for For example, you can model it with a circular cross-section.The resistance of the piles can be realized by entering a member elastic foundation or nodal support at the pile end.The design of the beam could then be carried out in the RF-CONCRETE Members add-on module. However, please note that RF-CONCRETE Members only implements the standards relevant for structural engineering. For example DIN EN 1992-1-1.
The design of a block foundation as well as a bucket foundation with smooth bucket sides is performed by analysing the horizontal components Ho and Hu.
In this case, the restraining moment at the column base is converted into a horizontal component on the upper side (Ho) and on the bottom side (Hu).
For block and bucket foundations with smooth bucket sides, no vertical component is calculated to be used for the design of anchorage.
See Figure 01 and Figure 02.
A different situation is with block and bucket foundations with rough bucket sides. In this case, you can activate the design of the lap length of bucket reinforcement in Details.
In SHAPE-MASSIVE, you can select the "Design" option for reinforced concrete design.In this case, an area of the possible reinforcement diameters can be defined when entering the reinforcement bars. In this defined area, the program can subsequently design a diameter which is in accordance with the bending design.By specifying the concrete cover, it is possible to check whether the designed reinforcing steel diameter can be inserted, or not.Provided the concrete cover was entered too large resp. the required diameter is too large, you will receive an error message after having started the calculation.
The RF-CONCRETE Deflect add-on module is a module extension of RF-CONCRETE Surfaces.The calculation of deformations in state II with RF-CONCRETE Deflect can be activated by selecting the "Analytical Method" in the "Serviceability Limit State" tab in RF-CONCRETE Surfaces.Figure 01 - Serviceability Limit State Tab in the Input Dialog Box 1.1 General Data in RF-CONCRETE SurfacesIn the detail settings, you can activate the option "Deformations with RF-CONCRETE Deflect."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.
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