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Frequently Asked Questions (FAQ)
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AnswerYes, this value is taken into account. The internal forces due to prestress can also be output accordingly (see Figure 1).Primary Forces: statically determined percentage of internal forces due to prestressSecondary Forces: statically indeterminate component of internal forces due to prestressTo display the individual parts, you have to create a new result class (RC) where only the reference of the prestress load is selected.
AnswerThe module is designed for prestress in the immediate or subsequent composite. The templates for the tendon geometry are based on parabolic diagrams. This means that the modules are not explicitly designed for the calculation of flat slabs.Possible Figure:The geometric distribution for the free span of the tendon can not be determined automatically by the add-on modules. However, it is possible to use a user-defined tendon diagram as a basis. A prestress without bond could be set by adjusting the friction factors.The deformation analysis can not be performed in the RF-TENDON and RF-TENDON Design add-on modules . However, a deformation analysis on the side of RFEM in conjunction with RF-CONCRETE NL or RF-CONCRETE Deflect and applying the equivalent prestressing loads could be carried out here. The equivalent prestressing loads are exported without influence of long-term losses and would have to be reduced by a factor corresponding to these losses in RFEM.
AnswerRF-TENDON is an external add-on module. While RF-TENDON is running RFEM is locked via COM connection. RF-TENDON is not integrated in RFEM and it runs as a separate application. RF-TENDON should appear in the taskbar after it was started (picture 1)
AnswerThe module RF-TENDON is designed as a module for bars. However, it is also possible to provide surfaces with tendons via the rod type result rod and to dimension them.An example of the dimensioning of a disk is shown in the following webinar:
AnswerThe RF-TENDON module can be opened via the menu bar under Additional modules → RF-TENDON (see Fig. 1). The module RF-TENODN. which serves for the subsequent cross-sectional dimensioning can be opened out of RF-TENODN (see Fig. 2).The modules are only available in RFEM. Both modules are also available in the student version.
When you create a new cross-section in RFEM / RSTAB, you can select different cross-section types in the "Parametric - Massive" category. When the mouse cursor lags a button for a moment, a message appears informing you which add-on modules to dimension this cross-section (see Figure 01).
The cross-sections marked green in Figure 01 can be designed with CONCRETE and RF-CONCRETE Members. However, a "Pi cross-section, type A" is not suitable for the design with CONCRETE or RF-CONCRETE Members. However, as shown in the Info dialog box, RF-TENDON allows you to analyze the cross-section. Thus, you can select this cross-section for a member in RFEM and design it in the RF-TENDON Design add-on module.
Why can not you design all cross-sections in CONCRETE or RF-CONCRETE Members?
This is due to the available reinforcement layers for the individual cross-section types. For example, if you create and dimension a rectangular cross-section, you can find the corresponding reinforcement layer in CONCRETE TEMPLATE 1.6, that is, the possible reinforcement distribution (see Figure 02). Different reinforcement diagrams are possible for a rectangular cross-section. These reinforcement layers are required to determine the stresses and strains in the cross-section and thus the required reinforcement.
For other cross-sections such as Pi cross-sections, this information is not available in the current development state. Therefore, you can not design them with CONCRETE or RF-CONCRETE Members.
If the program DICKQ is licensed, you can create the statical structure with Pi cross-section in RFEM / RSTAB and determine the governing internal forces. In DICKQ, it would then be possible to define the cross-section, import the internal forces from RFEM / RSTAB, and to design the cross-section manually set the longitudinal reinforcement manually.
You can find more information about DICKQ at the following link: https://www.dlubal.com/en-US/products/silitary-section-electroducts/dickq
With DICKQ, you can freely define massive cross-sections.
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