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  • Answer

    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:

    With DICKQ, you can freely define massive cross-sections.

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