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  • 回答

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  • Which resources are available to perform the pushover analysis?

    FAQ 002258 ZH Add-on modules RF-DYNAM Pro RF-DYNAM Pro - Equivalent Loads RFEM

    回答

    In RFEM, it is possible to calculate a pushover curve (also called capacity curve). The pushover curve data can be exported to Excel. Important steps in order to evaluate this nonlinear curve are listed below:

    1. Comprehensive definition of nonlinear hinges
      1. Plastic hinges in accordance to FEMA 356: This is a nonlinear hinge (elastic‑plastic or rigid‑plastic) with default values for yielding points in the hinge diagram and acceptance criteria, both for steel members (Chapter 5 in FEMA 356). The yielding limits of the members are dependent on the cross‑sections and are set automatically. For moment hinges, the diagram parameters and acceptance criteria are interpolated for different type of cross‑sections. You can adjust all the values of a 'FEMA' hinge using your own user‑defined values. Figure 1 shows the Plastic Hinge dialog box.

        Plastic hinges in accordance to EN 1998‑3: This is a nonlinear hinge with a bilinear definition. The bilinear hinges include predefined values for the yielding points in the hinge diagram, acceptance criteria, and yielding limits of the cross‑sections. These values can also be adjusted manually.

        The plastic hinges are displayed with various colors when viewing the results of several load steps. The colors depend on the state of plasticity. This is very useful to identify exceeded acceptance criteria.

      2. Instead of using hinges, you can use the 'Plastic Hinge' type of member nonlinearity in RFEM. In the relevant dialog box, you can define perfectly plastic behavior and set the yielding limits manually. The main advantage of this option is that the location of the plastic hinge is found automatically during the iterative calculation. See Figure 2 for further explanation.

    2. Definition of load pattern for nonlinear analysis

      You can manually define loads in a specific load case, for example a uniform load pattern.

      To achieve load distribution in accordance to a mode shape of your structure you can use RF‑DYNAM Pro - Equivalent Loads. This add‑on module calculates eigenvalues, mode shapes and equivalent loads by using the multi‑modal response spectrum analysis. For each selected eigenvalue, the program automatically exports the equivalent loads into a load case in RFEM.


    3. Load increments in RFEM

      In the calculation parameters of load cases, you can define an incrementally increasing load. The results of each load step can then be analyzed. When using 'Plastic Hinges', you can easily evaluate the plasticity states due to the color marking of the hinges. It is important to scale the exported equivalent loads from RF‑DYNAM Pro to avoid load increments in too large steps. 

      Figure 3 shows a load case exported from RF‑DYNAM Pro and the recommended calculation parameters.


    4. Calculation diagrams for creating pushover curve

      These diagrams are available in the 'Global Calculation Parameters' dialog box. Here you can set the sum of support forces on the vertical axis and the deformation in a roof plane on the horizontal axis and thus obtain the required pushover curve. The data can easily be exported to Excel. The pushover curve is displayed in Figure 4.

      Figure 5 shows the color representation of the plastic hinges. The color scale can display the hinge diagram parameters or the acceptance criteria.

      The continuing pushover analysis (determination of the inelastic spectrum and performance point) can further be carried out in an external program (for example Excel).


  • 回答

    The administration interface can be accessed via http://localhost:1947. No further installation i srequired because this service is available after the installation of the dongle driver.

    All Sentinel dongles are displayed in the option Sentinel Keys. By clicking on one of these dongles you get to the address of the server.

    Our licenses are displayed with the vendor number 48521. If you select the option Sessions here, you can see who is using which license.
  • 回答

    The interface "Autodesk AutoCAD Structural Detailing" allows you to export the results of the RF‑CONCRETE Surfaces add-on module including the geometry directly to AutoCAD Structural Detailing. Since no RF‑CONCRETE Surfaces case has been created in your model, an error message appeared saying that no load case was found.

  • 回答

    The internal forces to be considered in design can be found in the "1.6 Reinforcement" window, "Reinforcement Layout" tab. Here you can select the internal forces, which should not be taken into account for the respective reinforcement group. Please note that this setting is valid for all members of the reinforcement group. You should use this function carefully.

  • 回答

    The beam is a rolled section with welded taper from sheets or an I-section. In order to use such a cross-section in RF-/FRAME-JOINT Pro, the web thickness of the welded component has to have at least the same value as the main cross-section web.

  • 回答

    Please note, that the object snap must be activated when inserting new linear dimensioning. Furthermore, you can activate the corresponding objects for snapping in the "Work Plane and Grid/Snap" dialog box, "Object Snap" tab.
  • 回答

    Open the program and click "Options" -> "Program Options" in the menu. You can change the language in the "Program" tab. Close the program and open it again to activate the selected language.

  • 回答

    For relatively common structures, you can select various generators by clicking menu: "Tools" -> "Generate Model - Members (Surfaces)". If you cannot find the required template there, you can look in the block manager. It can be opened by clicking menu: "File" -> "Block Manager" and has a similar structure as the project manager. The corresponding catalogue includes numerous parametrized structures, for example for silos or towers. It is also possible to parametrize already modeled structures and save them as a block.

  • 回答

    Your student license is connected to your computer. After the first activation on your computer, a "fingerprint" with information about your hardware components is sent to us. If you try to activate the same license on another computer, this error message appears. Changing specific hardware or formatting/partitioning your driver may also cause the loss of your license. In such a case, you have to previously transfer the license to another computer or back again. For the description of how it works, see this PDF document on page 2.


    2127-softwarelizenz.pdf (838 kB)
    software-licence.pdf (835 kB)

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