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  • 回答

    The RF-DYNAM Pro - Nonlinear Time History offers, in addition to the implicit NEWMARK method of mean acceleration, also an explicit method. In the manual of this add-on module, it is mentioned that this is a solver which uses the central difference method.

    It should be noted that not the "original" version of the central difference method is used here, but a modified form. The modified form is characterized by the fact that it is simply not a central difference when applying the speed difference. The following two equations show the applied speed and acceleration differences.

    Speed: (no central difference)
    ${\dot{\mathrm x}}_{\mathrm n+\frac12}=\frac{{\mathrm x}_{\mathrm n+1}-{\mathrm x}_\mathrm n}{{\mathrm{Δt}}_{\mathrm n+{\displaystyle\frac12}}}$

    Acceleration: (central difference)
    ${\ddot{\mathrm x}}_\mathrm n=\frac{{\dot{\mathrm x}}_{\mathrm n+{\displaystyle\frac12}}-{\dot{\mathrm x}}_{\mathrm n-\frac12}}{{\mathrm{Δt}}_\mathrm n}$

    This approach leads to a faster convergence since it responds "faster" to changes in loading or structure (nonlinearities).
  • 回答

    If you perform a punching shear design for a wall corner or a wall end at a floor slab or foundation plate, this entry is not necessary.

    Since the punching load is determined at a wall corner or a wall end from the shear forces in the control perimeter when performing the punching shear design, the ratio of the surface load is missing anyway within the control perimeter (up to the load application). Therefore, this entry is also not necessary in the 1.5 dialog box.

    If you, however, perform the punching shear design for a single column at a foundation plate with the punching load from the normal force of this column, you can enter the "Deductible Surface Load" at the end of the dialog box "1.5 Nodes of Punching Shear - Node of Punching Shear - Details" which allows to determine ΔVEd.
  • 回答

    Yes, you can use "orthotropic surfaces" for the reinforced concrete design in RF-CONCRETE Surfaces.

    If you only would like to carry out serviceability limit state designs, you do not have to define additional settings in RF-CONCRETE Surfaces concerning the surface type.

    You need the RF-CONCRETE NL add-on module to perform the serviceability limit state designs. Select in the "serviceability limit state" tab (in the dialog box "1.1 General Data") the design method "Nonlinear...". See Figure 01.

    You can then change the surface type to "Constant" in the dialog box "1.3 Surfaces" so that the serviceability limit state design is also possible here. See Figure 02.
  • 回答

    It is possible to simulate one-way continuous slabs (e.g. precast slabs) by using the "orthotropy" of the surfaces.

    You can set the stiffness type "Orthotropic" in the "Edit Surface" dialog box separately for each surface. See Figure 01.

    In the "Edit Surface Stiffness - Orthotropic" dialog box, you can define the orthotropy type and select, for example "Effective thicknesses". See Figure 02.

    You can then define the effective thickness in the local x and local y-direction of the corresponding surface in the "Effective thickness" tab. Moreover, you also have the possibility in this dialog box to define an effective thickness for the self-weight. See Figure 03.
  • 回答

    With the FEA Software RFEM, it is possible to perform the structural analysis and design of containers (shipping containers, office containers, mobile homes, etc.). 

    RFEM offers member, surface and solid elements for detailed modeling. All components can be designed in the corresponding add-on modules.

  • 回答

    The prerequisite for using both generators for wind and snow load are that you are working with the 3D model type because when working with a 2D model type, the program does not have the corresponding geomtrical parameters.
    The model type has to be set in the "Edit Model - General Data" dialog box. The dialog is opened by right-clicking "Model Data", "General Data" in the Project Navigator - Data. The modeling may have to be adapted.
  • 回答

    If the "Authorization" dialog box (see Figure 1) is not displayed when starting the program, an authorization file has been already imported. In this case, please select in the Help → Authorization menu Diagnosis (see Figure 2). Save the text file and open it. Open the path in the Windows Explorer which is shown at "PermDataDirectory" (see Figure 3). In this directory, you find the file AUTHOR.INI which needs to be deleted. When starting rhe program the next time, the authorization dialog box, as shown in Figure 1, will be displayed. To activate the license, select the "Use full version" option (internet connection required).

  • How can installations be distributed via the network?

    FAQ 002317 EN 安装 RFEM RSTAB SHAPE-THIN CRANEWAY RX‑TIMBER Glued‑Laminated Beam

    回答

    The installation packages can be distributed with a MSI file (Windows Installer Package). It is necessary to extract the MSI file from the installation package.

    You have to start setup.exe with the parameter "-E" (see Figure 1). For the example shown in the figure, the RFEM installation file has been copied to drive C:\. After the decompression, you find a new folder in the same path with the name "Dlubal_Program_Version Number_Architecture". For the example in Figure 1, a folder with the name Dlubal_RFEM_5.07.13.124218_64-bit has been created.

    The installation can be started afterwards from this folder with the command "msiexec -i .msi" (see Figure 2). If the authorization file should be imported at the same time and if the language should be German, the command is as follows:

    msiexec -i "Dlubal RSTAB 64-bit.msi" -passive -q TRANSFORMS=1031.mst AUTHORIZATION_FILE_PATH=\\[IHR SERVER]\AUTHOR.INI

    If the command -q (=-quiet) is used, the installation is carried out without graphical user interface.

    It should be ensured that the command prompt is started by right-clicking → Run as Administrator.

    If the program language should be English, the parameter "TRANSFORMS=1031.mst" has to be deleted.

    You can find detailed information about all commands and language IDs in the document DlubalSoftwareDeployment.pdf (see below).
  • 回答

    The calculation does use all kernels. Some processors (Intel Core i7, XEON...), however, support Hyper-Threading. This means that each physically available procesor core is split up into two virtual cores for applications. This aims at a better usage of the single units of the core. There are some applications which benefit from this and run faster. However, this is not the case for the computation kernel of RFEM. Therefore, the computation kernel of RFEM often only uses the physically available cores, and the Task Manager displays that the processor seems to only have a usage of 50%.

  • Which resources are available to perform the pushover analysis?

    FAQ 002258 ZH 附加模块 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).


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