Search FAQ

Further Information

In addition to personal support, we offer resources 24/7 through our website.

Receive information including news, useful tips, scheduled events, special offers, and vouchers on a regular basis.

1 - 10 of 39

Sort by:

Items:

• ### I have just noticed that the STEEL EC3 add-on module also calculates with γM0 = 1.0 when designing a tension member, although it should actually be γM2 = 1.25. How can I perform the design correctly?

In order for the program to calculate the failure due to tension, the "Net Cross-Sectional Area" function must be activated in the "Parameters - Members" window.

• ### What should be considered when using a failure of columns under tension in the RF‑/DYNAM Pro – Equivalent Loads add-on module?

In order to consider the failure of certain members when using RF‑/DYNAM Pro – Equivalent Loads, proceed as follows:

1) Deactivating the corresponding members for the eigenvalue determination within the corresponding load case, see Image 01 (add-on module, tab Natural Vibration Cases, Calculation Parameters) and Image 02 (main program, Calculation Parameters, Deactivate and select).

2) Determining dynamic load cases from RF‑/DYNAM Pro by using the calculation, then deactivating the corresponding member in the main program within the global calculation parameters of the dynamic load cases, see Image 03.

• ### A rigid member should only be able to absorb tensile forces or only compressive forces. What are the options for considering these nonlinearities in the calculation?

There are two options for defining the failure:

1. Assignment of member nonlinearity
For the member types "Beam" and "Rigid", you can define a member nonlinearity for each member. You can find the corresponding option in the "Settings" tab (see Figure 01).

2. Assignment of nonlinear member hinges
Alternatively, you can define a member end hinge with failure criterion for the member. For the desired degree of freedom, you can assign the hinge condition with nonlinearity accordingly (see Figure 02).
• ### How can I enter a member elastic foundation that only acts in one direction?

Define the ineffective foundation in the "New Member Elastic Foundation" dialog box, see the figure.

• ### Does the nonlinearity that can be activated for a surface support in the z‑direction refer to the entire supported surface, or only to the areas that correspond to the nonlinearity?

004772

The nonlinearity of surface supports, that is, "Failure if positive/negative contact stress in z," see Figure 01, only refers to the relevant area.

In the remaining area, the surface support acts accordingly, see Figure 02.

• ### When using line releases, I cannot understand the failure definition. Which axis do the nonlinearities "Fixed if positive vz" and "Fixed if negative vz" refer to?

The positive and the negative direction refers to the axis system of the line release. The forces, such as vz, are related to the object on the original line.

In the following, the definition will be briefly explained by using the example of a release between a wall and a ceiling. If the wall is the released object, the definition of a failure for the lifting load would be as follows:

• Between the floor slab and the wall, the "Fixed if negative vz" nonlinearity should be selected.
• Between the wall and the ceiling above, the "Fixed if positive vz" nonlinearity should be selected.

If the failure is defined incorrectly, you can check it using the determined deformation diagram.

• ### I cannot open the dialog box for entering the soil profile in FOUNDATION Pro anymore. Why?

The dialog box for defining the soil profile is deactivated when deactivating the dependent designs in the detail settings.

It is not required to enter a soil profile for the following design types:

• Ground failure resistance according to EN 1997-1, Annex D
• Sliding design
• Settlement calculation

As soon as you activate one of the options mentioned above, the dialog box for entering the soil profile will also be available again.

• ### How can I deactivate the individual members for the calculation, for example, to simulate a column failure?

There are two ways to do this:

1. You can define the corresponding member as a null member. Thus, it is not considered in the calculation of all load cases and load combinations.
2. You can deactivate the corresponding member in all or only for certain load cases and/or load combinations. To do this, it is necessary to activate the "Modify stiffnesses" option in the calculation parameters of the load case or load combination. Then, you can deactivate this member in the additional tab window.

However, you should pay attention to the following points:

• When using the null member, a warning message appears if the member loads have been defined.
• In the case of generated loads, the loads are redistributed automatically when using the null member.
• If deactivating the member in the calculation parameters, the member loads and the determined generated loads are not considered. No error message appears in this case. It is necessary to redistribute the loads manually.
• ### I have defined a nonlinear line support with failure. Implausible results are displayed during the result evaluation. What can I do?

Similarly to surfaces, there are various smoothing options for displaying the results of support reactions. For a nonlinear support, you should always select the actual distribution to display the results.
• ### How can I set as quickly as possible that the load combinations generated by the program will be calculated according to the geometrically linear analysis, for example?

004331

In the "Edit Load Cases and Combinations" dialog box, you can specify in the bottom right of the "Combination Expressions" tab which method of analysis should be used as the basis for the generated load combinations. By default, the linear calculation according to the geometrically linear analysis is preset for load cases and the nonlinear calculation according to the second-order analysis for load combinations.

Thus, you can quickly determine whether the load case or the load combination is calculated according to the geometrically linear, second-order, or large deformation analysis. The postcritical analysis option allows you to carry out the stability analysis according to the large deformation analysis with regard to the post-critical failure of the entire structure.

In case the model includes cable members, the calculation according to the large deformation analysis is preset in all cases.

1 - 10 of 39

If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

First steps

We provide information and tips to help you get started with the basic program RFEM and RSTAB.

Wind Simulation & Wind Load Generation

With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

Your support is by far the best

“Thank you very much for the useful information.

I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. In the industry of structural analysis, I use several software including service contract, but your support is by far the best.”