#### Further Information

In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.

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• ### How can I transfer a field of nodes instead of just a single node via the COM interface in VBA?

To transfer several elements, you have to create a field (array) in VBA first:

Dim nodes(0 to 2) as RFEM5.Node

Then, you can use the method IModelData.SetNodes() to transfer all nodes to the field (here, three elements 0,1,2) at once.

These methods are also available for the following structural elements, for example:

IModelData.SetLines()IModelData.SetMembers()IModelData.SetSurfaces()
• ### In RF‑CONCRETE Members, I receive the error message: "Set of members No. will be removed from the calculation." What does it mean?

The sets of members to be designed in the add-on module must be based on the same or the consistently running cross-section.

An exception is a set of members consisting of ribs. This only results in an identical cross-section if the integration width of the rib is selected to be the same. Thus, there must be a single rib type for the entire set of members.

Tapered sets of members are only designed if the entire set of members has a linear cross-section diagram.

• ### Why can not I select stick sets for the proof of usability in the respective rated modules? Under "usability parameters, I can not specify stick sets.

In the basic information, the rod sets must first be selected so that they can be dimensioned for the corresponding limit states. Thereafter, various requirements for the proof of serviceability can be made in the usability parameters.
• ### I design a set of members with a uniform, double-symmetric cross-section and get the message: 'Non-designable: ER051) Moment about z‑axis on asymmetric cross-section, taper or set of members'. Why?

The reason for this warning is that sets of members cannot be designed according to General Method 6.3.4 of EN 1993-1-1 by default. However, this method is only allowed loading in the support direction, that is, without the transverse bending moment. Therefore, the corresponding warning appears.

You can perform the stability analysis as cross-section design according to the second-order theory, which is possible by using the add-on modules RF-/FE-LTB or RF-/STEEL Warping Torsion.

As an alternative, you can neglect the transverse bending in the filter options of the 'Details' dialog box, the 'Stability' tab, or activate the adapted method according to Naumes in the 'National Annex' dialog box, which enables transverse bending. The use of these two options is at the discretion of the user.

In this case, however, the best option is to select Equivalent Member Method for the design of sets of members in the 'Details' dialog, the 'Stability' tab.

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 hints and tips to help you get started with the main programs RFEM and RSTAB.

#### Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated 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

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I would like to pay a compliment to your support team. I am always impressed how quickly and professionally the questions are answered. I have used a lot of software with a support contract in the field of structural analysis, but your support is by far the best. ”