#### 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.

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

• ### Are the models and presentations from Info Day 2015 freely available, and can you send them to me?

New FAQ 004284 EN-US

Yes, the data is freely available. Use the following download option to load the presentations and finished models of the consultants.
• ### How to deactivate an authorized RWIND simulation license based on a software key on a single-user computer offline via email?

New FAQ 004283 EN-US

The RWIND Simulation program is protected against unauthorized use. The application works without restrictions on the single-user computer on which the software key-based license is activated. To release the assigned license (e.g. for use on a different single-user computer), the license can be deactivated again offline via email on the license-holding single-user computer. To do this, proceed as follows:

1. Run the RWIND Simulation 'As Administrator'. To do this, right-click the RWIND Simulation icon and select 'Run as Administrator'.

Figure 01 - Program Start

2. Select the 'RWIND Simulation - License and Authorization' function in the 'Help' menu.

Figure 02 - License and Authorization Settings

This opens the 'RWIND Simulation 1.xx Authorization Status' dialog box.

3. Check in the 'RWIND Simulation 1.xx Authorization Status' dialog box whether an active software key authorization is available. This is the case if the 'Software Key' option is selected in the 'Authorization Method' section and an active authorization is indicated by a green dot in the 'Authorization Status' section.

Figure 03 - Authorization Status

If the check is negative, and a red dot is displayed, no RWIND Simulation license based on a software key is activated on the single-user computer. Consequently, no license can be deactivated.

If the above requirements are met, click the 'Deactivation via E-Mail' button. The 'Deactivation of RWIND Simulation' dialog box appears.

4. The 'Deactivation of RWIND Simulation' dialog box explains the deactivation process.

Select the 'Deactivate RWIND Simulation Now' function.

Figure 04 - Email Deactivation

This opens the 'RWIND Simulation 1.xx' dialog box.

5. In the 'RWIND Simulation 1.xx' dialog box, select 'Yes' for the license deactivation.

Figure 05 - Confirmation Prompt

After successful deactivation, you will receive a confirmation message. You can use the program only in demo mode now.

The dialog box 'Deactivation of RWIND Simulation' opens again.

6. Deactivation code is now displayed in the ‘Deactivation of RWIND Simulation’ dialog box. Copy this text block to the Windows clipboard with the 'Copy to Clipboard' function and then paste the code into a blank e-mail with [Ctrl]+[V] or the Windows paste function. Send this email to support@dlubal.com to complete the license deactivation.

Figure 06 - Sending Deactivation Code

With this code, we document a proper deactivation in our system.
You can now reactivate the released license on another single-user computer.

• ### I have designed a reinforced concrete column as a solid and would like to perform a punching shear design for the connection of the column to the ceiling. Is it possible with RF-PUNCH Pro?

New FAQ 004282 EN-US

For the punching shear design on a column, RF-PUNCH Pro requires a node at which the axial force of the column can be tapped for the design.

If you have displayed the column as a solid (for example, with a rectangular cross-section) and directly connect this solid to the floor, you cannot use this situation for the design in RF-PUNCH Pro. The member internal force is missing because only one solid is used.

However, you can provide the end of the solid with a short coupling member (for example, a rigid member). Then, the rigid member can be connected to the floor at an end node, and the axial force in the coupling member can be used for the punching shear design.

Please note that the dimensions of the coupling member or rigid member need not be defined in the RFEM model. Therefore, the RF-PUNCH Pro applies standard dimensions for the column cross-section.
• ### Does the program RF-LAMINATE consider the shear correction factor for cross-laminated timber slabs?

New FAQ 004281 EN-US

The shear correction factor is taken into account in the RF-LAMINATE program using the following equation.

$k_{z}=\frac{{\displaystyle\sum_i}G_{xz,i}A_i}{\left(\int_{-h/2}^{h/2}E_x(z)z^2\operatorname dz\right)^2}\int_{-h/2}^{h/2}\frac{\left(\int_z^{h/2}E_x(z)zd\overline z\right)^2}{G_{xz}(z)}\operatorname dz$

with $\ int _ {- h/2} ^ {h/2} E_x (z) z ^ 2 \ operatorname dz = EI _ {, net}$

The calculation of the shear stiffness itself can be found on page 15 of the English version to the manual of RF-LAMINATE as follows:

For the 10 cm thick plate in Figure 1, the calculation of the shear correction factor is shown. The equations used here are only valid for the simplified symmetrical plate structures!

 Layer z_min z_max E_x (z) (N/mm²) G_xz (z) (N/mm²) 1 -50 -30 11000 690 2 -30 -10 300 50 3 -10 10 11000 690 4 10 30 300 50 5 30 50 11000 690

$\sum_iG_{xz,i}A_i=3\times0,02\times690+2\times0,02\times50=43,4N$

$EI_{,net}=\sum_{i=1}^nE_{i;x}\frac{\mbox{$z$}_{i,max}^3-\mbox{$z$}_{i,min}^3}3$

$=11000\left(\frac{-30^3}3+\frac{50^3}3\right)+300\left(\frac{-10^3}3+\frac{30^3}3\right)$

$+11000\left(\frac{10^3}3+\frac{10^3}3\right)+300\left(\frac{30^3}3-\frac{10^3}3\right)+11000\left(\frac{50^3}3-\frac{30^3}3\right)$

$=731,2\times10^6Nmm$

$\int_{-h/2}^{h/2}\frac{\left(\int_z^{h/2}E_x(z)zd\overline z\right)^2}{G_{xz}(z)}\operatorname dz=\sum_{i=1}^n\frac1{G_{i;xz}}\left(χ_i^2(z_{i;max}-z_{i,min})\;χ_iE_{i,x}\frac{z_{i,max}^3-z_{i,min}^3}3+E_{i,x}^2\frac{z_{i,max}^5-z_{i,min}^5}{20}\right)$

$χ_i=E_{i;x}\frac{z_{i;max}^2}2+\sum_{k=i+1}^nE_{k;x}\frac{z_{k,max}^2-z_{k,min}^2}2$

 χ1 13.75 106 χ2 8.935 106 χ3 9.47 106 χ4 8.935 106 χ5 13.75 106

$\sum_{i=1}^n\frac1{G_{i;yz}}\left(χ_i^2(z_{i,max}-z_{i,min})-χ_iE_{i,y}\frac{z_{i,max}^3-z_{i,min}^3}3+{E^2}_{i,y}\frac{z_{i,max}^5-z_{i,min}^5}{20}\right)=$

 8.4642 1011 3.147 1013 2.5 1012 3.147 1013 8.4642 1011

Total 6.7133 x 1013

$k_z=\frac{43,4}{{(731,2e^6)}^2}6,713284\;e^{13}=5,449\;e^{-3}$

$D_{44}=\frac{{\displaystyle\sum_i}G_{xz,i}A_i}{k_z}=\frac{43,4}{5,449\;e^{-3}}=7964,7N/mm$

This corresponds to the value output in RF-LAMINATE (Figure 2).
• ### How can I online deactivate an authorized RWIND Simulation license based on a software key on a single-user computer?

New FAQ 004280 EN-US

The RWIND Simulation program is protected against unauthorized use. The application works without restrictions on the single-user computer on which the software key-based license is activated. To release the assigned license (e.g. for use on another single-user computer), the license can be deactivated online again on the license-holding single-user computer. To do this, proceed as follows:

1. Run the RWIND Simulation 'As Administrator'. To do this, right-click the RWIND Simulation icon and select 'Run as Administrator'.

Figure 01 - Program Start

2. Select the 'RWIND Simulation - License and Authorization' function in the 'Help' menu

Figure 02 - License and Authorization Settings

This opens the 'RWIND Simulation 1.xx Authorization Status' dialog box.

3. Check in the 'RWIND Simulation 1.xx Authorization Status' dialog box whether an active software key authorization is available. This is the case if the 'Software Key' option is selected in the 'Authorization Method' section, and an active authorization is indicated by a green dot in the 'Authorization Status' section.

Figure 03 - Authorization Status

If the check turns out to be negative and a red dot is displayed, no RWIND Simulation license based on a software key is activated on the single-user computer. Consequently, no license can also be deactivated.

If the above requirements are met, click the 'Deactivate Online' button. The 'Online Deactivation' dialog box appears.

4. The 'Online Deactivation' dialog box shows the license specification to be deactivated.

Select the 'Deactivate Now' function.

Figure 04 - Online Deactivation

This opens the 'RWIND Simulation 1.xx' dialog box.

5. In the 'RWIND Simulation 1.xx' dialog box, select 'Yes' for the license deactivation confirmation dialog box to permanently deactivate the license.

Figure 05 - Confirmation Prompt

After successful deactivation, you will receive a confirmation message. You can use the program only in demo mode now.
You can now reactivate the released license on another single-user computer.

• ### Is it possible to consider the static rest position in a time history analysis?

New FAQ 004279 EN-US

Yes, you can consider the static rest position in a time history analysis. For this you can use the 'Stationary State' function (not available in the linear modal analysis).

With this function, it is possible to read a condition from a load case or a load combination that exists over the entire time history. These include the deformations, the stiffness modifications, and the states of nonlinearities.

This function is activated in the RF-/DYNAM Pro add-on module, in the 'Calculation Parameters' tab of the Dynamic Load Cases.

The time history diagram is well suited for results evaluation. In the attached example, load case 1 with the dead load was defined as a stationary state. In the time diagram, it can be seen that the deformations oscillate about the value that is reached by the static rest position.

• ### How to authorize the RWIND Simulation program offline with a software key on a single-station computer via e-mail?

New FAQ 004278 EN-US

The RWIND Simulation program is protected against unauthorized use. The program can be authorized offline (computer is not connected to the Internet) by activating an email. To do this, proceed as follows:

1. Run the RWIND Simulation 'As Administrator'. To do this, right-click the RWIND Simulation icon and select 'Run as Administrator'.

Figure 01 - Program Start

2. Confirm the authorization check with the 'Activate Now' function.

Figure 02 - Authorization Check

This opens the 'RWIND Simulation 1.xx Demo Authorization Status' dialog box.

3. In the 'RWIND Simulation 1.xx Demo Authorization Status' dialog box, select the 'Software Key' option in the Authorization Method area and click the 'Activation via E-Mail' function in the lower part.

Figure 03 - Email Activation

This opens the 'Activation by E-Mail' dialog box.

Further, enter a user-defined description of the workstation to be activated under 'Description of Workspace' and the RWIND Simulation level with an expiry date of the activation to be carried out under 'Required Authorization'.

Then confirm your entries by clicking the 'Generate Request Code' function.

Figure 04 - Generating Request Codes

This opens the 'RWIND Simulation 1.xx Demo' dialog box.

5. Check the entries made in the 'RWIND Simulation 1.xx Demo' dialog box. If they comply, confirm the dialog box with 'OK'.

Figure 05 - Checking Entries

This opens the 'Activation by E-Mail' dialog box.

6. The 'Activation via E-Mail' dialog box consists of three parts. In the 'Step 2' tab, the required request code is displayed on the left. Copy this text block to the Windows clipboard with the 'Copy Request Code' function and then paste the code into a blank e-mail with [Ctrl]+[V] or the Windows paste function. Send this email to support@dlubal.com for further processing.

Figure 06 - Sending Request Code

7. You will receive an activation code from us. In the dialog box, go to the 'Step 3' tab and enter this code in the 'Activation Code' field.

Then, start the activation process by clicking the 'Activate Now' function.

Figure 07 - Program Activation

After successful authorization, you will receive a confirmation message and it is possible to use the program without any restrictions.
This offline email activation occupies the license you have purchased for the defined activation period in our system. During this period, it is not possible to activate the RWIND Simulation program with the same license on any other computer. The assignment of the license in our system ends with a proper deactivation or after the defined activation period has expired.

Afterward, the activation process can be carried out again on the same or a different computer. Please note that e-mail request codes can only be used once for activation. To reactivate, a new request code must always be sent to us.

To avoid unnecessary license assignments in our system due to unexpected computer problems on your part (defect, loss, hardware replacement, change of employees, etc.), we recommend that you keep the activation period as short as possible.

• ### Why do the equivalent stresses of RFEM and RF-STEEL differ from each other, although the same CO is considered?

New FAQ 004277 EN-US

It is possible to display or calculate the stresses in RFEM as well as in the add-on module by means of the following smoothing options:

• Constant on elements
• Not continuous
• Continuous within surfaces
• Continuous total
• Continuously by groups or Continuous by groups

To compare the results, the same display type and calculation type must be selected in RFEM and RF-STEEL Surfaces.

In RFEM, it is possible to do this in the Project Navigator Show → Results → Surfaces → Distribution of Internal Forces/Stresses (Figure 02). In RF-STEEL Surfaces, this can be displayed or changed in the Details → 'Options' tab (Figure 03).

• ### I have a structure with many members. How can I quickly find a member by member number?

New FAQ 004276 EN-US

The easiest way to find a member is to select Project Navigator - Data. Here, right-click the members and select "Find Members." Now you can enter the member number and the member is marked with an arrow in the graphic.
• ### Despite having defined average regions, they are not taken into account for the design in RF-LAMINATE Surfaces. Which setting did I miss here?

New FAQ 004275 EN-US

To consider average regions when designing in RF-LAMINATE, they must always be activated in the detail settings of the add-on module. See Figure 01 with the detailed settings in RF-LAMINATE for this.

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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

“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.”