#### 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.

• ### Where can I get the hash code based on my e-mail address for using the web service function behind the geo-zone tool "Snow, Wind and Seismic Zones"?

New FAQ 004269 EN

In addition to the blocks for describing the load type, location and language, the request URL also includes blocks for describing the user's identity. The "login" module describes the user's e-mail address and the "hash" module describes a hidden password. For a functional login, the e-mail address must be stored in a valid Dlubal account.

If you do not have a Dlubal account yet, you can create an account on this page:

https://www.dlubal.com/en-US/extranet/create-new-account

With successful login to your Dlubal Account at the top left corner of our website

Figure 02 - Login to Dlubal Account
https://www.dlubal.com/en-us

the "My Account" page opens. Under the heading "User Data", you can find the identity components "login" and "hash" at the bottom for using the Geo-Zone Tool web service function.

Figure 03 - Web Service Identity in Dlubal Account

• ### What is the procedure for performing an earthquake analysis in RFEM/RSTAB?

New FAQ 004258 EN

For an earthquake analysis, the RF-/DYNAM Pro - Natural Vibrations and RF-/DYNAM Pro - Equivalent Loads add-on modules are available. Thus, it is possible to perform the multimodal response spectrum analysis. After the analysis in the add-on modules, the calculated seismic loads are exported to load cases, which can be evaluated as usual.

In addition, you can evaluate the projectile displacement and the horizontal shear of the building. These and other features are described in detail in the webinar "Seismic Analysis in RFEM ".
• ### I have used the RF-/DYNAM Pro add-on module to generate the governing result combinations of seismic loads. What is the next way to perform a design of the individual components?

FAQ 003598 EN

With the Equivalent Loads and Forced Vibrations add-on modules, you can create result combinations that contain the governing combinations of seismic loads. To perform a design with them, they have to be combined further on the basis of the extraordinary combination. This combination is defined, for example, in EN 1990 Art. 6.4.3.4:

${\mathrm E}_{\mathrm d}\;=\;\underset{}{\sum_{}^{}\;{\mathrm G}_{\mathrm k,\mathrm j}\;+\;\mathrm P\;+\;{\mathrm A}_{\mathrm{Ed}}\;+\;}\overset{}{\underset{}{\sum{\mathrm\psi}_{2,\mathrm i}\;{\mathrm Q}_{\mathrm k,\mathrm i}}}$

This accidental combination has to be defined manually in RFEM. Make sure that (for a direction combination with the 100/30% rule), both created result combinations from RF-/DYNAM Pro have to be added with the "Or" condition. A combination like this is displayed in Figure 02.

This accidental combination can then be used for further design. It is possible to evaluate the governing internal forces as well as to import and calculate this combination in the design modules.
• ### What type of procedure is carried out by the RF-/DYNAM Pro add-on module - Equivalent Loads?

FAQ 003510 EN

Like the 'Forced Vibrations' module, the 'Equivalent Loads' add-on module performs the multimodal response spectrum analysis.

Contrary to what the name suggests, the simplified response spectrum method is not carried out here, as it is explained, for example, in EN 1998-1.

The equivalent loads are determined separately for each direction of excitation according to the following formula:

$\begin{Bmatrix}{\mathrm F}_{\mathrm X}\\{\mathrm F}_{\mathrm Y}\\{\mathrm F}_{\mathrm Z}\end{Bmatrix}\;=\;\mathrm\Gamma\;\ast\;\begin{Bmatrix}{\mathrm u}_{\mathrm X}\\{\mathrm u}_{\mathrm Y}\\{\mathrm u}_{\mathrm Z}\end{Bmatrix}\;\ast\;{\mathrm S}_{\mathrm a}(\mathrm T)\;\ast\;\begin{Bmatrix}{\mathrm M}_{\mathrm X}\\{\mathrm M}_{\mathrm Y}\\{\mathrm M}_{\mathrm Z}\end{Bmatrix}\;$

The differences between the two add-on modules are described in this FAQ .

• ### Why does the online service 'Snow, Wind, and Seismic Zone Maps' display a different load value than the corresponding standard in some cases?

FAQ 003408 EN

The online service 'Snow, Wind, and Seismic Zone Maps' can only save a constant value over a surface area.

If the respective load standard specifies an isolines representation of the load over the land instead of a conventional zone classification, the interactive load map shows the areas between the isolines as zones with a constant value. In each case, these zones are assigned the larger value of the two enclosing isolines.

• ### I have generated the earthquake loads manually. How can I combine them according to the superposition rules of the standard?

FAQ 003346 EN

If you have defined load cases with earthquake loads and can not combine them with the RF-/DYNAM Pro add-on module, you should not apply the automatic combinatorics for this. The following steps describe how to define the manual combinatorics:

• Depending on whether you want to use the SRSS or CQC rule, you may have to activate it in the general data (only necessary in the case of the CQC rule). For the CQC rule, you have to activate additional parameters; this can be set in the load cases.

• Create one result combination per direction. Add all load cases where you have defined earthquake actions in this direction. The type of superposition can then be defined in the calculation parameters.
• Next, the directions are superimposed in further result combinations. For this purpose, the Eurocode 8, for example, specifies the 100/30% rule. To do this, add "and"  to the result combinations of the individual directions and change the factors to 1.0 for the dominant direction and 0.3 for the other directions. It is necessary to create always one result combination for each direction.

• Finally, another result combination is created, which can then be used for the design. In this table, the earthquake loads are superimposed with the permanent and the imposed loads (creation of the unusual combination). Please note that the result combinations for earthquakes must be added with "or".

• ### How are the site-specific Geo-Zone Tool data queries calculated to determine the various building loads?

FAQ 003319 EN

The online service " Snow, Wind and Seismic Zone Maps" shows the snow load, wind and seismic zones according to the relevant standards on the Google Map in many countries and shows the site-specific loads of the corresponding displayed zone map for the selected location on the map.

The location on the map can be defined either by using the search function offered on the website or by clicking the desired location on the map.

The connected load determination is linked to the selected location and always shows the site-specific load depending on the local load zone information and the height above sea level.

Since our online service uses the fee-based Google Maps services as a basis, we offer our users only a limited number of free geo-data queries (load determinations). In the event that this limited number of load determinations is not sufficient, our Geo-Zone Tool Data Queries packages are available. These packages release a certain number of site-specific data queries for all stored contacts of a company.

A data query corresponds to a load determination depending on the selected zone map (load type) and location on the map. A possible change of the load type leads to another data query due to new zone information. Thus, in the standard case, each location requires at least 3 queries with regard to the determination of the local snow, wind and seismic load.

• ### Is it also possible to integrate the online service 'Snow, Wind, and Seismic Zone Maps' into external applications?

FAQ 003268 EN

Yes, it is possible to integrate the complete frame 'Snow, Wind and Seismic Zone Maps' including the search function, location description and load output by means of the URL in other applications.

After entering the "Full Screen" mode, you receive the required URL in the browser address bar.

For determining the location-specific building loads, there is – additionally to this - an online web service in the background. If providing the necessary data (location, load type, load standard, etc.), this web service allows the data to be called up digitally for transfer to an external application.

→ see FAQ

• ### How do I determine the stiffness center of my structural system?

FAQ 003230 EN

The RFEM program allows you to determine the center of gravity of a structural system. This is explained in this FAQ .

However, the center of gravity does not have to be necessarily confused with the stiffness center. This can be determined according to the theory of stiffening systems by using the SHAPE‑THIN program. The following webinar will also explain the practical application of the stiffness center in seismic design.

To determine the center, there is the third and final option that allows you to consider the stiffness with a stiffness model in RFEM. This will be explained soon in the technical articles of this series.
• ### How can I determine loads at particular geographic coordinates in the online service "Geo-Zone Tool: Snow, Wind, and Seismic Zone Maps"?

FAQ 003210 EN

As the text box used to search for the location in the online service "Geo-Zone Tool: Snow, Wind, and Seismic Zone Maps" does not search the location database of the map, but completes the entry automatically with each new character, the numerical specification of geographic coordinates in this area is not successful.

However, one of the modifications of the URL address in full-screen mode allows you to move the pointer for the load determination to the desired geographic position.

To do this, enter the geographic coordinates in the format [Latitude, Longitude] separated by a point in the last URL module after the "=" character.

1 - 10 of 17

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.”