#### 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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• ### I can no longer select, copy, move, or delete my guidelines. Could you please help me?

New FAQ 004214 EN-US

Please check if the function "Lock Guidelines" has been activated. You can find this function in the Project Navigator - Data under Guide Objects -> Guidelines. Please right-click a guideline and deactivate this function.
• ### How can I rotate a nodal support?

New FAQ 004213 EN-US

In the dialog box "Edit Nodal Supports", it is possible to rotate the support's local axis system (Figure 1). First, select the sequence that controls the sequence of the local support axes X ', Y', and Z ', and then specify the rotation angle about the global axes X, Y, and Z in the corresponding text boxes.

The support rotation can also be determined graphically by using the corresponding buttons in the dialog box. The rotation of the support is displayed dynamically in the dialog graphic.

After the calculation, the support reactions of a rotated nodal support can be evaluated in relation to the global axis system as well as to the local one (Figure 2).

• ### Various stiffness factors can be activated in the calculation parameters of a load case or load combination. What exactly is behind it?

New FAQ 004212 EN-US

The stiffness modifications can be controlled separately for the following elements:

• materials
• Cross-Sections
• Members
• Surfaces

#### materials

The first option "Materials" is only activated for load combinations by default (see Figure 02) because the second-order analysis is preset for this. When the function is activated, the stiffness of all elements is reduced by the partial safety factor of the material (see Figure 03). This is especially important in timber construction in Europe. If the automatic load combination was selected for the standard EN 1990 + EN 1995, SIA 260 + SIA 265 or DIN 1055-100 + DIN 18008, the result is different default settings. If the partial safety factor of the material is defined as 1.0, it does not matter if the function is activated or not.

#### Cross-Sections

Use this option to control the multiplication factors for individual cross-sections. In the "Modify" tab of the "Edit Cross-Section" dialog box, you can adjust the moments of inertia as well as surfaces of the cross-section. This affects the stiffness of the cross-sections.

#### Members

When editing a member, the "Modify Stiffness" dialog tab is available. There are different definition types (see Figure 05). The "Multiplier factors" option allows you to modify the stiffnesses of individual members in analogy to the cross-sections.

#### Surfaces

For surfaces of the "Standard" and "Without Tension" type, you can adjust the stiffness of the surface in the "Modify Stiffness" tab of the "Edit Surface" dialog box. There, you can modify the elements of the stiffness matrix with a factor (as with orthotropic surfaces).

#### Further possibilities of stiffness modification

In addition, you can select another option in the Calculation Parameters to specifically adjust stiffnesses for other elements (see Figure 07). When you select the "Modify stiffnesses" option, a new tab opens (see Figure 08). In addition to the member and surface stiffnesses, it is also possible to adjust the stiffnesses of supports and hinges individually.

#### Interaction of individual factors

If several factors have been defined for an element (for example, cross-section and member), they are multiplied by each other. The result for the example shown in Figure 09 is as follows:

#### Global control of stiffness modification

In the global calculation parameters (see Figure 10), you can deactivate all options mentioned above at once. The local settings in the calculation parameters of the load cases or of the load combinations are ignored.

• ### In RF-/JOINTS Steel - Rigid when connecting a beam to a column, is it possible to design the connection for the simultaneous effect of axial force and moment?

New FAQ 004211 EN-US

In RF-/JOINTS Steel - Rigid, the design according to EN 1993-1-8 Chapter 6.2.7 Equation 6.24 is implemented. If the acting axial force exceeds 5% of the plastic resistance N pl, Rd , Equation 6.24 is used.
• ### On which cross-sections can the member load "Pipe internal pressure" be applied?

New FAQ 004210 EN-US

The member load "Pipe internal pressure" can only be applied to the following cross-sections of the cross-section library (Figure 1):

• Rolled Circular Hollow Profiles
• Parametric - Thin-walled tubular sections

For all other cross-sections that are loaded with this member load, an error message is output before calculation (Figure 2).
• ### A PC is used by several users. Each user wants to use a different directory structure in Project Manager. How can this be done?

New FAQ 004209 EN-US

The directory structure in Project Manager is managed in the PRO.DLP file. This is located in the folder C:\ProgramData\Dlubal\Global\Project Manager by default. You can check the directory paths of the project manager in the "Program Options" dialog box (Project Manager menu "Edit → Program Options"), see Figure 1. This database file is available for all users. If you want each user to use a different project structure, you can create a PRO.DLP for each user (for example, PRO_User1.DLP, PRO_User2.DLP). The relevant database file must then be set by the relevant user in the program options after each user switch. This is also demonstrated in the video.

• ### One PC is used by several users. Are the user-defined materials available to all users of the PC?

New FAQ 004208 EN-US

The user-defined materials are available to all users. All users must have full access rights to the path of the user-defined material library.

User-defined materials are saved in the file Materials_User.dbd. For a standard installation, the file is located in the directory C:\ProgramData\Dlubal\[Program] [Version]\General Data. The file path can also be viewed in the program options (see Figure 1).

• ### I have a surface with complicated geometry and would like to know the surface area. Does RFEM display the surface area anywhere?

New FAQ 004207 EN-US

You can query the surface area using the shortcut menu.

Right-click on any surface of the entered structure. In the shortcut menu, you can find the entry 'Centroid and Info...'

In the dialog box that appears, it is possible to find the available information on this surface.

There you can find e.g. the surface area or the weight.
Optionally, a node can be created in the centroid of theselected surface. A multiple selection of surfaces is also possible.

• ### What is the meaning of 'Shear Failure in Glued Contact Surface' in the details of the RF-LAMINATE add-on module?

New FAQ 004206 EN-US

In the case of cross laminated timber panels not glued to the narrow sides and a wall-like structural behaviour, the torsion stress in the glued joints is often decisive. This design is performed according to the explanations in the literature reference below according to the following equation.

$\eta_x=\frac{\tau_{tor,x}}{f_{v,tor}}+\frac{\tau_x+\tau_{xz}}{f_R}=\frac{\displaystyle\frac{3\ast n_{xy}}{b(n-1)}}{f_{v,tor}}+\frac{{\displaystyle\frac{\frac{\partial n_x}{\partial x}}{n-1}}+\tau_{xz}}{f_R}\leq1$

Values:
• b board width
• n number of board layers
• nxy shear in pane plane
• $\frac{\partial n_x}{\partial x}$ shear of board layers
• $\tau_{xz}$ shear in thickness direction
• fR rolling shear strength
• fv,tor torsion shear resistance
For the y-direction, the design is analogous but with the values for the y-direction.
• ### In RFEM, I want to load a circular ring displayed as a member with the load generator. However, the curved member is not taken into account. What is the reason?

New FAQ 004205 EN-US

The function [Generate Loads → From Area Load on Members via Plane...] requires the defined plane to be created from a continuous line. If a curved member is created from arcs, the plane as a polygon cannot find the outer contour of the arc, because it is only an approximation. In short, curved members cannot be loaded by means of the load generator in RFEM.

In this case, it is recommended to display the curved member by means of several straight member segments. Thus, the continuous line can be run cleanly. In order to create the corner nodes of the polygon chain more quickly, it is advisable to prepare them e.g. in Excel, depending on the number of member segments. The numbering of nodes is important. The procedure is demonstrated in the video.

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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.

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