FAQ 004636 | How can I determine the orientation of a nodal support perpendicularly to a line?

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First Steps with RFEM

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08/19/2020

001736

Sonja von Bloh

RFEM

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Question

How can I determine the orientation of a nodal support perpendicularly to a line?

Answer

Each nodal support has a local axis system X', Y', and Z'. By default, it is oriented parallel to the global axes X, Y, and Z. The "User-defined axis system" option, allows you to rotate the local axis system of the support (Figure 01).

Figure 01 - Axis Systems for Supports

If you want to align the nodal support perpendicularly to a line, you can use the "Same as line" option (Figure 02). The "Same as line" option is only available for straight lines. The local axis system of the support is aligned parallel to the local axis system of the line. The local axis system of the line can be displayed in the Project Navigator - Display using Model → Lines → Line Axis Systems x,y,z (Figure 03). The axis system of the line can be influenced by the line direction and line rotation. To change the line direction, right-click the line and select the "Reverse Line Orientation" option in the shortcut menu (Figure 04). The line rotation can be set in the "Rotation" tab of the "Edit Line" dialog box (Figure 05).

Figure 02 - Editing User-Defined Axis System - Same as Line

Figure 03 - Activating Local Line Axis Aystems x, y, z in Display Navigator

Figure 04 - Reverse Line Orientation

Figure 05 - Edit Line - Rotation

As an alternative, you can determine the orientation of the axis system of the nodal support by using a user-defined coordinate system or by specifying three nodes perpendicular to the line.

The three options are shown in the video. For the orientation of the support axis system using a user-defined coordinate system or the specification of three points, an auxiliary straight line is created perpendicular to the line. Thus, it is easily possible to align the axis perpendicular to the line.

Keywords

Dlubal FAQ Nodal support Support axis system Rotation Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 01/07/2021

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