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How can I display the local axis systems in RFEM and reverse the local axis z?

Answer

Each surface in RFEM has a local coordinate system (x,y,z).

The x- and y-coordinates lie in the surface, z stands perpendicularly on the surface. The top and bottom side of a surface is determined by the direction of the z-axis.

The direction in which the local z-axis is showing is the bottom side of a surface. Normally, the local z-axis points downward. Depending on the definition direction of the boundary lines and the order by which the lines have been clicked, it may be possible, however, that the local z-axis points upward.

But this can be corrected very easily. Please set the display of the local surface coordinate systems first.

Follow the instructions below:

Set the Display navigator on the left side of the screen.

Select "Model" - "Surfaces" and tick the check box of the entry "Surface Axis Systems x,y,z"..

To reverse the direction of the local z-axis, right-click the relevant surface now to open the surface context menu where you select the entry "Reverse Local Axis System".

A rotation of the local axes x and y is not possible. The direction of these axes depends directly on the global axis and the position of the surface towards it. For example, if you define a surface in the x,y-plane, the local axis x runs in the direction of the global axis X. Now, if you tilt this plate out of the plane, the local coordinate system rotates automatically.

Keywords

Reverse Coordinate System Axis Axis system

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  • Updated 21 October 2020

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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