Rendering of Arc-Shaped Members

Tips & Tricks

When modeling arc‑shaped members, the problem shown in the figure may occur. It seems as if the member cross‑section is twisted or the load applied on the local z‑axis changes its direction. How does this come about?

In principle, the program tries to align the local z‑axis of members downward (global -Z). In the case of arched members modeled in the XZ or YZ plane, this leads to a change of the local coordinate system. This change causes the problems in rendering on the one hand and explains the change of load direction on the other hand.

In order to prevent this behaviour, you can define the member rotation via help nodes in the ‘Edit Member’ dialog box. If you select the option ‘Inside’ as well as ‘x‑z’, the local z‑axis of the member will be oriented to the center point.


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