PyritePrinting
Erection sequence and temporary stability
Standing under its own weight does not establish stability for an incomplete frame. Use this demonstration in erection safety training to separate temporary bracing from the completed lateral system.
An upright model is not the same as a completed lateral system. Justice compares temporary support with the changing model as permanent wall, roof and end-wall bracing are added. Watch which parts move together and how the available load path changes.
Authored explanation · separate from narration
A partly erected metal building does not yet have all the members and connections of the finished structure. Being upright and bolted together answers a different question from being stable in its current construction condition.
Justice's post describes temporary guys remaining on the model while wall and roof bracing are completed. The teaching point is the transition between structural conditions, rather than a visual rule for deciding when supports can be removed.
Use this topic to discuss what changes as a system is completed and why erection-stage stability needs its own planned support. The model does not establish an acceptable temporary-bracing design or removal condition for a real project.
This physical model illustrates concepts, not a project-specific erection sequence, temporary-support design, brace-removal condition or measured wind-resistance test. Real erection stability depends on the actual members, connections, temporary works and erection plan.
No brace-removal timing, field sequence or temporary-support design is prescribed.
Transcript checked against the recording.
What happens when a windstorm hits your building while it's being erected?
To help with that, we install temporary bracing.
While it's still pretty flimsy comparatively, it has some resistance.
If we go and add in the permanent bracing, especially if we add it in during the erection phase, we have a complete load path and the final resisting system.
If we come in and add in the permanent bracing, we can see that this side is very stiff, while this side is still pretty flimsy.
However, if we go and add in the roof bracing, while it still deflects, you can see it has less deflection on this back wall.
If we come in and tie in this end wall, we can see that there is even less deflection, since this is helping to contribute to the resisting system.
Bring it into the conversation
What parts of the intended lateral system are still absent in this model configuration?
A physical point of reference
Explore the model used for these teaching and customer conversations.
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