A heavy duct is hung from an open-web joist bottom chord

Do not put heavy point loads on a joist chord without approved structural direction. Hold the load and move to an approved distributed support detail.

Seismic Bracing & Structural Coordination 4th Year RED

Watch out

Do not wrap heavy duct straps around random joist chords or web members.

Check

Identify exactly what member is carrying the load.
Look for twisting, bowing, weld cracks, or strap movement.
Check structural/hanger drawings for approved joist loading.
Temporarily support duct before moving hangers.
Do not resume until the load path is approved.

Steps

Identify exactly what member is carrying the load.
Look for twisting, bowing, weld cracks, or strap movement.
Check structural/hanger drawings for approved joist loading.
Temporarily support duct before moving hangers.
Do not resume until the load path is approved.

Say this to your foreman

This heavy duct/plenum is being carried by the open-web joist bottom chord at [location]. I see the steel twisting. Do you want us to hold and get an approved bridge/panel-point support detail?

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