Connecting Angle to Beam/Joist with C-Clamp 1

[Chuckimus]

Hello, long time lurker and this is my first post. During a walkthrough of a new building nearing completion, I noticed the supports for an HVAC unit (2 angles) were connected to the flange of an I-beam and a steel joist with beam clamps (C-clamp?). It is my understanding that these are used to attach equipment to the flange of supporting members, but the contractor thinks they can be used to connect steel elements (as opposed to welding/bolting).

Is there anywhere in IBC or AISC that specifically addresses this? It seems common sense to me, but apparently not others.

 

[KootK]

Clearly, a clamp can be used to connect two steel members. They've done it. Of course, whether or not that's a good idea is another matter. If this were my baby, I'd be crying foul as follows:

1) Clamps might come off as a result of vibration or folks messing with them.

2) When clamps come off, the mechanical unit could squash some poor bastard.

3) KootK not comfy with the implied liability. Perhaps Joe Builder would be willing to take it on?

4) No? Too bad, so sad.





I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[Lomarandil]

They're used all the time for temporary falsework (and the California Falsework Manual has some guidance if you become inclined to justify it), but I agree with the reservations noted for permanent applications.

The largest risk in my mind is that vibrations loosen the screw over time.

 

[TLHS]

I don't have a problem with beam clamps in light duty applications, but I do have a problem with that kind of beam clamp. There's nothing keeping it from slipping out.

I'd want something more along the lines of these:

http://www.beamclamp.com/connection-solutions/category/steel-to-steel

 

[Chuckimus]

My thoughts exactly. There's nothing to prevent this thing from shaking loose over time. It's in a bus maintenance facility too, there will constantly be people walking around underneath.

Ultimately, we have to provide our own CO, so I'll just say no until they fix it.

 

[bridgebuster]

Do the contract documents detail a connection? Even a contractor with half a brain knows clamps aren't a permanent connection. I've seen contractors play dumb in the hope of an extra.

 

[BUGGAR]

I like it when they use clamps on light gage purlins and fold the stiffening lip down flat.