Capacity check for embedded angle in concrete wall

[TeemoshenksEIT]

I am designing an electrical trench with floor elevation at -4'-00". This pit has a false floor at elevation 0'-00", for which I have placed beams to pick up electrical equipment and steel plates.Some of the equipment are near the trench wall and hence I need embedded angles in the trench wall to which I am welding another angle that will pick up the equipment along with the floor plates. For the connection of the angle to the embedded angle, what I have thought of is to make slotted holes every 12" along the connecting angle and plug weld it to the embedded angle. I have attached a quick drawing I made to show you guys what I mean.

I have a couple of questions:
1. How do I check the capacity of the embedded angle? Do I check anchorage for this?
2. As the connecting angle (supporting the equipment) is laterally restrained, I can't see it bending. However its toe is in compression so Local leg buckling and leg yielding is possible, right?

Thanks for the help everyone.

 

[TeemoshenksEIT]

dik, the layout has been frozen by electrical and the client.

 

[dik]

Can you notch the plate for the equipment... your latest consideration addresses the anchorage issue a bit but is more costly... it's the client's nickel...

Dik

 

[r13]

Like this.

 

[dik]

or like:

Dik

 

[dik]

Retired13... or like

Dik

 

[r13]

dik's detail is correct, that your edge angle and the I beam shall set below the finished floor for a distance equal to the thickness of the trench cover plate, otherwise, it is considered tripping hazard.

For my detail, I would provide slot hole at one end for ease of connecting. But you shall protect/mark the small bend connection plate, or angle, to avoid personal body injury.

 

[r13]

dik,

Your detail is good if the plate is stiff enough to support the equipment that seating adjacent, but not directly on the trench wall. For stiff plate, you won't need other helps in red, it will sit tight by weight. Also, another thing in mind is that, it usually will have cables, or conduits, coming out from the bottom of the equipment, and into the trench. It can be handled by bore holes through the plate though.

 

[TeemoshenksEIT]

Thank you very much guys, I appreciate all the ideas. I am currently emailing electrical to ask if they can move the equipment. The whole problem started with them laying out all the equipment without consulting structural.

 

[dik]

That's not the first time that's happened... and, likely won't be the last. Good Luck... you can maybe move the trenches...

Dik

 

[dik]

retired13:
That's a whole other issue and a different trench design... when it comes from the bottom...

Dik

 

[r13]

dik,

Yes. A lot of electrical/electronic housing came with open bottom to allow cables through, and release heat.

 

[TeemoshenksEIT]

That's correct, all the equipment are bottom fed, which is why wherever there is equipment it will only be supported on structural members and will not have plates underneath.I have setup a meeting with electrical on Monday to go over the drawings and 3D model. Hopefully I can convince these electrical folks.

 

[r13]

Good luck. In this type of project, the electrical is the lead, and dominate the equipment layout, which has strict space limitations. We have used wide flange in the trench to support heavy electrical cabinets.