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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6682
Experience:  Structural Engineer
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You helped with me a question about a month ago. Now I have

Customer Question

Hi -
You helped with me a question about a month ago. Now I have a new question. Do I go though Just Answer again?
This question is about bracing of steel stud walls.
Submitted: 9 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 9 months ago.

Hello

Expert:  StructuralEng replied 9 months ago.

I can help. What is your question?

Customer: replied 9 months ago.
Is there a way i can send you PDF files? it will be easier to explain the question if I can send you the print.
Expert:  StructuralEng replied 9 months ago.

You can attach a PDF through here or you can upload to mediafire.com and post the URL here for me

Customer: replied 9 months ago.
The question has to do with the REVCLOUD in the attached file. I'll type some notes and send them while the file is uploading.
Customer: replied 9 months ago.
Please notice the 'new room' on the left hand side of the drawing and the 'new comm closet' near it. These rooms are framed with light gauge steel studs to a height of 8 feet.Toward the right hand side of the drawing are two cross sections, one for each room. Originally the plan showed these rooms to be braced with alternating 45 degree braces at the top, attaching the new walls to the underside of the roof deck approximately 3-4 feet above. Due to the HVAC trunk line near the 'new room' we could only brace one side, and did so at 16" o.c. We did not brace the 'new comm room' walls or the short wall on the 'new room' as they were very short lengths and the carpenter didn't feel it was needed.The inspector said he would accept it if the architect modified the print to show that our 'as built' was acceptable. As you can see, the architect drew the changes but added language that says the modified construction must meet certain stresses. I've contacted the manufacturer but I only get pointed to the ASTM recommended guidelines for bracing, which unfortunately I don't have and frankly are a bit beyond my knowledge base.Can you tell me if the revised bracing is in compliance with ASTM C754?
Expert:  StructuralEng replied 9 months ago.

Unfortunately, that bracing is not stable.

Expert:  StructuralEng replied 9 months ago.

Meaning it doesn't stabilize the top of the wall.

Customer: replied 9 months ago.
i need to figure out a way to brace around the HVAC duct? If I were to install diagonal bracing at a decreased angle (say, 22.5 degrees) on the duct side, along with the 45 degree bracing on the other side, would that work?
Customer: replied 9 months ago.
I assume I should brace the short walls also, correct?
Expert:  StructuralEng replied 9 months ago.

A single diagonal won't work. That is not a stable solution. You will need two diagonals coming to the top of the wall. Make one as vertical as you can and do the other at 30 degrees, give or take

Customer: replied 9 months ago.
Ok. I already have the diagonals on one side at 45 degrees. I'll install the others at as close to 30 degrees as I can get.Can you send me an except of the ASTM standard that indicates this is acceptable? I'll need to show it to the inspector.
Customer: replied 9 months ago.
I have to step out for a few minutes. I'll check back later.
Expert:  StructuralEng replied 9 months ago.

That doesn't address bracing layout. Bracing layout is about making sure it's stable. If the one in place is near 45 degrees then install the next one as close to vertical as the duct will allow

Customer: replied 9 months ago.
Okay, I understand about the ASTM document. I should have asked the more appropriate question, "Can you provide me with some documentation that supports what the architect is saying in the REVCLOUD?"
Expert:  StructuralEng replied 9 months ago.

To take the 5 psf load?

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