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I've got someone wanting to replace a beam on a load bearing…

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I've got someone wanting...

I've got someone wanting to replace a wood beam on a load bearing wall. 17ft span sup porting shingle roof. Wanting to replace with I beam. Steel columns on both ends. Trying to figure a beam size that will be suitable for this

Submitted: 8 months ago.Category: Structural Engineering
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Answered in 9 minutes by:
9/16/2017
Structural Engineer: StructuralEng, Consultant replied 8 months ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,660
Experience: Structural Engineer
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Hello

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

I can help.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

Is it supporting a roof only?

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Customer reply replied 8 months ago
Hello
Customer reply replied 8 months ago
It took me a second but I'm here
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Can you see my question?

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Customer reply replied 8 months ago
Are you there. I need to find out what size steel I beam I can use for a 17ft span with iron columns on each end for support. Same size as whatever beam is used.
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Are you able to see my question about the roof?

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Customer reply replied 8 months ago
No I'm fine with online
Structural Engineer: StructuralEng, Consultant replied 8 months ago

What is the rafter length on each side of the beam?

What is the city and state so I can look at snow loading?

Will it support anything other than the roof?

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Customer reply replied 8 months ago
No
Customer reply replied 8 months ago
No I can't see question
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Can you see these?

What is the rafter length on each side of the beam?

What is the city and state so I can look at snow loading?

Will it support anything other than the roof?

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Customer reply replied 8 months ago
I see now. They look 12 to 16 ft on each side of beam. Dickinson tx
Customer reply replied 8 months ago
A roof only
Customer reply replied 8 months ago
Roof , rafters and sheetrock
Structural Engineer: StructuralEng, Consultant replied 8 months ago

You can plan for a W8x28 beam ASTM A992 Gr. 50. The beam is 8" deep and weighs 28 pounds per foot.

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Customer reply replied 8 months ago
How wide is the flanges
Customer reply replied 8 months ago
How much weight is that beam good for
Structural Engineer: StructuralEng, Consultant replied 8 months ago

6.5" wide.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

It's limited by deflection at 650 pounds per linear foot.

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Customer reply replied 8 months ago
Is there a 4in wide beam thick enough that could support the same weight
Structural Engineer: StructuralEng, Consultant replied 8 months ago

No. As beams are able to support more weight, the flanges get naturally wider.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

A W12x19 can (it's 12" deep and 4" wide), but bracing against lateral torsional buckling becomes critical.

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Customer reply replied 8 months ago
Ok. Would stiffness between flanges help with that
Customer reply replied 8 months ago
Stiffners
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Not with bracing against lateral torsional buckling. You will need to detail the rafter connections to brace the beam in accordance with AISC 360

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Customer reply replied 8 months ago
Will have to attach them somehow to it. As far as the columns for post. Same size beam correct
Customer reply replied 8 months ago
I'm not sure if roof attatched to existing wood beam or just sits on it
Structural Engineer: StructuralEng, Consultant replied 8 months ago

No. That is not a column section. You can use a pipe column 4" nominal (4.5" O.D.)

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Customer reply replied 8 months ago
What schedule pipe. I'd rather us steel though but pipe would serve same purpose
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Pipe is steel. A53 steel.

Schedule 40

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Customer reply replied 8 months ago
I forgot a word. Meant steel beam. Ok then . That Pretty Well Sums It up. You have given me enough information. I should be good from here
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Happy to help. Good luck with your project.

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Customer reply replied 8 months ago
Thanks.
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