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What size steel beam do I need to clear span 30 feet? Do I…

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What size steel beam do...
What size steel beam do I need to clear span 30 feet? Do I need a box beam or I-beam?
Submitted: 2 years ago.Category: Structural Engineering
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1/23/2016
Structural Engineer: StructuralEng, Consultant replied 2 years ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,679
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Hello. How are you doing? I'll be happy to assist you

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Customer reply replied 2 years ago
What size steel beam do I need to clear span 30 feet? Do I need a box beam or I-beam
. I am using 4 inch steel post for a deck that is 30 X 50 feet.
Structural Engineer: StructuralEng, Consultant replied 2 years ago

Is it supporting 50' long joists?

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Customer reply replied 2 years ago
No The joists are 30 feet long. The beam will be 50 feet across 4 posts.
Structural Engineer: StructuralEng, Consultant replied 2 years ago

Do you want the joists sized or the beam? You used beam with the 30' span, so I assumed the joists were spanning the 50'

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Customer reply replied 2 years ago
I guess I should have ask what size joists to span 30 ft clear span
Structural Engineer: StructuralEng, Consultant replied 2 years ago

what kind of decking will you use and what spacing do you desire? Is this a residential deck?

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Customer reply replied 2 years ago
Composite decking on a commercial deck
Spacing will be 16 inches
Structural Engineer: StructuralEng, Consultant replied 2 years ago

I will assume you can attach the composite decking to the steel beams.

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Structural Engineer: StructuralEng, Consultant replied 2 years ago

Assuming a residential deck, W8x18 ASTM A992 Gr. 50 at 16" on center. Attaching the deck boards to boards to every beam is very important to the proper performance of the beams.

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Customer reply replied 2 years ago
I will strip it first
Customer reply replied 2 years ago
This is a commercial deck.
I plan to strip it before putting the composite deck down
Structural Engineer: StructuralEng, Consultant replied 2 years ago

What setting will the deck be used in?

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Customer reply replied 2 years ago
It is a recreation building and kids and adults will be sitting on the deck eating
Structural Engineer: StructuralEng, Consultant replied 2 years ago

That will make the beam larger

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Structural Engineer: StructuralEng, Consultant replied 2 years ago

W8x28 ASTM A992 Gr. 50 at 16" on center.

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Structural Engineer: StructuralEng, Consultant replied 2 years ago

Hello. Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.

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Structural Engineer: StructuralEng, Consultant replied 2 years ago

.

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