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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6681
Experience:  Structural Engineer
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What size steel beam do I need to clear span 30 feet? Do I

Customer Question

What size steel beam do I need to clear span 30 feet? Do I need a box beam or I-beam?
Submitted: 10 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 10 months ago.

Hello. How are you doing? I'll be happy to assist you

Customer: replied 10 months 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.
Expert:  StructuralEng replied 10 months ago.

Is it supporting 50' long joists?

Customer: replied 10 months ago.
No The joists are 30 feet long. The beam will be 50 feet across 4 posts.
Expert:  StructuralEng replied 10 months 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'

Customer: replied 10 months ago.
I guess I should have ask what size joists to span 30 ft clear span
Expert:  StructuralEng replied 10 months ago.

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

Customer: replied 10 months ago.
Composite decking on a commercial deck
Spacing will be 16 inches
Expert:  StructuralEng replied 10 months ago.

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

Expert:  StructuralEng replied 10 months 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.

Customer: replied 10 months ago.
I will strip it first
Customer: replied 10 months ago.
This is a commercial deck.
I plan to strip it before putting the composite deck down
Expert:  StructuralEng replied 10 months ago.

What setting will the deck be used in?

Customer: replied 10 months ago.
It is a recreation building and kids and adults will be sitting on the deck eating
Expert:  StructuralEng replied 10 months ago.

That will make the beam larger

Expert:  StructuralEng replied 10 months ago.

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

Expert:  StructuralEng replied 10 months 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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