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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6689
Experience:  Structural Engineer
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I am in North Carolina and I need to size a steel I beam of

Customer Question

I am in North Carolina and I need to size a steel I beam for support of a deck using 2x8x10 floor joist. The beam will be set on 2 masonry columns and needs to span 32'.
All joists will set perpendicular on beam. simple design, just wondered about I-beam sizing...Thank you, Darrin
Submitted: 11 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 11 months ago.

Hello

Expert:  StructuralEng replied 11 months ago.

What is the joist length on each side of the beam? What is the city and state so I can look at snow loading?

Expert:  StructuralEng replied 11 months ago.

Do you need to clear span the 32'?

Customer: replied 11 months ago.
Clear span is 31'
Customer: replied 11 months ago.
8' of joist house side and 2' of joist cantelever. And house is in Zirconia NC
Expert:  StructuralEng replied 11 months ago.

Thank you. I will size the beam assuming you detail the joists to brace the be against lateral torsional buckling

Expert:  StructuralEng replied 11 months ago.

The beam will be sized for strength and deflection but I would recommend a full dynamic analysis to check for potential vibration problems for such a long clear span with a light structure

Expert:  StructuralEng replied 11 months ago.

You can plan for a W12x30 ASTM A992 Gr 50. It's 12" deep x 6.5" wide and weighs 30 pounds per foot

Customer: replied 11 months ago.
Wow that seems very large given only supporting small deck...is that minimum size recommended? Or are playing xtra safe?
Thanks!
Expert:  StructuralEng replied 11 months ago.

That's the right size. 31' is not a short clear span. And with the cantilever, it's the same as if the deck were 12'-6" wide in terms of loading on the beam.

Expert:  StructuralEng replied 11 months ago.

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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