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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6746
Experience:  Structural Engineer
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Steel I-beam span = 30 feet (a 30' x 37' room with the I-beam

Customer Question

steel I-beam span = 30 feet (a 30' x 37' room with the I-beam splitting it into two 17.5 feet sections
Total load including ceiling joist/roof beams/drywall/drywall mud/hardware/metal roof/trusses-roof supports, etc.--Everything except snow load in central PA
= 16970 lbs
Given that some of this load gets picked up by the outside walls and the 30 feet span has no posts in the middle, how large of an I-beam do I need
Submitted: 8 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 8 months ago.
Hello.
Expert:  StructuralEng replied 8 months ago.
Do you have trusses or rafters and joists?
Customer: replied 8 months ago.
Rafters and joist. Please see original question.
Customer: replied 8 months ago.
Please see attached files
Customer: replied 8 months ago.
If you need anything else, let me know
Expert:  StructuralEng replied 8 months ago.
Thank you. I asked about the trusses vs rafters and joists because it makes a big difference and the original question said trusses.
What is the city in PA so I can look at snow loading?
Customer: replied 8 months ago.
Marysville, PA in Perry County near Harrisburg
Expert:  StructuralEng replied 8 months ago.
You will need a W16x50 beam ASTM A992 Gr. 50 to limit total load deflection to 1". You will ask need to detail the joists to brace the beam laterally.
Expert:  StructuralEng replied 8 months ago.
The beam is 16" deep and weighs 50 pounds per foot
Customer: replied 8 months ago.
Thanks. Just one last question: I believe in over-engineering, what would be the next strongest size of I-beam.
Expert:  StructuralEng replied 8 months ago.
No problem. I'm happy to help. W16x57 or W16x67. Good luck with your project.

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