i want to build a 20 x 40 single story structure on spead footings 20 ft on centers. what size i beam or concrete beam could span the 20 ft span. normal residential loading assumed.
nothing this is my first query
I can help
Can you look at the file I just attached and answer the questions at the bottom of the page? This will give me the information that I need to adequately size a beam for you. Thanks
Before we get started I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for informational purposes only (general sizing and budgeting) and is based on the information provided by you. The only loads considered for this member sizing are vertical loads, no lateral loadings were considered. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted.
Will you have roof trusses that clear span the 20' direction?
Do you have a span length that you are thinking of for your perimeter beam? Thinking of 13.33' spans to make 3 spans on the 40' side.
OK, let me run some numbers. I was going to try engineered timber beams?
Do you know what I beam sizes you may be able to get? Also what steel grade, 36 ksi or 50 ksi?
OK, I will size 50 ksi steel beam for you. Hold on a few minutes. Thanks
I can give you a couple of 50 ksi steel beams to span your 20' at your perimeters.
You can use a W10x26 (50 ksi) steel beam. The beam is 5.75" wide, 10.375" deep and weighs 26 pounds per linear foot.
You can use a W12x22 (50 ksi) steel beam. The beam is 4" wide, 12.25" deep and weighs 22 pounds per linear foot.
You need to physically connect your floor joists to your steel beams for lateral support.
I am running the wood numbers right now.
I can give you a couple of engineered wood options:
5-1/4” x 16” Versa-Lam 2.0 3100 SP
5-1/4” x 16” Versa-Lam 2.0 3100 DF
These are Boise Cascade products and you can go to the following link to find distributors in your area. http://www.bc.com/wood/ewp/distributors.html
As for your footings for your posts, assuming 2,000 psf bearing capacity, you will need a 30"x30" concrete footing that is 15"deep
You are correct. This will give you some numbers to budget/plan with.
Over 27 years of Structural Engineering experience