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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7255
Experience:  Structural Engineer
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We are building a brewery on a concrete deck with 60 psf

Customer Question

we are building a brewery on a concrete deck with 60 psf live load rating. we are placing 4 tanks of 2400 lbs each over a 15' span. What size beam between columns will be sufficient?
Submitted: 2 years ago.
Category: Structural Engineering
Expert:  StructuralEng replied 2 years ago.

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

Expert:  StructuralEng replied 2 years ago.

The live load rating of the existing slab is 60 psf?

Expert:  StructuralEng replied 2 years ago.

Do you know anything about the structure? Is it a one way beam and slab? flat plate? precast? post tensioned?

Customer: replied 2 years ago.
Not sure, just a commercial office building about 6 year old. The floor we are on is a slab on columns and beams
Expert:  StructuralEng replied 2 years ago.

What is the size of each tank?

Customer: replied 2 years ago.
Tanks are 43" diameter by 92" height and hold 7 barrels, but only filling to 6 barrels each. Dead weight is 665 lbs x 186 gallons (6 barrels x 31 gallons per barrel) of wort at 8.8 lbs
Customer: replied 2 years ago.
Sorry, 665 lbs + wort
Expert:  StructuralEng replied 2 years ago.

I can provide you with the beam size to carry this load on a 15' span, but you will need to ensure it's compatible with the existing structure. Sometimes adding beams (especially with concrete construction) can change the behavior and cause more harm than good.

Expert:  StructuralEng replied 2 years ago.

You can plan for two W8x18 beams ASTM A992 Gr. 50. They are 8" deep and weigh 18 pounds per foot.

Customer: replied 2 years ago.
There is a 16" beam there now. we are trying to find out if we need to pour on top of or support from below. We have access and permission to use basement area for column if needed
Expert:  StructuralEng replied 2 years ago.

The loads you have exceed 60 psf. Therefore the prudent thing to do is to add a new beam to support the new load and to bypass the existing structure as much as possible.

Expert:  StructuralEng replied 2 years ago.

The beams were sized to support ONLY the weight of the 4 tanks.

Customer: replied 2 years ago.
Sorry, I have not been clear. Structure is existing. We are just setting up tanks on beam and need to know if adding column (or 2) under beam will help, or if we should pour reinforced slab on top of beam, or if we won't be able to use this space.
Expert:  StructuralEng replied 2 years ago.

I understand that. That is why I made the statement above.

Expert:  StructuralEng replied 2 years ago.

Your load is greater than the 60 psf allowable live load.

Expert:  StructuralEng replied 2 years ago.

Is the beam concrete or steel? You can certainly make modifications to use it, but you can't use it as-is

Customer: replied 2 years ago.
Steel I beam. I'd say 8", but that is guessing. Would you recommend adding column below? We are told the footing is wide enough and continuous.
Customer: replied 2 years ago.
8" X 16"
Expert:  StructuralEng replied 2 years ago.

There is probably no footing below.

Expert:  StructuralEng replied 2 years ago.

Why would they add a footing where one is not needed because a post doesn't exist?