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Looking to remove a lolly column in my basement. Steel I

Customer Question
Customer: Hi. ***** *****. Looking...
Customer: Hi. ***** *****. Looking to remove a lolly column in my basement. Steel I beam runs from the foundation, over said lolly to a second lolly. Its a lightweight beam 12 inch. The total span is 20 feet.
JA: Thanks. Can you give me any more details about your issue?
Customer: The house is a ranch style. So the steel is holding up the main floor joists and above the main floor is the attic with gable roof.Im thinking about getting two steel flitch plates, 3/8" X 10" X 20 feet. Stack drilled, staggered 12 inches apart.
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Submitted: 1 year ago.Category: Structural Engineering
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Answered in 21 minutes by:
1/14/2016
Structural Engineer: StructuralEng, Consultant replied 1 year ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,380
Experience: Structural Engineer
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Hello

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Customer reply replied 1 year ago
Look forward to y our response. THX Mike
Structural Engineer: StructuralEng, Consultant replied 1 year ago

A flitch plate beam is made of wood and steel. Is that what you want?

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Customer reply replied 1 year ago
No. There are two 10 foot long lightweight steel I beams (12" high) joined on a lolly column to be removed. The joint is welded.
We are thinking we should plate both sides of the beam with 3/8 x 10' steel and bolt through with 1/2 inch bolts staggered at 12" apart.
Customer reply replied 1 year ago
The steel plates are 20 feet long. We could also use a channel which is heavier and a bit harder to install.
Structural Engineer: StructuralEng, Consultant replied 1 year ago

That will add very little strength to the beam.

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Customer reply replied 1 year ago
What are my options short of removing the beam and replacing with a bigger I beam?
Structural Engineer: StructuralEng, Consultant replied 1 year ago

You will have to reinforce the beam, either with plates welded to the top and bottom flanges (not inside the web), or a WT welded to the bottom. I can design this reinforcement, including the welding requirements, and provide a recommended procedure to install it without shoring, as an additional service, if you're interested.

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Customer reply replied 1 year ago
We are considering welding versus stack drilling/ bolting. Is that what you are referring to? What's a WT? Thx
Structural Engineer: StructuralEng, Consultant replied 1 year ago

I'm not sure what you mean by stacking, but these would be welded. A WT is a T shaped piece.

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Structural Engineer: StructuralEng, Consultant replied 1 year ago

No. Welding to the sides will not do enough. You need to add material to the top and bottom flanges.

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Customer reply replied 1 year ago
How about C channels sandwiched together?
Structural Engineer: StructuralEng, Consultant replied 1 year ago

Yes, but welding them can be problematic

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Customer reply replied 1 year ago
right. I dont think I can weld them. I can have them stack drilled, put in place, and then would just need to drill through the existing beam. the steel co recommends 5/8" holes for 1/2" bolts, staggered holes every 16 inches or something. Will discuss with the steel co.
Structural Engineer: StructuralEng, Consultant replied 1 year ago

They will be smaller than the WF. That is not going to do it

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Structural Engineer: StructuralEng, Consultant replied 1 year 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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Structural Engineer: StructuralEng, Consultant replied 1 year ago

.

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