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StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7135
Experience:  Structural Engineer
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Looking to remove a lolly column in my basement. Steel I

Customer Question

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
Expert:  StructuralEng replied 1 year ago.


Customer: replied 1 year ago.
Look forward to y our response. THX Mike
Expert:  StructuralEng replied 1 year ago.

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

Customer: 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: 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.
Expert:  StructuralEng replied 1 year ago.

That will add very little strength to the beam.

Customer: replied 1 year ago.
What are my options short of removing the beam and replacing with a bigger I beam?
Expert:  StructuralEng 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.

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

Customer: replied 1 year ago.
I have attached two photos of the beam. Its a lightweight 12 inch. So, what you are saying is to add 3/8" plates to each side of the beam and spot weld instead of bolts. The beam is 11" inside, so I can fit 10" plates on each side and weld top and bottom.
A TW welded to the bottom would bring the ceiling down too much. Sound like the way to go?
Expert:  StructuralEng replied 1 year ago.

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

Customer: replied 1 year ago.
How about C channels sandwiched together?
Expert:  StructuralEng replied 1 year ago.

Yes, but welding them can be problematic

Customer: 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.
Expert:  StructuralEng replied 1 year ago.

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

Expert:  StructuralEng 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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