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Removing central wall on 1st floor. The floor joists above…

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Removing central wall on 1st...
Removing central wall on 1st floor. The floor joists above meet above this wall. Need a beam which can replace the wall. Any type of steel, flitch, etc. is acceptable. Would like to know the correct size for standard deflection.1) Length of the Beam
18’ 6” assuming 3” bearing on each end.
2) What is it supporting (1rst, 2nd floor, roof etc?)
2nd floor & attic.
3) The length of the floor joists on either side of the beam/ or one side if it is an exterior wall
12.5’ on one side, and 19’ on the other. Both of these measurements include a 2' cantilever / overhang which is outside of the outer walls of the house. ie, the second floor is 4' wider than the first.
4) Any point load on the beam? If so where is it located on the beam?
No
5) Any height restriction on the beam
I’d like to fit it within a 2x10 depth which is 9.25”.Thanks!
Submitted: 8 months ago.Category: Structural Engineering
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12/15/2017
Structural Engineer: StructuralEng, Consultant replied 8 months ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,756
Experience: Structural Engineer
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Customer reply replied 8 months ago
Hello
Customer reply replied 8 months ago
live call- no thanks
Structural Engineer: StructuralEng, Consultant replied 8 months ago
Will it support any ceramic tile?
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Customer reply replied 8 months ago
there are two bathrooms on the second floor which have some tile - wall & floor
Structural Engineer: StructuralEng, Consultant replied 8 months ago

I'm going to size a I beam.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

You can't meet the deflection requirement for ceramic tile (L/600) with that depth beam with a reasonable weight with your span and loading. A W8x67 (9" deep and 67 pounds per foot) will work for strength and deflection.

For a flitch plate beam, you would need four 1.75" x 9.25" LVL with three 1.25" x 9.25" steel plates bolted together. That is required to meet deflection, not strength.

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Customer reply replied 8 months ago
for those two options, what deflections would be expected?. If I understand it correctly both would exceed l/600?Thanks
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Both would NOT exceed L/600. L/600 is the limit.

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Customer reply replied 8 months ago
Okay but I'm confused now because your earlier message read "You can't meet the deflection requirement for ceramic tile (L/600) with that depth beam with a reasonable weight with your span and loading."Why did you say that of in fact we can meet that deflection?Also - what deflection would you design for if there were no ceramic? And would that change the break design at all?Thanks
Customer reply replied 8 months ago
Sorry typo. Didn't mean "break" but beam.
Structural Engineer: StructuralEng, Consultant replied 8 months ago
A W8x67 beam is not a reasonablenweifht
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Structural Engineer: StructuralEng, Consultant replied 8 months ago
Reasonable weight
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Structural Engineer: StructuralEng, Consultant replied 8 months ago
120 pounds per foot of plate thickness is also not reasonable
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Customer reply replied 8 months ago
Thank you for the clarification.When you say not reasonable - do you mean that the beam is so heavy it is impractical to work with? Or were you thinking about the supports that would be required? Or something else?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

That it's VERY atypical for a beam. A W8x67 is generally a column section. And, while it can be used as a beam, it's not practical... but it CAN be used. It's just not an efficient use of material and will weigh 3x what it should

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Customer reply replied 8 months ago
I see. Since this would be so unconventional, can you recommend any alternative? For instance, should we use two parallel beams to divide the load? If so we might have to provide footings for them. For the single beam I think the supports would land on the steel supports already in the basement.Assuming we go with the single beam, would wood 2x support columns be sufficient or would we need to look into a steel column?Thanks
Customer reply replied 8 months ago
Haven't received a reply to my last comment yet but the site keeps asking me to rate this answer.
Structural Engineer: StructuralEng, Consultant replied 8 months ago

The single beam will be the lightest weight. The only real alternative to lighten the structure is to use a deeper beam.

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Customer reply replied 8 months ago
Were my questions about support columns outside the scope of a single question on this site? I've never posted here before.
Structural Engineer: StructuralEng, Consultant replied 8 months ago
They're not outside the scope, I'm saying that would be even more impractical.
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Customer reply replied 8 months ago
Ok. I also had asked would wood 2x support columns be sufficient or would we need to look into a steel column?
Structural Engineer: StructuralEng, Consultant replied 8 months ago
I would not recommend would support columns for the steel I-beam. You could potential he use would support columns for the flitch plate
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Structural Engineer: StructuralEng, Consultant replied 8 months ago
Potentially
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Customer reply replied 7 months ago
With the flitch beam, would more steel plates reaching the same total thickness be equivalent? This looks to be less expensive in materials.-----Could a box tubing profile take the load with less weight per sqft? Or any other standard profile for that matter?Thanks
Structural Engineer: StructuralEng, Consultant replied 7 months ago
That would be acceptable.Hey rectangular tube will be more efficient, and last week, then the plates, but still heavier than the I beam
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Customer reply replied 7 months ago
If we need to pass wiring or plumbing through either the W or flitch beam, is it OK to drill through following typical rules of thumb for hole location? ie not in the middle 1/3 of the beam (lengthwise), and in the center of the beam top-bottom but holes < 1/3 of the height?Also for the flitch - is there a standard bolting pattern that should be used? Grade & size of bolts?Thanks
Structural Engineer: StructuralEng, Consultant replied 7 months ago

Aactually, the middle third lengthwise is ideal

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Customer reply replied 7 months ago
Thanks for the correction about the drilling location.What about the bolt pattern?
Structural Engineer: StructuralEng, Consultant replied 7 months ago

5/8 " diameter in two rows of 16". Stagger the upper and lower rows by 8". Provide 2 1/2" edge distance top and bottom.

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Structural Engineer: StructuralEng, Consultant replied 7 months ago

ASTM A307 Bolts

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Structural Engineer: StructuralEng, Consultant replied 6 months 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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