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I am going to build a bridge with a 26 foot clear span it

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I am going to build...
I am going to build a bridge with a 26 foot clear span it will be 14 feet wide and will have corrigated steel deck with 2 inch asphalt wearing surface
I am planing on use of 5 beams 12" x 6" wide on concrete abutments I will have to splice the beams as they are only 24' now , so I will make them 29' . I will put the splices every other direction and was planing one set of diaphragms midd span .
I will butt the beams and penetrate weld all around then weld a plate 12" long center on both flanges.
Do you see a problem with this plan?
Thanks
Brian
Submitted: 1 year ago.Category: Structural Engineering
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8/12/2016
Structural Engineer: StructuralEng, Consultant replied 1 year ago
StructuralEng
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Structural Engineer: StructuralEng, Consultant replied 1 year ago

How thick will the concrete deck be below the 2" asphalt wearing surface?

Is this a bridge on private property?

Do you have a desired load rating?

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Structural Engineer: StructuralEng, Consultant replied 1 year ago

Is your question about the beam size or the method of splicing the beams?

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Customer reply replied 1 year ago
No concrete just galv corigated steel deck with 1.5-2" asphaltThe bridge is on private propertyLoad for dump truck say 20 tonThe county has one built near me but this span is 3' longer but my beam spa will be a lot closer with the same beams and they have close to 3" of asphalt on thiers
Structural Engineer: StructuralEng, Consultant replied 1 year ago

You can't drive a dump truck over corrugated metal deck without concrete fill.

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Customer reply replied 1 year ago
There are two bridges within 1/4 mile of us over 20 years old that only have d deck and asphalt the one bridge they did not pave for two years built in speed bumps. That bridge was private the other is a township bridge, it was paved right away due to speed of the traveling public. There are still some decks with 2x4s on edge and tar chip as wearing course water proofing combo.
Customer reply replied 1 year ago
Go to contec website or big-R for this type of deck , my deck will be 27"between the edges of web with 1.5 ' overhang on each side.
Structural Engineer: StructuralEng, Consultant replied 1 year ago

Is your question about the beam size or the method of splicing the beams?

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Customer reply replied 1 year ago
Both
Structural Engineer: StructuralEng, Consultant replied 1 year ago

I will check the beam size, but not the deck. I will comment qualitatively only on the beam splice. Is that reasonable?

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Structural Engineer: StructuralEng, Consultant replied 1 year ago

Assuming your beams are W12x26 and each tire load is equally shared between two beams...

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Structural Engineer: StructuralEng, Consultant replied 1 year ago

It almost works for strength, but deflection is about 1.5". That is too high.

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Structural Engineer: StructuralEng, Consultant replied 1 year ago

The method of splicing you describe is reasonable, but the weld from the plate to the beam and the connection between the two end plates must be properly designed.

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Customer reply replied 1 year ago
Would the diaphragms help with the deflection
Structural Engineer: StructuralEng, Consultant replied 1 year ago

The metal deck diaphragm?

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Customer reply replied 1 year ago
No I want to put x bracing or say 10"" beams maybe mid span perpendicular to the beam line to stop any possible flop, and I also was figuring it would help spread the load to the adjacent beams. You have me concered with your 1.5" deflection. What would happen if I double stack 2 beam lines to make 24" beams in the wheel tracks?
Structural Engineer: StructuralEng, Consultant replied 1 year ago

Those beams would be brace beams, not a diaphragm. They will not help with deflection.

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Customer reply replied 1 year ago
I think I will have to go to a 14 "or 16 " tall beam. Correct
Structural Engineer: StructuralEng, Consultant replied 1 year ago
That will be the most efficient beam to use. You can use a 12" beam, but they'll be heavier and more expensive.
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Structural Engineer: StructuralEng, Consultant replied 1 year ago
W16x36 is the best beam for you to use. 16" deep and 36 pounds per foot
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