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flyinghigh
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Wood I-beam Rafters.

11/18/2008 8:41 AM

Good morning. A prospective client wants to build a sizable barn with no trusses, no ceiling joists, and no columns. I am using 15psf DL and 30psf LL. The outer wall dimensions are 40 x 60 feet.

I would like to use wood i-joist type rafters, 16x2-9/16 BCI 6500-1.8DF 24"OC; and an S24x121 steel I-beam for the ridge beam. I am having difficulty finding a recommended attachment assembly for the two. I will call BC later today, but I thot I'd try you guys first. Does anyone know of a website that shows a good attachment design? Thx.
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Anonymous Poster
#1

Re: Wood I-beam Rafters.

11/18/2008 10:00 AM

Your answer could possibly be found in one of the many free design publications here:

http://www.awc.org/Publications/download.html
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Brave Sir Robin
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#5
In reply to #1

Re: Wood I-beam Rafters.

11/19/2008 2:41 PM

Thanks for the link. Lots of good reference information and most of it is free to download !!
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Anonymous Poster
#7
In reply to #5

Re: Wood I-beam Rafters.

11/19/2008 8:44 PM

Yeah - I wasn't entirely confident that the question would be answered - I just wanted to throw that very useful link out there in a "somewhat" appropriate thread.
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ba/ael
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#2

Re: Wood I-beam Rafters.

11/18/2008 7:36 PM

If the steel beam can be below the joists, use a wood nailer on top of the beam sloped to suit your roof pitch. The joists bear on the nailer. Place a stiffener between joists to prevent them from racking. Use steel straps bent over the ridge line and nailed to each joist to prevent joists from sliding down the slope.

You may find more ideas at this site. Detail H5 shows a good detail for flush framing with a wood beam. It can easily be adapted to a steel beam with a bit of wood packing bolted each side of the web...no problem.

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flyinghigh
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#3
In reply to #2

Re: Wood I-beam Rafters.

11/19/2008 8:45 AM

Good morning ba/ael. Thx for your expertise. I really appreciate it.
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babybear
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#6
In reply to #2

Re: Wood I-beam Rafters.

11/19/2008 5:57 PM

Hello Bruce,

You made some good points there. I helped build a completely wooden barn/house conversion, and the joists were a focal point.

I wonder why in this case there is a need for no wood showing? It is lovely stuff! You can also see how the whole structure is assembled.

Take care...........

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omw7
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#4

Re: Wood I-beam Rafters.

11/19/2008 8:57 AM

http://klh.at/index.php?id=161&L=3

see link above for another type of wood product: cross laminated timber.

it is essentially a very thick plywood, but read on, it is possibly the way of the future as there is very little wastage.

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babybear
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#8
In reply to #4

Re: Wood I-beam Rafters.

11/20/2008 9:23 PM

Hello omw7:

Welcome, as you seem to be a newbie! There is more and more of these composites used on furniture making now. It uses up most of the tree so makes sense. And the use in buildings has been going on for some time, as it is so strong. It is also used in boat building but, of course with hard-wood. I like most any natural wood products whether laminated or straight from the tree, they look great!

Take care......................

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 Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
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phoenix911
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#9

Re: Wood I-beam Rafters.

11/22/2008 7:55 AM

We have built the Avenger Class MCM's (Mine Counter Measure) for the US navy,

they had lamnated H-type beams but the spans are still limited.

you'd would be surprised of the joint design. but with the longer span one would have to design stess into it for the spans using Mohr's circle would help.

http://en.wikipedia.org/wiki/Mohr's_circle

What region, What is the yearly snow fall for snow loads.

I know you said you did'nt want trusses, but this company may be able to help you out to laminate what you want.

http://starwoodrafters.com/

check it out, When my dad rebuilt his barn after a fire, we were very happy with the quality and opening of the mow using these trusses

phoenix911

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Anonymous Poster (2); ba/ael (1); babybear (2); Brave Sir Robin (1); flyinghigh (1); omw7 (1); phoenix911 (1)

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