Question about bracing garage wall
Question about bracing garage wall
(OP)
A client wants to have a 20' garage door and an 11' garage door on a 32' wall. This leaves 1'-8" on each side of the garage and 1'-8" in the middle. I have used the simpson strong tie wood strong wall portals before but the max opening is 16'-4". Anyone recommend any other options for providing the proper bracing for this scenario? Thank you.






RE: Question about bracing garage wall
BA
RE: Question about bracing garage wall
Is this residential design and is this a prescriptive panel or are you engineering the thing out? Also what is your seismic zone?
Also: What BAretired says is true... you are missing a lotta wall here. Don't forget that the true rough opening of a typical door is less than the specified size. when you are running so tight with fabricated components then you have to pay attention to this or you are on the phone with the contractor and concrete is already cast with major anchor bolt issues.
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MAP
RE: Question about bracing garage wall
When the length is less than 24" you usually have Simpson HDU-type hold downs or similar, and with all the multiple studs required, the hold downs become ridiculously close to each other.
Also it frequently becomes impossible to fit in all the required anchor bolts - but I use the hold down bolts for some of the shear. I know this isn't recommended but I have seen real-life construction of all this and it appears to me those bolts can transfer a lot of shear. I have to keep my designs constructible because I do a lot of design for semi-custom and custom homes.
RE: Question about bracing garage wall
RE: Question about bracing garage wall
DaveAtkins
RE: Question about bracing garage wall
RE: Question about bracing garage wall
How would I get it to work as a three sided diaphragm?
Thanks.
RE: Question about bracing garage wall
RE: Question about bracing garage wall
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Question about bracing garage wall
RE: Question about bracing garage wall
Mike McCann
MMC Engineering
RE: Question about bracing garage wall
How much wall would need to be provided to just construct a regular 2x6 wood stud wall without the bracing? Right now there is 1'-8" of wall on the ends and in the middle. What would the 1'-8" dimension need to be increased to? Thanks.
Are you saying you don't know how to design shearwalls? If you can't design and provide a 3- sided diaphragm, then you have to design the 3 short walls as a portal frame and use the appropriate detail from the IBC (it is similar to a Simpson Strong-wall but generic).
In other words, you cannot provide a prescriptive, IRC - type shearwall solution (with no calculation) with such short walls. I was suggesting 24" minimum because that what I found was practical.
RE: Question about bracing garage wall
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RE: Question about bracing garage wall
msquared, the wall are going to be 10'. My width of stud wall is 20" so the length it can be to stay within the 2.5:1 ratio is 50" so my stem wall would have to come up 70". Stem wall (70") + wood stud wall (50") = 120" or 10'. Is this correct?
RE: Question about bracing garage wall
That means that the maximum height of stud wall is 5'-10". And the height of the concrete stem wall needed would be 4'-2" for a 10 foot wall.
Oh, by the way, you will probably have to nail the *&^%& our of the stud wall.
Mike McCann
MMC Engineering
RE: Question about bracing garage wall
RE: Question about bracing garage wall
Is this above correct? Thank you.
RE: Question about bracing garage wall
As for the &*()^... yes.
Mike McCann
MMC Engineering
RE: Question about bracing garage wall
RE: Question about bracing garage wall
Mike McCann
MMC Engineering
RE: Question about bracing garage wall
RE: Question about bracing garage wall
Mike McCann
MMC Engineering
RE: Question about bracing garage wall
the 16'-4" opening limitation is due to the "portal frame" method using the panels. If you use the panel straight up to the wall plate you do not have this restriction. Just watch your collector forces.
The 3.5 ratio is for "shear walls" not shear "panels". So you must engineer this out. The 3 side idea occured to me too but there may be L/W ratio limitations... don't know how it applies to you. All in the NDS.
Also a moment frame could work. Use the fabricated steel panel also but then is seems like the wall braces may be just as good for you.
If the concrete wall is raise to make the wood wall shorter wouldn't it be just cheaper to add a few more cu.ft. of concrete to the truck and go all the way? (I know... if you are working with carpenters this is just not reasonable:).
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MAP
RE: Question about bracing garage wall
RE: Question about bracing garage wall
RE: Question about bracing garage wall
jimtheengineer10,
IMO, the simplest fix for your design, in your Seismic area, would be
the Simpson-Strongtie steel shear panel. The can be installed in
narrow wall sections down to 12" (max).
If you go this route, suggest you contact a Simpson-Strongtie rep. to
discuss your application. Also, when installing any engineered shear
panel, be sure to verify the manufacturer' min. width of any concrete
curb. Some are 4", others are 6" min.
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