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RE: Kneebraced Post Design

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I got the link to work alright, thanks. What I meant to ask for was the
connection detail showing edge distances, spacings, etc.

Michel



> -----Original Message-----
> From: chris.slater(--nospam--at)gmail.com [mailto:chris.slater(--nospam--at)gmail.com]On Behalf Of
> Chris Slater
> Sent: Friday, May 09, 2008 3:43 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Kneebraced Post Design
>
>
> Here's a better link to the spread sheet.  I think that makes clear
> what we're doing, since it has a diagram in it.
>
> http://examplecalcs.com/kneebrace.xls
>
> On Fri, May 9, 2008 at 3:32 PM, Michel Blangy
> <mblangy(--nospam--at)satco-inc.com> wrote:
> > Chris,
> >
> > This kind of thing is right up my alley. I remember doing a
> raised deck for
> > a frat house in Boulder, CO about 10 years ago that had a hot tub on it!
> > That one used knee braces and was very stout, however, I have
> on occasion a
> > need for the type you describe. Is there anyway you could provide more
> > detail of your connection?
> >
> > Michel Blangy, P.E.
> >
> >
> >
> >
> >> -----Original Message-----
> >> From: chris.slater(--nospam--at)gmail.com [mailto:chris.slater(--nospam--at)gmail.com]On
> Behalf Of
> >> Chris Slater
> >> Sent: Friday, May 09, 2008 2:47 PM
> >> To: seaint(--nospam--at)seaint.org
> >> Subject: Kneebraced Post Design
> >>
> >>
> >> Tried sending this earlier, and it never made it.  I'm assuming the
> >> list doesn't like attachments.  Instead, I've included a link to the
> >> file on my web server.
> >>
> >> --
> >>
> >> A lot of our firm's work is residential, and of that, a moderate
> >> percentage is small additions and remodels.
> >>
> >> One thing that we see very often (and more frequently as jurisdictions
> >> start getting tougher about requirements) is small covered patio
> >> additions.
> >>
> >> Engineering the lateral support for these is tricky.  The favored
> >> solution for owners and contractors is to kneebrace the support posts.
> >> We've done this in the past, and made it work for small patios, using
> >> NDS combined lateral and pullout values for Lag Screws, and an R value
> >> of 4.5 (UBC).
> >>
> >> In the new code, we have to use R=1.5, which means that even for a
> >> small patio, the seismic load is fairly high, and it is very difficult
> >> to make this work.  However, in an effort to not have to specify steel
> >> columms for every little patio we engineer, we've tried to look at
> >> other options, such as 1/4" steel side plates with either lag screws
> >> or through bolts.
> >>
> >> I developed a spreadsheet, using the NDS equations, that gives options
> >> based on what we put into it.  I've attached the spreadsheet to this
> >> e-mail (actually, it's here:
> >> examplecalcs.com/Kneebraced%20Post%20Design.xls)
> >> and would appreciate it if any of you had time to review it and
> >> offer feedback.  If you find it useful, please feel free to keep a
> >> copy.
> >>
> >> So the request for feedback is my first request.  But I also am
> >> interested in what others are doing with regard to small patios and
> >> knee braced posts.  I know that this type of thing falls way below the
> >> radar of many on this list, but it is something we run into very often
> >> in our practice.
> >>
> >> Thanks,
> >>
> >> Chris Slater
> >>
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