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Re: Kneebraced Post Design

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It would be nice if the typical off-the shelf post-beam connectors (ex. Simpson's column caps) has the "tabulated" capacity to resist moment in addition to lateral and axial loads.

I know that Hardy and SidePlate manufactured their own moment frame called Hardy Frames: a neat structural option if you don't like to provide a knee brace.

Milo Zabala, PE


----- Original Message ----
From: Chris Slater <chris(--nospam--at)jdwylieengineering.com>
To: seaint(--nospam--at)seaint.org
Sent: Sunday, May 11, 2008 7:08:23 AM
Subject: Re: Kneebraced Post Design

Oh you're right.  I don't have my NDS here, but I'll bet that should
be more like 337.

Thanks Kevin!

Chris

On Sun, May 11, 2008 at 6:33 AM, Kevin Below <kbofoz(--nospam--at)gmail.com> wrote:
> Chris, I was looking at your formulas, thinking about lookup tables, and
> just happened to notice an error in cell B15 - the value for the 0.5 inch
> lag screw is way out of line.
>
>
>
> On Fri, May 9, 2008 at 6:42 PM, Chris Slater <chris(--nospam--at)jdwylieengineering.com>
> wrote:
>
> > 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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