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Re: Bow String Truss

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Hey, us Michigan folks are half-Canadian to a large degree plus we like
our Canadian brothers and sisters to the south of us!

Scott
Adrian, MI


On Fri, 19 May 2006, Gary Hodgson & Associates wrote:

> You're living too close to the Canadian border.
> Gary
> > Maxwell Diagram, eh?
>
> > Scott
> > Adrian, MI
> >
> >
> > On Wed, 17 May 2006, Daryl Richardson wrote:
> >
> > > Scott,
> > >
> > >         You're on the right track, Scott.  We used to do just that back when
> > > I was a new graduate.  We even took it to the next step and drew vector
> > > force drawings (to scale, of course) and could thereby solve for all of the
> > > member forces in a truss.  Generally this was faster than many people today
> > > could enter the co-ordinates and member connectivities in a computer
> > > program.  The downside, of course, was that the procedure had to be repeated
> > > from the beginning for each load case.
> > >
> > >         You may be interested in knowing (in case you didn't already know)
> > > that the resulting vector diagram was called a Maxwell Diagram.
> > >
> > > Regards,
> > >
> > > H. Daryl Richardson
> > >
> > > ----- Original Message -----
> > > From: "Scott Maxwell" <smaxwell(--nospam--at)engin.umich.edu>
> > > To: <seaint(--nospam--at)seaint.org>
> > > Sent: Wednesday, May 17, 2006 2:29 PM
> > > Subject: Re: Bow String Truss
> > >
> > >
> > > Seeing as I was never a Boy Scout, I am going to offer up what you likely
> > > intented, but just not in "Boy Scout" language...why not just use trig
> > > stuff.  If you go a measured perpendicular distance to the
> > > truss span horizontally on the ground from the truss location and then
> > > sight up to the top and bottom of the truss and measure the angle of those
> > > sight lines, you then will have one leg of the triangle and the
> > > angle...you can then use trig to get the other leg (at least close enough
> > > likely for what you need).  This would get you the height to the bottom of
> > > the truss and the top of the truss.
> > >
> > > We did this back in high school to measure heights of trees and buidlings
> > > and signs.  And in reality, if you took a surveying class you did it with
> > > more "accurate" equipment.
> > >
> > > Regards,
> > >
> > > Scott
> > > Adrian, MI
> > >
> > >
> > > On Wed, 17 May 2006, John Riley wrote:
> > >
> > > > Can you use an approximation method found in any Boy Scout manual?  Seems
> > > > like a visual approximation would be far better than a rule-of-thumb
> > > > approximation.  JPRiley
> > > >
> > > >
> > > > Rich Lewis <seaint03(--nospam--at)lewisengineering.com> wrote:              Is there a
> > > > standard rise to run ratio that most bow string trusses would use?  I
> > > > canâ?Tt find anything regarding this in my text books.  I have a hanger
> > > > with a 120 ft. clear span.  I eyeball the truss height at 15-16 feet.  It
> > > > would take rental of a lift to verify it.  I want to check the wind load
> > > > on the building and would like to find a good approximation of the height.
> > > > The truss is fabricated from pipe.
> > > >
> > > >   Thanks for any insight you may be able to give.
> > > >
> > > >   Rich
> > > >
> > > >
> > > >
> > > >
> > > >
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