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Re: Bow String Truss

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Maxwell Diagram, eh?  So, the only thing that I want to know then is where
are my royalties???  <grin>

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
> >
> >
> >
> >
> >
> > ---------------------------------
> > Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.
>
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