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RE: Cranes: Curved Track Monorail

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Rajendran,
You are partially right when you say that some of the
old methods were not recorded.  If you do enough digging
you will find some help - I remember reading something
of Ketchum(spelling?) to help with torsion and something
from Britain (ca 1950)on monorails when I was starting.
Gary

On 6 Jan 2005 at 7:40, Padmanabhan Rajendran wrote:

> Good point, Gary.
> 
> However, the design methodologies of the old,
> pre-computer-FEM, school have not been recorded for
> our benefit. I suspect the design in those days did
> not suffer from resource constraints we face nowadays.
> It was not uncommon for a design to go through cycles
> of checking and rechecking. Several structures, like
> the one you mentioned, might have evolved by trial and
> error. Even now, smaller structures in a typical
> industrial facility are constructed without any formal
> calculations. If it works, fine; If not, and nobody
> gets hurt, try something different. If OSHA breathes
> down the neck, call for outside help.
> 
> FEM or no FEM, it is important to visualize the
> structure behavior and determine the load path. I
> advocated FEM, but I must caution that it can generate
> outrageous results if handled by someone who cannot
> draw a free body diagram.
> 
> Incidentally, I belong to the OF school as well,
> except I try to stay with the latest technology. It
> has its advantages.
> 
> Rajendran
> --- Gary Hodgson & Associates <ghodgson(--nospam--at)vaxxine.com>
> wrote:
> 
> > David,
> > 
> 
> > I wonder how engineers (I belong to the OF school)
> > managed to design 
> > these before computers.  I have been in a plant with
> > a curved 
> > monorail that was built in 1918.   
> 
> 
> 
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