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RE: Cable Tie Down for FRP Tanks

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I presume this hold-down is like a strap over the top of the tank that ties
it down to a slab.  I see this the same as a rope over a pulley.  The rope
has the same tension in either leg so the rope is in equilibrium and does
not move over the pulley.  If the uplift on the tank is 1000 lbs. then each
rope leg has a 500 lb. tension in it, with the pulley seeing the 1000 lb.
total.  This uses a simplifying assumption that there is only one tie-down
(with two legs) for the tank.  Actually, since the system is in equilibrium,
you could consider the tie downs individually fastened to the tank.

Hope this helps.

Bob Garner
-----Original Message-----
From: Acie Chance [mailto:achance(--nospam--at)lacsd.org]
Sent: Monday, February 07, 2005 1:48 PM
To: seaint(--nospam--at)seaint.org
Subject: Cable Tie Down for FRP Tanks



    I am checking the hold down of a Fiber Reinforced Plastic tank due to
wind and seismic.  Using free body diagrams I get twice the tension in the
cables as the original engineer did.  I know this method is used on a
regular basis but I have not been able to find the method explained.  If any
one has a book or other document with the  method explained and/or a worked
out example they could e-mail or fax to me it would be helpful.  The
calculation I am checking is mostly a spreadsheet with results and few
formulas.
   I am not sure everyone on the list is interested in this problem so my
fax number is (562) 908-4270 and my e-mail address is achance(--nospam--at)lacsd.org.

Thanks
Acie Chance

PS  I do not want to hear about bad spelling and grammar.


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