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Re: Light Pole Failure

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Steve,
You should try contacting Dr. Jay Puckett at the University of Wyoming.  He
has performed research into the dynamic behavior of light poles subjected to
high wind loads for the State of Wyoming.  Good luck.
Kit Badger
----- Original Message -----
From: "Steve Hiner" <shiner(--nospam--at)folsom.ca.us>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, February 07, 2002 5:34 PM
Subject: Light Pole Failure


> Two light pole failures in the last three years ... doesn't sound like
many,
> but the failure mechanism is of some concern.
>
> Central California - 75 mph design wind speed
> Some strong winds occurred several months back (40-50 mph gusts)
> (Poles did not fail/drop during those storms)
>
> 30' tall poles with light standard (about 3 years old)
> 5" square steel tubes, 1/8" thickness (material spec - not sure)
> 12" +/- x 1" thick square base plate w/ 4 anchor bolts
> The base plates have 5" square holes such that the tube slides within the
> base plate thickness
> Fillet welds - all around (3/16" or 1/4"? +/-) at top of base plate to
tube
> AND at bottom edge of tube to 5" square slotted edge of base plate.
>
> Failure has occurred in the steel tube just above the fillet weld between
> the top of base plate and the tube section.
>
> Would be interested to hear some opinions or from those who may have
> experience with similar failures.
>
> You can also contact me personally at shiner(--nospam--at)folsom.ca.us
>
> Regards,
> Steven T. Hiner, SE
>
>
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