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Re: Light Pole Failure

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This thread made me wonder what kind of wind speeds on signs and poles
result from truck traffic on a highway.  Especially those signs that look to
be only about 6" above the top of the truck that is going 80 mph.  I wonder
if the design takes this into account (many more trucks going by than heavy
wind storms = possible different fatigue situation than was considered in
design?)
Ken


Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail: kpeoples(--nospam--at)lvta.net

----- Original Message -----
From: "Steve Hiner" <shiner(--nospam--at)folsom.ca.us>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, February 07, 2002 7:34 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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