Uplift Wind Loading Values [RE-wrenches]

[matthew tritt]

One up-lifting thought would be to contact the supplier of the rack system.
They have all the load calcs available since many agencies require
engineering information. I know that the guys at Unirac figure loads
according to the maximum winds for a given geographical location.

Matt T
----- Original Message -----
From: "ASAP POWER!" <asap at podnine.com>
To: <RE-wrenches at topica.com>
Sent: Wednesday, March 19, 2003 7:29 AM
Subject: Uplift Wind Loading Values [RE-wrenches]


> Wrenches,
> Does anyone have good info on how to obtain measures?  As late as 2001, my
> brief research has shown that even ASCE standards have not come up with
any
> reasonable method for what could be called similar structures.
>
> To quote a Clemson University study entitled Wind Uplift Forces on Roof
> Canopies, found online:  "Building designers in the United States
frequently
> have to determine wind loads for the design of free standing canopy roofs,
> porches, building entryway covers or other exposed or partially exposed
roof
> structures. To date, the American Society of Civil Engineers Standard,
ASCE
> 7, has not specifically provided guidance to estimating wind loads on
these
> structures. Other codes and standards such as the Australian Standard, the
> British Code of Practice and the Euro Code have provided wind load
> information for these structures. "
>
> This is a request from an inspector for a small flush mounted array
install
> on a south facing tile roof using tile-trac system, just in plan check.
> It's the first time I've ever even been asked to provide this information
> for a flush mounted roof array.  Have others?  He also wanted details of
> array support on the tile-trac system.  Are there any guidelines for
> roof-mounted or canopied arrays concerning wind uplift calculations,
> specifically from our industry?  Or are we just discussing the size of the
> lag bolt and the type of wood in the roof trussing?
>
> I believe if we all think uplifting thoughts the load will be reduced.
> Especially today.
>
> PD
> ASAP POWER!
>
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