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[SEAOC] Re: [SEAOC] Wind Pressure Coefficients (Cq)[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Re: [SEAOC] Wind Pressure Coefficients (Cq)
- From: nmoore(--nospam--at)spider.lloyd.com (Neil Moore)
- Date: Sat, 10 Aug 1996 14:08:55 -0700 (PDT)
Brad: The "Wind Commentary to the UBC" by the Structural Engineers Association of Washington can answer your questions. Per page 170: (1991 edition) "....wind loads on an open frame tower are based on the normal projected area of the members located on one of the sides of the tower no matter what the wind direction. The plane on which the area is projected is a vertical plane that is parallel to one side of the tower. The UBC provides two Cq factors: a value of 3.6 for winds normal to a side and 4.0 for winds along a diagonal Each of the Cq factors is adjusted to account for the wind drag against the tower members on the other sides of the tower. When the wind direction is along a diagonal the same projected area as calculated for the normal winds is used the Cq factor is increase from 3.6 to 4.0 to account for the greater area of the members actually directly exposed to the wind."....... The SEAOW commentary also discusses the ANSI/EIA 222E (now 222F) standards, which is recognized as a standard by Section 1603.2 of the UBC and they comment that this is more appropriate code for tower structures than the UBC. Neil Moore S.E. ...
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