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Re: wind gust response

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ASCE 7 defines a structure with a lowest natural frequency less than 
1 Hz (period > 1 second) as flexible.  For this class of structure, 
the dynamic response to wind can be significant for both safety 
(dynamic amplification of response) and serviceability (perception 
of motion).  Some guidance for such structures is provided in ASCE 7 
and the National Building Code of Canada.  However, the most common 
(and generally best) approach is to have wind tunnel testing 
performed.

> From:          "Aya-Welland, Ruben A." <RAyaWelland(--nospam--at)tt-cbm.com>
> To:            "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
> Subject:       wind gust response
> Date:          Mon, 27 Sep 1999 16:14:24 -0500
> Reply-to:      seaint(--nospam--at)seaint.org
> Organization:  http://www.seaint.org

> > I have a question:
> > 
> > I have a building whose preliminary fundamental frequency is rather high
> > (about 5.5 seconds for a 30 story building). I am concerned that under
> > wind loading (no seismic zone) this arrangement will see some undesirable
> > dynamic response --- in terms of wind gust response...not life-safety
> > issues, but rather, issues of comfort. It is a residential tower. The
> > drifts are not outrageous --- it is more of an issue where the lateral
> > system CR is quite eccentric to the building CM.

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Michael Valley                                   E-mail: mtv(--nospam--at)skilling.com
Skilling Ward Magnusson Barkshire Inc.                  Tel:(206)292-1200
1301 Fifth Ave, #3200,  Seattle  WA 98101-2699          Fax:        -1201