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Re: Alternate Wind Provision

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I disagree with the instructor of that class.  A typical residence at 30 tall.   Ta = .02 x 30^.75 = .25 sec
                                                                                                               f= 1/.25  = 4 hz
                                                                                                   therefore Rigid per definitionin ASCE-07
Rigid for Wind and Rigid roof and floor Diaphragms are totally different and he is probably confusing the issue.
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA

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