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RE: Alternate Wind Provision

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Joe, and Ben,


I do agree with you.  The presenter does state: “…wind loads are transmitted through rigid floor and roof diaphragms”. His criteria wasn’t the need for a “rigid”  building and I agree they are not the same.  I’m not sure why he made the statement that the loads had to be transmitted through rigid floor and roof diaphragms.  I dug out my copy of the slides to make sure and that is what he states.


All in all it was a pretty good, but short, seminar.




From: Jnapd(--nospam--at) [mailto:Jnapd(--nospam--at)]
Sent: Tuesday, April 29, 2008 1:43 PM
To: seaint(--nospam--at)
Subject: Re: Alternate Wind Provision




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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