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Re: A little help, please!

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It says "permissible" so I understand that you can use the 2 times the
drift criteria as long as this diaphragm deflection amount does not
exceed the permissible deflection of the attached elements, so
therefore I don't think it is contradictory.


On Wed, Jun 11, 2008 at 2:18 PM,  <ECVAl3(--nospam--at)> wrote:
> I'm a bit confused. Could someone clarify this for me, please.
> The IBC Section 2305.2.1 states: "Wood diaphragms are permitted to be used
> to resist horizontal forces
>  provided the deflection in the plane of the diaphragm, as determined by
> calculations..., does not exceed the permissible deflection of attached
> distributing or resisting elements..."
> But the ASCE Section Calculated Flexible Diaphragm Condition,
> states: "Diaphragms...are permitted to be idealized as flexible where the
> computed maximum in-plane more than 2 times the average story
> drift of adjoining vertical elements of the seismic force-resisting
> system..."
> Are these contradictory requirements or am I reading them wrong?
> S.Macie. P.E.
> ________________________________
> Vote for your city's best dining and nightlife. City's Best 2008.

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