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Re: stacked joist members

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It may be worth considering that either the pieces are trivially connected with fasteners, or are acting compositely though friction under low loads. Once static friction between the members is overcome or the fasteners exceed their actual shear limit, the members will act individually, and you'll get a sudden drop in stiffness (well, probably a series of drops). Not saying that this is the case, but it could be that even if the floor feels stiff, it may not be enough to presume that the floor members are connected sufficiently to transfer full load shear.


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