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Masonry on wood

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Title: Masonry on wood

I suppose I should flip through the IBC and read everything with a heavy black line beside the week the new code comes out.  As it is, though, I find these things gradually (and often with the help of this listthanks).

My understanding of IBC 2104.1.6 and the new IBC 2304.12 (which now seem to contradict each other for the most part) is that a lot of stuff that was not previously allowed now is, if you use a duration factor of 0.9 for wood supporting members.  For example, you could have a hollow-core concrete floor in a light-framed building.  Interesting.  Am I reading this right?  Why in the masonry section do they not get more explicit with deflection limits, the way they do in the glazing section, if this is so?  It defaults to ACI 530, 1.10, which I take to mean DL+LL defl < l/600 or 0.3 as a max, but otherwise reduced to the actual calculated deflection of the masonry above.


Gordon Goodell

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