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Re: Diaphragm shears

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Thank you for responding Michael,

<The diaphragm and connection to the vertical element should be designed for
the higher diaphragm shear values..... A minimum design force limit is
provided in the code for  diaphragm attachment, as will as a maximum design
force which by code you need not exceed, >

The above I am clear on.

<you have reduced the expected lateral forces (seismic) by the Rw value and
you are depending upon the ductility of the lateral resisting system to
resist the
true lateral forces>

So... we are calculating diaphragm forces for higher mode responses solely
for the purpose of ensuring connection integrity and proper distribution of
loads, the intent of the UBC is not to design the vertical element for this

Thanks again,

Mark D. Baker
Baker Engineering