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Re: Quick/Easy Question for Seismic List

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I think you should multiply it with " floor to floor height" instead of
building height.

DI

"Ritter, Mike" wrote:

> Colleagues,
>
> Please help me with a quick question.  I am looking at some calcs
> prepared by another engineer, who calculated the allowable story drift
> for a three story building from BOCA and ran the number based on story
> height in inches.  In other words, the building height is 74', but he
> used 888 inches.  This gives the allowable story drift to be
> 0.02(888")=17.76".
>
> I've always used the story height in feet, which would give an allowable
> drift of about 1.48".  I was going to show my colleage the code section
> which says story height is in feet, but could not find it in BOCA, UBC,
> SBC, Farzad Naiem, or any other text books.  Does anybody have a
> reference section showing that the story height, by definition, should
> be in feet?  I know it must be there, but I'm in a rush and can't find
> it.
>
> Thanks again for the help!
>
> Michael Ritter, PE
>