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RE: rho

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Assuming the following elevations for a two story building:
Level 1:   0' (Ground)
Level 2: 10'
Roof:     20'
2/3(Height) = 0.67(20') = 13.3'
Of the two elevated decks, Level 2 and Roof, only Level 2 is at or below the 2/3 point.  Hence, I would look at rho based on Level 2 only and not the Roof level.  Of course, if something noteworthy was happening in the structural layout at the Roof, I might look at it there, too, but I don't think the code requires it. 
Paul Crocker, P.E.
-----Original Message-----
From: Mark Baker [mailto:shake4bake(--nospam--at)]
Sent: Wednesday, December 12, 2001 2:48 PM
To: seaint(--nospam--at)
Subject: rho

Seems we revisit this issue every couple months in our office...
Calculating rmax for rho:
rmax is defined as "the largest of the element story shear ratios which occurs in any of the story levels AT OR BELOW the 2/3 height level of the building".
In a 2 story building, "AT OR BELOW the 2/3 height level of the building" would lead one to calculate r at 2nd floor and 1st floor.
Agree or disagree?