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RE: rho

• To: seaint(--nospam--at)seaint.org
• Subject: RE: rho
• From: "Dave Evans" <DEvans(--nospam--at)tnh-inc.com>
• Date: Thu, 13 Dec 2001 11:59:29 -0900
• Priority: normal

```Paul, check out the 1999 Blue Book commentary page 102 last
paragraph for a different interpretation, and note the crucial
difference between the words "story" and "level" in this issue.

Dave Evans, P.E.

From:           	Paul Crocker <paulc(--nospam--at)ckcps.com>
To:             	"'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject:        	RE: rho
Date sent:      	Thu, 13 Dec 2001 09:45:19 -0800
Organization:   	http://www.seaint.org

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-----
Sent: Wednesday, December 12, 2001 2:48 PM
To: seaint(--nospam--at)seaint.org
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?

TIA
Mark

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