There are no sections in the code that specifically exempt the diaphragm
from application of Rho. However, if you look at 1630.1.1 under definition
of Eh (which Rho gets applied to) it refers to earthquake loads as set forth
in 1630.2 and 1632. The provisions for diaphragm design are in 1633.2.9.
Therefore, I would conclude that Rho need not be applied to the diaphragm.
Ben Yousefi, SE
San Jose, CA
From: Mark Swingle [SMTP:mswingle(--nospam--at)earthlink.net]
Sent: Sunday, January 14, 1996 7:20 AM
Subject: Rho for diaphragms
The Seismic Design Manual states in at least three places that rho
does not apply to diaphragms. Unfortunately no code reference is
given for any of these three notations.
Can anyone cite the CODE reference (97 UBC) where this is stated?
thanks in advance
Mark Swingle, SE