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RE: 1997 UCBC Section A506.3 Development of Anchor Loads into Diaphragm

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Dear Marlou,

The 'rocking' action I believe refers to the overturning of the wall that
may exist at the reentrant corner.  The wall either a collector (or drag
strut depending on weather from Ncal or Scal ). However the diaphragm chord
has been cut and therefore requires a new chord.  The new chord portion will
look very much like the strut or collector.  The design force is the larger
of the two conditions the rocking of the shearwall or tension compression
transfer of the diaphragm chord.

Kenneth Tarlow,SE

-----Original Message-----
From: Rodriguez, Marlou [mailto:mrodriguez(--nospam--at)]
Sent: Wednesday, March 14, 2001 5:39 PM
To: 'SEAINT Newslist'
Subject: 1997 UCBC Section A506.3 Development of Anchor Loads into Diaphragm

1997 UCBC Section A506.3 "Development of Anchor Loads into the Diaphragm"
last paragraph states:

...At re-entrant corners where continuity collectors do not exist, they
shall be provided.  New collectors shall be designed to the capacity
required to develop into the diaphragm of a force equal to the lesser of the
rocking or shear capacity of the re-entrant wall, or the tributary shear.

Can any direct me on how to correctly calculate the "rocking" of a
re-entrant corner wall.  I can't seem to find any example or direction


Marlou B. Rodriguez
Biggs Cardossa Associates Inc.
Structural Engineers
1871 The Alameda, Suite 200
San Jose, California 95126
408-296-5515 Fax 408-296-8114

Note:  The opinions that I write are my opinions and
are not necessarily the opinions of BCA or projects
associated with BCA.