Need a book? Engineering books recommendations...

# Re: Rigid Diaphragm Analysis for Plywood Shear Walls

• To: RShreenan(--nospam--at)AOL.COM, seaint(--nospam--at)seaint.org
• Subject: Re: Rigid Diaphragm Analysis for Plywood Shear Walls
• From: Seaintonln(--nospam--at)AOL.COM
• Date: Mon, 27 Sep 1999 14:15:51 EDT

```I might be wrong on this one, and possibly Mike Brooks can clarify this, but
the rigid analysis in the Enercalc library is not writting specifically for
concrete or masonry but is a general analysis program that assumes only the
rigidity of diaphragm. The user defines the Modulus of Elasticity of the
walls and the thickness of the wall. If the User inputs unity as the E and t
values, the program assumes the same materials and distributes the shear from
torsion by the stiffness of the walls based upon their heights and lengths.
This program, in my opinion, is not material specific and can be used very
well for diaprhgms supported by wood walls. If anyone has any other
knowledge, please explain to me what I am missing here.

Dennis S. Wish PE

In a message dated 9/26/1999 2:31:30 PM Pacific Daylight Time,
RShreenan(--nospam--at)aol.com writes:

<< Enercalc has a
program for rigid diaphragms for concrete or masonry walls that I believe
could be adapted for use with plywood shear panels.  If there was a good
user-friendly program for calculating plywood shear wall deflections, then
the plywood shear panels (assumed first trial) could be loaded with the same
load, say 2 to 5K and the deflections noted for each panel.  The inverse of
these deflections could be normalized and treated as relative rigidities and
used in the Enercalc program for purposes of distributing the shear from the
"rigid" plywood diaphragm.  This part of it is fairly simple once the panels
are located on the coordinate grid.  It is the shear panel deflection calcs
that are difficult and time consuming. >>

```