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Re: Rigid diaph. analysis with diagonal walls

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This is actually a code requirement for plan irregularity for non-parallel systems.

Why not just detach the wall from the diaphragm? Do you really need it?


On Thu, Mar 13, 2008 at 9:15 AM, David Merrick <MRKGP(--nospam--at)> wrote:

IF    a skewed wall is analyzed by resolving each diagonal wall into
equivalent X and Y length walls,
THEN    the resulting error can be as much as 30%.
This method should only be used by adding 30% of the Y forces to the X
forces and, visa versa.
in other words
By using 100% shear plus 30% of shear affects from the perpendicular

Know the method of your program.

Skewed wall stiffness in the direction of the base shear varies with the
stiffnesses of walls perpendicular to that base shear direction.

All skewed wall stiffnesses reduce in the X direction when  any one
non-skewed wall, in the Y direction is reduced.

I wonder how the seminar by-Gosh for skewed walls worked out? Was it not
given in the East Bay area near San Francisco?

David Merrick, Structural Engineer
WEIGHT, Conserves Energy, reduces noise and PROTECTS.

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