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Simplified base shear formula in 97 UBC

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As we are still using UBC97 based code in California for fairly simple
wood building one can use the simplified base shear eqaution
V=3.0*Ca*I*W/R.  It gives you base shears of 20% higher than the general
base shear eqautions(or may be slightly less if Na=1.3 is used near a
seismic fault).  By using this approach, one can assume a uniform
vertical shear distribution within a building and can use a flexible
diaphragm assumption.


Alexander (Sasha) Itsekson, SE
Enginious Structures, Inc.
Oakland, CA

Subject: RE: shear wall program
From: "Jason Christensen" <jason.christensen(--nospam--at)>
To: <seaint(--nospam--at)>

"The 20% increase in base shear is a good investment as far as I am
concerned anyway for buildings in high seismic areas."

What increase is this?


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