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Out-of-plane Seismic force on walls

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AlienMonkey

Structural
Jan 16, 2007
16
In determining the out-of-plane seismic reaction to the diaphragm, do you consider the inertial wall force due to

A: the full height of the wall

B: the height tributary to the diaphragm.

For simplicity consider a single story structure.

I've seen it calculated both ways with the latter being based on a lumped mass model.
 
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I think it should be based on the height tributary to the diaphragm if there is a attachment that can transfer force at the base.

 
C. Cantilever reaction

A & C if we are talking about the design of the anchorage of wall itself.
 
I have seen engineers not increase the load to the diaphragm when there is a parapet condition. They have used the tributary area of the wall to the diaphragm, not the cantilever reaction, as they should. Reading the OP again are you talking about out-of-plane reaction or including wall weight in seismic calculations?
 
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