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Out-of-plane Seismic force on walls

Out-of-plane Seismic force on walls

Out-of-plane Seismic force on walls

(OP)
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.

RE: Out-of-plane Seismic force on walls

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.

RE: Out-of-plane Seismic force on walls

C. Cantilever reaction

A & C if we are talking about the design of the anchorage of wall itself.
 

RE: Out-of-plane Seismic force on walls

C. Assuming there is a parapet?

RE: Out-of-plane Seismic force on walls

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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