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Seismic Structural Seperation

Seismic Structural Seperation

Seismic Structural Seperation

(OP)
A quick question for the seismically inclined out there. I'm getting started on a structurally isolated addition to a building in SDC D. I am familiar with the square root combination of inelastic displacements to establish separation distances. Unfortunately, I don't have the design calculations from the original building so I'm not sure what it's displacements are, and if possible I'd rather not attempt an analysis of the existing building. Is there an acceptable, assumed displacement value that can be used for existing structures? If so, can you point me to the document that lists it?

Thanks for the help!

RE: Seismic Structural Seperation

Use the maximum allowable drift for the existing building type, ASCE Table 12.12-1.

RE: Seismic Structural Seperation

(OP)
I suppose the best answers are often the most obvious. Thanks for the reply, sandman. This helps a lot.

RE: Seismic Structural Seperation

No problem, I have done a few existing projects.

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