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RE: Seismic Deflection Criteria for "Penthouses"

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Doug –

 

Thanks for your response, but I was looking more for a code interpretation rather than an opinion on behavior.

 

Regards,

 

T. William (Bill) Allen, S.E.

ALLEN DESIGNS

Consulting Structural Engineers

 

<snip>
The roof is normally the last part of a structure to fail and in 90% of building collapse the roof does not fail, at all. The higher you are in the building, the less weight above you...the less weight above you the smaller the applied force..the less the applied force the larger the voids..this is why bottom floors are squashed with 0-2% survivability and the top floors have 90% survivability.

 

This can vary if the frequency of the waves are more in tune with the top floors. This is a rare occurrence.

 

doug copp