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Re: Building Separation

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But wouldn't the "upstream" house be hit first by the seismic wave, and thus the 4 structures would NOT "sway in phase"? 

I recall seeing a row of trees alongside a street whip laterally in sequence in a 6.5 earthquake.

Ralph Hueston Kratz, S.E.
Structural Engineer
Richmond CA USA

In a message dated 7/28/05 2:57:11 PM, medeardorff(--nospam--at) writes:
I am being accused of being too conservative and I need a reality check. I
have a group of four identical row homes with a two inch separation between
them. Being identical I believe I can assume them to have identical dynamic
properties but the Delta sub MT value would seem to require a greater

My client pointed out to me that they built a similar project where the two
inch separation wasn't questioned. I note that there is an exception which
might apply here since the buildings will probably sway in phase.