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Re: Building Separation

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On Jul 28, 2005, at 4:58 PM, Mark E. Deardorff wrote:

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
separation.
Not necessarily the case, unless you have identical live and dead load in all four at the time of the quake, and the foundation stiffness is equal. A 5% difference in frequency response plus any shielding effect from one of the buildings, will give you this 5% difference in response without any trouble. And don't forget--these buildings were designed identically, not built identically.

Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/~chrisw/


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