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Re: mass vs vibration

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On Jul 27, 2006, at 5:21 PM, <William.Sherman(--nospam--at)> wrote:

"The concept of this method is to provide sufficient mass in the
foundation block so that the vibration waves are attenuated and absorbed
by the block and soil system."
What they seem to be talking about is taking advantage of radiation damping into the foundation. This does absorb energy. But the added mass isn't sprung; if it were the system frequency would indeed be lowered.
Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw(--nospam--at)   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)

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