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Re: big dig structural failure - epoxy anchors overhead supporting gravity

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On Jul 16, 2006, at 12:59 AM, Robert Kazanjy wrote:

The reason (I think)  why it worked was the mass was increased to the point where the mass intertial effects were so large that the input forces had little effect.
Probably not noticeable compared to the overall deformation and migth reduce the natural frequency below the point where the diver's bouncing is way above the system frequency so there isn't much dynamic response. The effect would look like 'damping' but it isn't. Bounce at the right frequency and things will really start movin' and shakin.'
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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