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Re: "dynamic analysis" for earthquake ?

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On Jun 7, 2005, at 12:54 PM, C.G. Construcciones, C.A. wrote:

When the frequency of  the loading is near the frequency of the structure, we have a special case very dangerous: the resonance, were without damping, the loads can go to infinite.
I phrased that badly. I should have said same order of magnitude. Earthquakes rarely cause actual resonance because the excitation is randomly phased--it usually takes about 10 cycles of the same frequency to drive a structure to resonance.
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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