] [Thread] [Date] [Author]

[Christopher Wright <chrisw(--nospam--at)skypoint.com>]

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)skypoint.com   | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 
1864)
http://www.skypoint.com/~chrisw/


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ********