Ted
 As a side note, There is a soil structure interaction to be considered on
larger buildings. The tail can partially wag the dog.
Regards
Barry


Doug Crice wrote:

> ted@.......... wrote:
> >
> >> The question is, should you put the strong motion sensor in the attic so
> > less of the house will fall on it?
> >
>
> I'm relatively sure you're speaking tounge-in-cheek, but your first
> strong-motion sensor should be placed on solid (or what passes for solid
> in your area) ground.  If you put the sensor in the structure,
> especially the attic, it will record the natural resonances of the
> building, not the ground spectra which are of interest to structural
> engineers and microzonation enthusiasts.
>
> Large high rise buildings typically have at least three strong-motion
> seismographs, one in the basement, one in the roof and one in the
> middle, wired together with a common time base.  The purpose is of
> course to record the driving force in the basement and the structural
> response of the building to the shaking.  It's a tool for better
> aseismic design of structures.
>


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