Hello,
there are obviously different soil types – from hard rock to loose clay. Why do the forces, an engineer has to consider for his buildings, depend on it?
I understood that there is a response spectrum and e.g tall buildings got a lower eigenfrequency than lower. But I saw, that there are different response spectra for each soil type.
Why does it make a difference?
In: 2
Except for rock, the ground is usually not solid. In fact, at the right period of shaking, most ground types assume at least some qualities of a liquid and tend to resonate.
Rock resonates at much less destructive frequencies.
Gravel tends to dampen the effect. Clay and wet sand magnify it. The degree to which you expect surrounding ground to resonate determines how deep your foundation must be.
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