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
Different soil provides different amounts of dampening of the vibrations. Imagine standing in the back of a pickup truck as it goes over a bumpy road. Now imagine standing on 2 mattresses in the back of the truck as it goes over the same bumps. Would it feel the same to you, or would it feel at least somewhat different because you’re now standing on something that can compress and absorb vibrations?
Loose soil can also move, compress, and absorb vibrations more than compact or rocky soil can. That changes the vibrations felt by the building, and therefore the stresses on the structure.
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