While it's fairly accurate that heavy rigid support structures cannot be "moved or rocked by hand," the problem arises in the way seismic vibrations manifest themselves - by moving the entire building, not only up and down and side to side but also in the rotational directions. Hel-loo! For this reason even very rigid and heavy support systems can be easily moved by the seismic type vibration. As I mentioned earlier the effectiveness of isolation is actually a function of the ease with which the component can be moved in the direction of interest. Counterintuitive, eh?
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- 22 posts total
- 22 posts total