If it isn't, there can be a code-required increase in the earthquake design level of the building of up to 50 percent. This requirement affects not only the length of shear walls, etc., ...
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Huge Pendulum in Skyscraper Protected It When Epic Earthquake StruckThe earthquake, the strongest in 25 years ... Other approaches include diagonal braces between floors, shear walls that take the brunt of the forces, and dampers that physically reduce vibrations.
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