Mode shape
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When a structure vibrates it oscillates according to some forms (infinite modes), which can be compared to some modes (known as fundamental modes). The first three modes are generally the most important, as they most stress the structure; they are the two flexional modes (along two directions, orthogonal to each other) and the third torsional mode. It is important to know a building’s way of oscillation because it lets one understand whether or not the structure was well-designed.
by Strago srl - Pozzuoli (NA), Italy
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