What is the meaning torsion of structure when it is at first mode ? please explain...

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Civil Engineering

What is the meaning torsion of structure when it is at firstmode ? please explain detailedly.

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The deformed shape of the building associated with oscillation at fundamental natural period is termed its first mode shape Similarly the deformed shapes associated with oscillations at second third and other higher natural periods are called second mode shape third mode shape and so on respectively There are three basic modes of oscillation namely pure translational along Xdirection pure    See Answer
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