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<p>useful tools of <a href="page.php?w=earthquake_engineering">earthquake engineering</a> for analyzing the performance of <a href="page.php?w=structures">structures</a> and equipment in earthquakes, since many behave principally as simple <a href="page.php?w=oscillator">oscillator</a>s (also known as <a href="page.php?w=single_degree_of_freedom">single degree of freedom</a> systems).  Thus, if you can find out the <a href="page.php?w=natural_frequency">natural frequency</a> of the structure, then the peak response of the building can be estimated</p><p>
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